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John708's Project has started

Folks:

I just finished chambering and rebarreling Jonh708's model 10 Savage to 6mm BRX. He has a finished 31 and 3/4 inch Broughton 1.200 to .750 barrel. Tim North did an excellent job with the 6mm 5C barrel. Dave Kiff at PT&G made him a first rate reamer and go and no-go gauges. I cut the top end out of a Redding sizing die for John to have a body die. John has bought top quality brass, bullets, primers, and powders. His tendon, threads, and chamber were cut throught the headstock, dialed in on both ends with a thenths indicator showing no indicator movement on either end. The chamber was cut using a highspeed flush system, with Rustlick 255R at 5:1, 50-70psi,at 105-175 RPMs, flushing every .030. The last .0030 that was cut .0010 flushed,x3), three times backed out .100 and flushed at 75 psi. This chamber was cut using the new Lambeth/Kiff Micrometer Adjustable Reamer stop. Two measurments were made. The first had the reamer set to bottom out .030 short. Then the Micrometer Adjustable Reamer Stop was adjusted and the final .030 was cut. The headspacing was set .0015 clearance. The bolt closed freely on the go gauge with just a litle bit of resistance. The bolt closed about 10 degrees on the no go gauge. Should know how it shoots this week. John will be at the range on Wednesday.

John has been very successful with a .260 Remington both cross the course and long range. He setback,1) and rebarreled,1), both his .260's last year were Hart barrels. The setback was done at 2600 rounds and got another 900 rounds from the barrel. The newer barrel now has approximately 2800 rounds down the tube. He shot a .439 10 shot group at 100 about 2 weeks ago. He is begining to get some vertical flyers at 900 and 1000 yards an figures he has just about seen the end of this .260 barrel.

It is John's hope is to get the same or better barrel life, with better accuracy, less recoil, and less expense with the 6 BRX. As his gunsmith, I watch with interest. Two of his mentors who are top shooters, both feel he is making a mistake leaving the .260 which has served him well. John is no beginner at this game, he has shot the .243, .260, 6.5 X .284, .270 and a 7mm08 extensively. John has studied up and talked with several of the 6mm gurus. John could have choosen any one of the other 6mm cartridges, IE: 6 X .250, 6 X .47, 6XC, 6 Dasher but decided on the 6mm BRX. John's goal is to find a accurate load with a high BC that will shoot between 2900-3100 fps. What he may give up in wind bucking ability he will regain in accuracy, reduction of recoil, and reduction of cost. The next few weeks and months will be very interesting to follow John's success or failure. John works in the medical field and keeps great documentation. I look forward to reading his upcoming articles.

Rustystud, a/k/a Nathaniel G. Lambeth, Sr.
 
I would love to have Tim North's phone Number if he is the one doing the chamberering with the flush system!

Thanks in advance

Keith
 
Keith:

I did the chambering. As far as I know Tim North does not do any Chambering. I believe he had a guy who was coming in to work in his shop but he had some kind of conflict come up.

Feel free to call,919)556-0554,in evenings) or e-mail me at ngl1@earthlink.net

Rustystud a/k/a Nathaniel G.Lambeth, Sr., Custom Guns and Ammunition, 15 Sunflower Drive, Youngsville, NC 27596

I believe John708 will give me a refrence.
 
John708 came over this evening and fired 30+ 6mmbr cases in his new 6mmbrx. He was just fireforming, 30 grains Varget, CCI 450 primers, Berger 107s. They were seated .080 to .100 into the rifling. Really jammed. After getting on the paper at 25 yards we moved to 100 yards. The brass was fireforming beautifully. He shot 3 ten shot groups under .4 at 100. His groups should tighten up with fireformed cases and 33-34 grains of powder with the bullets seated less forcefully into the rifling. If he had been shooting 5 shot groups he would have had several in the teens. I would saw he is very pleased with his results as of tonight.
Rustystud
 
Folks Thought I would add a couple photos:
The first is my Flush system pump/filter, and tank. the second is a 10 shot group shot by John708 fire forming brass from 6BR to 6mmBRX.

Rustystud
 
Folks:

Here are a couple more photos. Both these targets are 10 shot groups at 100 yards. These are 6mmBR cases being fire formed
to 6mmBRX.
Rustystud
 

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Paul:

John may come out and shoot this afternoon. Now that he has some fire formed brass. He is going to experiment with several different powders, bullets and seating depths. We are going to keep good records and he will be able to report his findings and feelings about the 6mmBRX vs the .260 Remington, 6.5 X .284, and the 7mm/08. John is convienced that what he may loose in BC and wind drift he will regain in accuracy and ecconomy. I rebarreled one rifle and set back two rifles all with Hart barrels last year. He bought two Douglass pre chambered and threaded barrels from Fred at SSS. All now are tomato stakes. John's 260 Remingtons were setback at 2500-2600 rounds and he was able to get another 900-1000 rounds out of them. His last 260 barrel was not set back and has completely gone south at 2720 rounds. It had a surge before it went south. At 2600 rounds he shot a .437 10 shot group at 100.

