JLK 6mm 105 Bullets

[efoleyjr]

Anybody shooting JLK 105g 6mm bullets in a Dasher? What has your experience been with them and what load are you shooting? My 1st test with them showed reduced velocity from what I got with Berger 105 Hy's and pressure ring Dia. was 0.0003" smaller than B105's.
Ed

 

[BIG D]

Anybody shooting JLK 105g 6mm bullets in a Dasher? What has your experience been with them and what load are you shooting? My 1st test with them showed reduced velocity from what I got with Berger 105 Hy's and pressure ring Dia. was 0.0003" smaller than B105's.
Ed

I’m not shooting in a dasher but I have been playing with them lately in my 6BRX and I noticed today that the JLK 105 will run 90 -100 FPS faster than the 105 Berger vld with the exact same charge of varget. I don’t have any hybrids here to compare with. I’m having a tough time deciding on coal. The test I ran yesterday showed that in this barrel they didn’t want to be jammed. At lands tested out to -.045 they shoot well. Some a bit tighter than others. I’m shooting 2 matches tomorrow at 300. I’ll see how they do at -.025. They shot 1/2” 5 shot groups today at 300. That’s outside to outside. At -.030 I had the best es and sd but the group was a little bigger. Weather here in wisconsin today was switching winds and I think it may have got the -.030 group. No flags here. They show promise. I dropped from 33.30 varget down to 32.70 to get in a nice node on the ladder test and these are running 3020 from 29“ krieger 7.5 twist.

 

[dbduff]

I’m not shooting in a dasher but I have been playing with them lately in my 6BRX and I noticed today that the JLK 105 will run 90 -100 FPS faster than the 105 Berger vld with the exact same charge of varget. I don’t have any hybrids here to compare with. I’m having a tough time deciding on coal. The test I ran yesterday showed that in this barrel they didn’t want to be jammed. At lands tested out to -.045 they shoot well. Some a bit tighter than others. I’m shooting 2 matches tomorrow at 300. I’ll see how they do at -.025. They shot 1/2” 5 shot groups today at 300. That’s outside to outside. At -.030 I had the best es and sd but the group was a little bigger. Weather here in wisconsin today was switching winds and I think it may have got the -.030 group. No flags here. They show promise. I dropped from 33.30 varget down to 32.70 to get in a nice node on the ladder test and these are running 3020 from 29“ krieger 7.5 twist.

Watching this. New or Swampy’s 105s? I’m playing with older 105s in a dasher but finding luck around 2980-90. Temps her in NNY around 10-15 degreesF in am. Shooting 300, 3/4 to 1 1/4 5 shot groups, sd around 12/5 shots.
D

 

[BIG D]

Watching this. New or Swampy’s 105s? I’m playing with older 105s in a dasher but finding luck around 2980-90. Temps her in NNY around 10-15 degreesF in am. Shooting 300, 3/4 to 1 1/4 5 shot groups, sd around 12/5 shots.
D

I’m not sure if these were some of swampies stock or if these Ed made. Definitely shooting well. This testing is off of bipod and rear bag on my bench.

 

[efoleyjr]

I’m not sure if these were some of swampies stock or if these Ed made. Definitely shooting well. This testing is off of bipod and rear bag on my bench.

Big D & dbduff
I am a sling shooter and shoot 600 and 1000. Just started shooting the "new JLK" 105's in a Benchmark 7.75 twist at 29" and compared to B105 Hy they are about 10-12 fps slower with 32.9g of Varget. Ladder testing, seating, yesterday at 600 found a nice node at 0.055"-0.070" jump which produced a vertical change of 0.89" over this range using 33.1g of Varget. This test was done 2 different times and produced the same results. I am using Alpha brass and Wolf SRM primers. Next week I will being using 0.055" jump and testing powder charge. Velocity at 33.1 Varget was 2976 fps. Weather here in east TN. yesterday was 45* with 2-3 mph winds, next week we will be in the upper 50's.

 

[BIG D]

Big D & dbduff
I am a sling shooter and shoot 600 and 1000. Just started shooting the "new JLK" 105's in a Benchmark 7.75 twist at 29" and compared to B105 Hy they are about 10-12 fps slower with 32.9g of Varget. Ladder testing, seating, yesterday at 600 found a nice node at 0.055"-0.070" jump which produced a vertical change of 0.89" over this range using 33.1g of Varget. This test was done 2 different times and produced the same results. I am using Alpha brass and Wolf SRM primers. Next week I will being using 0.055" jump and testing powder charge. Velocity at 33.1 Varget was 2976 fps. Weather here in east TN. yesterday was 45* with 2-3 mph winds, next week we will be in the upper 50's.