Rustystud a/k/a Nat Lambeth Custom Guns and Ammunition
http://home.earthlink.net/~ngl1
 
Folks:

It will be interesting to see if John708 shooting his new 6mmBRX in the Any/Any class today at Butner, NC, beat the F-Class Tactical shooters in the 600 yard F-Class match. They shot the new smaller F-Class targets. John said his gun shot well as expected. He will shoot the three 1000 yard matches with it tommorrow. This will be the real test. John said there was only one other sling shooter at the match and he was shooting a 308.
Rustystud
 
My 6BRX long range project is moving along nicely. I'd like to personally thank Bob Crone, for dreaming up this cartridge and Scott Parker for his early load developement work. Scott, your fireforming load of 30.5 grs. of varget and 107mk, jammed hard in the lands, works well. I lost 5 cases out of 110. I jammed the bullets 60/1000 into the lands. How far do they have to go in?

My original goal of this project was to find a replacement for my 260 rem. I've been having trouble obtaining 139 Lapua's lately and thought Serria's and Bergers would be easier to obtain. My 260's never shot Serria 142mk or Berger 140's very well. I wanted to beat my 260rem records.Avg. 10 shot group at 100 yds .58in. Avg ES 10 shots, 11-17 fps.10mph Xwind at 1000yds with 139 Lapua's, assuming a BC of .595 vs .615, 72in. Currently the 6BRX is shooting 105 Bergers with 32.5 gr. of Varget in .38 10 shot groups at 100yd. Xwind should be about the same or better at 1000
yrs. So far so good. More load developement and match results to come. John Skowron
 
John
I am very interested in your outcome and am waiting to see your results,don't let out any details. Good Luck. Looks like a shooter so far.
 
My 6BRX Long range update

Load developement and testing so far. Primers, in this rifle the Federal 205M primers delivered 1/10in. less group size than the CCI 450's. However the 450's were better for fire forming loads, fewer pierced primers, secondary to harder cups, I guess.

Powder: So far I ve tested IMR 4064, Varget and Re-15. In my rifle, all 3 powders produced case ejector marks at 33 grs. At 32.5 grs both 4064 and Varget yielded vel. in the 3080 fps. range. 32.5 grs. of Varget produced 3000 fps. My most accurate loads have been 32 grs. of Re-15, and 32.5 grs. of Varget. Both produced groups of .38 to .46 in. 10 shots at 100 yds. I haven't chronographed my Re-15 load, but I think it's going to run 3030-3050fps. I didn't test groups with 4064. Same vel. as Re-15 with better metering.
Bullets: Identical groups were obtained with 105 Bergers and 107 Serria mk's. I'm going with 105's due to their higher BC. I'll post match results next thread. Good shooting.

John Skowron
 
Congratulation to John708:

Folks John708 took his Savage Model 10 rebarreled in 6BRX an shot it in the Palma Team Fundraiser, 600 yard F-Class match at Butner, NC, this past weekend. Old John708 is not a F-Class shooter he is a former XC and now any/any shooter,sling shooter). John was competeing against some pretty good F-Class open shooters. John did not win but he shot clean for both days and ended up with 89 out of 120 possible Xs. The man,Charles Balard,great guy to) who beat him was shooting a custom action on a custom stock, with a custom heavy barrel,Broughton),in a .300WSM,done by Precision Rifle Sales of Mebane, NC,very nice rifle)) with heavy high BC match bullet. John708 said the winner was a really good shooter and he was proud to shoot with him. The winner shot both days clean and won by shooting 98 Xs. I will say there were some eyes opened to what the little 6mmBRX could do.
It was a very good showing for a Savage Model 10 and a Broughton 6mm, 5C 1:8 twist Barrel. Thanks to Tim North at Broughton for making his great barrel. I will say John708 has been extreemly pleased. The barrel was installed the last week in July and he now as over 800 rounds through it and it is shooting great. John708 has already laid claims to the second 6mm barrel I had ordered for myself. He plans to rebarrel his other target rifle with it. I guess that means I had better order another one for myself.

It will be interesting to see how John708 does at 1000 yards at the NC State Championship next month. He has already shot this rifle at a 1000 yards in an August F-Class match where he shot with a sling. His best scores were 148s out of 150 on the new smaller F-Class targets.