Well, today was the day to know if I’d found the correct load. I shot at a small target MR31 At 300 yards. Shot 2 197s and placed third. This gun is fairly new to me. My SDs were 13.9 and 9.3 for 20 shots/ match. I’ll try playing with more jump. So far I’m happy with the way it shoots. Not sure if its Indian or arrow at this point. More tests this week. This barrel is getting a little long in the tooth. I do have a tuner on it I haven’t messed with yet. This week I will start with seating with more jump. Then start cranking on tuner. If that doesn’t show results I am after I will chamber and install a new 1-8 Brux 30” and put the tuner on that. Kinda nice having a lathe and a backyard range. even nicer haing components to load and test.

 

[efoleyjr]

Big D,
Do you mean you shot on the 600 yd reduced to 100 yd target at 300 yds? The way i determined the best seating depth was to shoot a series of shots with seating depth ranging from 0.030" to 0.095" jump from 0 CBTO in 0.005" steps, one shot each and known good powder charge and using the same aim point. Then repeat the same test. You will find a point in the string that there is very little change in elevation for 3 to 4 consecutive shots. That is the seating depth that you want to start doing more testing as it is the most forgiving range to seat to. When happy you have found the right seating depth refine the load by changing powder charge. I tend to find seating depths in the 0.050" to 0.075" work well and some find seating depths out to 0.140". I know it sounds nuts but try it.
Ed

 

[BIG D]

Big D,
Do you mean you shot on the 600 yd reduced to 100 yd target at 300 yds? The way i determined the best seating depth was to shoot a series of shots with seating depth ranging from 0.030" to 0.095" jump from 0 CBTO in 0.005" steps, one shot each and known good powder charge and using the same aim point. Then repeat the same test. You will find a point in the string that there is very little change in elevation for 3 to 4 consecutive shots. That is the seating depth that you want to start doing more testing as it is the most forgiving range to seat to. When happy you have found the right seating depth refine the load by changing powder charge. I tend to find seating depths in the 0.050" to 0.075" work well and some find seating depths out to 0.140". I know it sounds nuts but try it.
Ed

Yes Ed that is correct. 100 yard MR 31 target shot at 300 yards. I’ll try your method of madness once. Thanks for advice.

 

[dbduff]

Big D,
Do you mean you shot on the 600 yd reduced to 100 yd target at 300 yds? The way i determined the best seating depth was to shoot a series of shots with seating depth ranging from 0.030" to 0.095" jump from 0 CBTO in 0.005" steps, one shot each and known good powder charge and using the same aim point. Then repeat the same test. You will find a point in the string that there is very little change in elevation for 3 to 4 consecutive shots. That is the seating depth that you want to start doing more testing as it is the most forgiving range to seat to. When happy you have found the right seating depth refine the load by changing powder charge. I tend to find seating depths in the 0.050" to 0.075" work well and some find seating depths out to 0.140". I know it sounds nuts but try it.
Ed

Will give it a try. Using Cci 450.

 

[dbduff]

Yes Ed that is correct. 100 yard MR 31 target shot at 300 yards. I’ll try your method of madness once. Thanks for advice.

Turned around and went into rifling, got better groups. Tried backing out, didn’t improve as much as going in. Loosened the neck tension to let rifling define the touch point, that was the a ha moment. Dramatic improvement in ES and group size.

 

[BIG D]

Turned around and went into rifling, got better groups. Tried backing out, didn’t improve as much as going in. Loosened the neck tension to let rifling define the touch point, that was the a ha moment. Dramatic improvement in ES and group size.

I’m actually going to go out today with less neck tension and do another seating test. I’m going back to my old 33.3 load because it also was in the cluster from 32.4-33.6 in the ladder test. That was .30 jumps on powder charge. I had 5/8” vertical from 32.4-33.6 at 300 yards. the 33.0 load was the lowest of the cluster and it was 3/8” low from 32.4, 32.7, 33.30 and 33.6 I had the bullets righ at the lands .000. I don’t like to jamb whenever possible. I loaded up 32.7 to do seating test from .000 out to .045 off the lands. My lowest es/sd we’re at -.005 and -.030. Everything was shooting 3/4” for 5 shots. I’m going to go play with a seat test today to get lowest es/sd with 33.30 and then adjust tuner. This whole tuner thing is new to me and I really want to play since weather here in central wisconsin is way too nice not to be outside.

 

[dbduff]

I’m actually going to go out today with less neck tension and do another seating test. I’m going back to my old 33.3 load because it also was in the cluster from 32.4-33.6 in the ladder test. That was .30 jumps on powder charge. I had 5/8” vertical from 32.4-33.6 at 300 yards. the 33.0 load was the lowest of the cluster and it was 3/8” low from 32.4, 32.7, 33.30 and 33.6 I had the bullets righ at the lands .000. I don’t like to jamb whenever possible. I loaded up 32.7 to do seating test from .000 out to .045 off the lands. My lowest es/sd we’re at -.005 and -.030. Everything was shooting 3/4” for 5 shots. I’m going to go play with a seat test today to get lowest es/sd with 33.30 and then adjust tuner. This whole tuner thing is new to me and I really want to play since weather here in central wisconsin is way too nice not to be outside.

Sounds like you’ve got tight groups going. How much neck tension/size bushing are you using?

 

[efoleyjr]

Turned around and went into rifling, got better groups. Tried backing out, didn’t improve as much as going in. Loosened the neck tension to let rifling define the touch point, that was the a ha moment. Dramatic improvement in ES and group size.

Can you give us some numbers for seating length, ES &SD. Also neck tension to let bullet seat. Thanks

 

[dbduff]

Can you give us some numbers for seating length, ES &SD. Also neck tension to let bullet seat. Thanks

Send you my info in the am.

 

[BIG D]

Sounds like you’ve got tight groups going. How much neck tension/size bushing are you using?

I was running a .266 bushing and around.002 neck tension. I was checking seating pressure on a 21st century hydro arbor press and I had a good average around 22-24 but I’d get some pushing 40 and some around 5-10. But I chucked a 6.5 expander button in the lathe and now I’m almost spot on .001 neck tension while Running the .266 bushing and over the new expander. I’ve tried .267 bushing but I get some odd balls that won’t hold seating length. I don’t turn these necks so I run into that half thou issue. So I figured I’d size below and run my expander button. I dialed in a pretty good load today. Found -.010 and -.015 both shot pretty tight at 300. es/sd were both single digits at -.015. But -.010 shot tighter by 1/4” for 5 shots. My worst es was 17 and my worst sad was 10 from .000 to -.030. I think this neck tension will help be more consistent. I played with the tuner then at 100 and didn’t get it any better than where I was without it. Shot 3 shot groups at my “0” setting and at 6and 8 also looked good. I took it back to “0” and back to 300 yards. 3 shot were 3/8” A “0”. I tweaked slightly both side of that. One way climbed vertically and the other way widened. I’m thinking someplace around 6-8 could be the sweet spot. I think where I’m at is to narrow. More tomorrow if I can.

 

[6ShotsOr5?]

The results sound great, but are you seeing smaller groups than with the 105 VLD or hybrid Berger’s for example? Are these JLK’s sold anywhere else than the JLK web site? All their 6mm bullets are out of stock on their web site.

 

[BIG D]

The results sound great, but are you seeing smaller groups than with the 105 VLD or hybrid Berger’s for example? Are these JLK’s sold anywhere else than the JLK web site? All their 6mm bullets are out of stock on their web site.

I have been shooting Berger’s and Sierras. These JLK are way more consistent. I haven’t ran these at 600 yet. But they sure are consistent as far as sorting goes. JLK is a one man shop. Hard to keep up on orders. But worth the wait if you get an order in.

 

[dbduff]

I have been shooting Berger’s and Sierras. These JLK are way more consistent. I haven’t ran these at 600 yet. But they sure are consistent as far as sorting goes. JLK is a one man shop. Hard to keep up on orders. But worth the wait if you get an order in.

True that regarding JLK’s.

 

[dbduff]

Can you give us some numbers for seating length, ES &SD. Also neck tension to let bullet seat. Thanks

My loaded round (Dasher) is .263. I’m using a .262 bushing. Use a fired but unsized case and partially seat a bullet. Remove the firing pin from your bolt and then close the bolt on the unsized case and partially seated bullet. It will seat the bullet where the lands contact it. Now make sure you can extract the round without it sticking in the rifling. Do this two or three times, measuring c.o.a.l. Each time until you have consistent measurements. Start moving the bullet into the case (away from the lands) .003 for each test. I shot three shots at each succeeding .003 point. Fairly quickly you will see change in group size. When you find the group that suits your needs, be sure to measure that length. In my test I didn’t realize that my longest settings were actually being reset when I closed the bolt. This method was suggested by my gunsmith. So far (twice, yesterday and today) it has worked for me. YMMV. My SD was 16/8.2 and 3/1.7. Speeds with 105 JLK were 2991-2999. Hope this helps.
D

 

[efoleyjr]

My loaded round (Dasher) is .263. I’m using a .262 bushing. Use a fired but unsized case and partially seat a bullet. Remove the firing pin from your bolt and then close the bolt on the unsized case and partially seated bullet. It will seat the bullet where the lands contact it. Now make sure you can extract the round without it sticking in the rifling. Do this two or three times, measuring c.o.a.l. Each time until you have consistent measurements. Start moving the bullet into the case (away from the lands) .003 for each test. I shot three shots at each succeeding .003 point. Fairly quickly you will see change in group size. When you find the group that suits your needs, be sure to measure that length. In my test I didn’t realize that my longest settings were actually being reset when I closed the bolt. This method was suggested by my gunsmith. So far (twice, yesterday and today) it has worked for me. YMMV. My SD was 16/8.2 and 3/1.7. Speeds with 105 JLK were 2991-2999. Hope this helps.
D

Thanks for the info. I am using the Alex Wheeler method to find "touch" with the bullet which is very close to what you described. What I am most interested in is the group info and at what seating depth you maxed out at. Also how much groups changed with "X" adjustment. Thanks again.

Ed