John708 did not win the match but he gave it a great effort. Since the match was over I was informed Charles Ballard works for Precision Rifle Sales and did not want the chanmbering I offered and has given it to John708. What a sportsman and gentleman. Again two days shooting clean and 89 Xs is nothing to sneeze at.

I was told Charles and John were both on the line and shooting simultaniously and a crowd started watching them shoot. One then the other. I was told it was a battle of the two Broughton barrels.

Rustystud a/k/a Nathaniel G. Lambeth, Sr.
 
6BRX LONG RANGE UPDATE

On the last thread Nat mentioned the results of last weekend'sPalma
fund raiser match at Butner. I was using 105 gr. Bergers behind 32.5 gr. of Varget. 32 gr. of Re-15 gave me great vel. 3080 fps. but poor ES, 65 fps. So I dropped the load. This weekend I going to try 31 and 31.5 grs. of Re-15 and see what happens. I think the 105's and 107's probably shoot best in the 3000fps-3050 fps range. I'm going to continue to experiment with different powders and find out. I'm also going to order a 1-7.5 twist barrel, and see if I can get the 115's to shoot. I'll continue to publish testing results as they become available.

John Skowron
 
Excellent reports on the project. Thanks! You're shooting, and I'm learning... Got a few more .308 barrels to use up before I change out though... Regards, Guy
 
6BRX long range project update.

I've completed testing with Re-15 this past wk. I couldn't get the accuracy or low ES as I could with Varget. So I dropped the powder.
During load testing I found the 105's run about 50-75 fps faster than the 107's with the same charge wt. My testing is complete with med. burning powders: 4064, Re-15 and Varget. My current top load is 32.5 gr. Varget, 105 Bergers, Fed. 205 match primers. 10 shot ES is 9 fps.@ 3080 fps out of a 31.5 in Broughton barrel. 10 shot groups at 100 yds. run from .38in to .5 in. This is going to be my 1000 yd. load for the NC state long range champships.
I also tested 3 slower burning powders, VV540, VV550 and H-4350. I will post velocity, accuracy and ES data on the next thread. Untill then, good shooting.

John Skowron
 
6Brx loading update.

Here are the results of my vel. testing using my 31.75 in Broughton barrel:
2 shot avg. VVN550 31 gr. 2927fps 31.5 gr. 2952fps 32.0 2990 fps 32.5 3048 fps 33 gr. 3047 fps 33.5 3084 fps and 34grs. 3122 fps. None of the cases showed pressure signs.

VVN540 31 grs- 2963fps 31.5 grs. 2981 fps. 32 grs. 3030 fps 32.5 grs. 3058 fps and 33 grs. 3110 fps. Again, no pressure signs, but I thought, based on vel. that both loads were probably max. in my gun.
H-4350 31 grs. 2825 fps 32 grs. 2850fps 33 grs. 2910 fps 33.5 grs. 2968fps 34 grs. 2991 fps. 34.5 grs. 3038fps 35 grs. 3070fps. No pressure signs. Comments: I tested the loads individually for accuracy. All loads tested were in the 3080 fps range. Using 105gr. Bergers, none of these loads equalled Varget for accuracy or ES. so I'm sticking with Varget for now. John Skowron
 
6BRX at 1000 yds.

The final test for my 6brx project came at the NC LR state championship, held at Butner. The championship consisted of 4 1000 yd matches, held over 2 days. The winds ran 15-25 mph on day one, and 10-15 mph on day 2. I couldn't believe how well this cartridge performed in the wind. I shot in the 190's for all 4 matches. I placed 5th overall among sling shooters. I was shooting in the any/any class and was placed in F- open, where I placed 2nd. I did not feel handicaped compared to the 30 mag. or 6.5-284 shooters. I was squadded with anouther high master shooter, using a 6.5-284 with 142 gr. mk,s. During the scope phase of the compitition we were both shading the 10 ring with 2.5 moa windage on our guns. Wind drift with both rounds appeared to be almost identical. The points I lost were to poor shot placement or wind calls, not to the 105 Bergers being blown all over the county. Anyone what to buy 260 dies? John Skowron
 
Remaining 6BRX Projects

Now that I know the 6 BRX is competitive at long range I'm retiring
my 260 Rem. However, I still have several projects remaining regarding this cartridge:
Fireforming loads, How far do I need to jam the bullets into the lands when forming new brass? 60 thousands in resulted in 7 split necks out of 110 cases. My next experiment will compare 50 thousands in the lands vs 40 thousands in.

Multiple primer test for accuracy and ES.

Faster powder testing. Namely, H322, Benchmark and H4895.

As my test results become available I will put them on the site.
John Skowron
 

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