For the 6xc Guru's (Part two)

[Maggiesdraws]

Well, I'm over the hump on the 6xc I and 6xc II stuff and thanks to all who responded.

Now for part two....... I have both H4350 and IMR 4350 powder and have read they are pretty much the same except one is more temperature sensative than the other. Yes?

I will be using Norma brass and 105's. I've read starting powder drops anyplace from 36 to 38 grains and not much mention of what kind of primers to use.

So my question, where do I start? Again, any and all help is much appreciated. BTW, barrel is 1:8.

Thanks

 

[zipollini]

Primers

Federal 210M
CCI BR-2
Wolf

 

[SDWhirlwind]

I shoot 40gr. of H4350 in both of mine with BR2's and 107SMK's. Moly in the Rock Creek with Win fireformed brass until it gives up the ghost @ just over 3K. Using Norma and nekkid in the Krieger. Have not run it past the Oehler yet. Both shoot how do the hot shots say it? "lights out" I think it is. Don't know what it is supposed to mean but read it enough it must mean something! NOT!!

 

[Frankr]

well I am not qualified as a Guru by any means. Just a shooter. I have shot a lot of FED 210M and CCI200's with good results.
Shot some Seller & Bellot LR and had some good SD/ES Numbers but the ones I have are small ie like they go in a new case easy and they are deep in the pocket SO I don't like them or use them. Been shooting CCI BR2's lately and they are kind of hard to beat IMO but more expensive and harder to get as no one local stocks them.

 

[dantiff2]

Obviously the more options you can try the better off you are. That's one thing I haven't gotten around too. My initial load went into a nice small group with 38gr of H4350. I'm pushing 105vld's @ 3050 fps with no pressure from a 26" tube. This was all started with a CCI #200. Once I saw the accuracy that I desired I lost all interest in trying different components. I will make note that I think it's more of a velocity node than anything else. My groups only opened up the higher I pushed the VLD's. Hence why I settled at 3050. Not sure I could hit a higher node without being too hot. Find a node you're comfortable with and try different brands at that node. Who knows?


Dan

 

[WyleWD]

Since you have both H and IMR 4350 my advice would be to try them both. I used to use H4350 with very good success. Since the great powder shortage of a couple years ago, my experience has been that H4350 is slower than it used to be. In a couple of XC's that I load for now my go to is IMR. Your barrel length, twist rate, bore diameter, and powder choice etc. will dictate to you which is best for your rifle.

As for primers I use CCI BR's and occasionally Rem 9 1/2 primers. Just my experience with them. WD

 

[Petey]

Fed 210 or 210M. As the others state, either will work. I personally shoot H4350. Just broke in a barrel about 2 weeks ago and the accuracy nodes fell identical to the first barrel, just .4 gr less. You'll find it shoots best in that 3050-3075 range with those. Depending on your barrel length it'll be probably in the range of 39.2-39.8 grains. I found another node 1 grain less but she opens up at 1000. So you will probably find an accurate load in the 38.5 range, but be looking a grain higher for another node.

My two 30" Krieger 1-8's shoot 39.4 & 39.8 gr H4350 for 107's with Fed210. I know the bergers are close as my father pushes the 105's handy to 3100 out of his 6CM and it almost shoots as good as my XC

Btw I loaded up 38gr charges to break the barrel in and was scrubbing in between each shot @ my 300 yard target. It shot a nice little 1-1.5" 6 shot group while breaking it in and it wasn't even in the accuracy node. You'll find it'll be easy to find an accurate load quick. Took me 23 shots, 10 breakin, 13 ladder. Found my node shot 3 different seating depths at 510 yards, all were at or well under 2" (5 shots) picked the tightest (1.5")and brought it to the 1000 yard range this weekend and I was impressed.

If you want to know where to start, here's where I started:
My ladder started at 37.80 and went to 40.20 in .20 grain increments.

That's just because I barreled my second gun identical. If it was a different brand or twist or bore ( mines .236) I probably would have gone up and down another .6 grains for the ladder. I just knew what to expect

 

[Frankr]

well I would say 38.0 gr of H4350 would be where I would start. But I have a 1-8 twist 26" and it did not shoot till I hit 40.0 gr and was in a hole at 200 yards at 40.5 gr..so It seemed to like more powder. anything less than 40.0 had vertical. And that barrel will easily push a 105 Berger at 3,150 FPS with RL17....But I believe I had some Brass, Norma that had a little more internal capacity..As it seems the new Brass I have I had to Re tune a little but 40.0 is what it likes. If I remember right it was around 3,050 FPS at 75-80 Deg F. But RL17 has shot real well for me also..As a matter of fact I prefer RL17 as I am mostly Hunting and just playing around target shooting. And the 105 VLD at 3,150 FPS is just FUN all the way around.

 

[Maggiesdraws]

Thanks for the help folks.

 

[Damon555]

By no means a guru....more like a rookie.....but like FJIM said RL17 works good too. I've gotten great results from RL17, H4350 and Varget....With CCI200's or BR-2's.

My starting loads were 38 grains of H4350, 36 grains of Varget and 37 grains of RL17 with a 105 Amax and Norma brass.....My best accuracy with each powder was as follows: 38 grains of RL 17 was great and ran around 3100 FPS....H4350 turned in great results with 40 grains at around 3150 FPS....and the Varget load turned out to be 36.5 grains which incidentally shot very, very well with new brass....but I've never run that load over a chrono. All these loads were tested with 105 Amax (which provided my velocity numbers) and 107 SMK's out of a 28" Criterion Prefit.....The barrel prefers the Amax......

 

[dbduff]

How much are you folks jumping or jamming Berger hybrid 105s? My accuracy seems to be in that 38.5 node H4350 .oo5 off jam. Inch and a quarter-5 shot 300 yards. Borden action- my gut tells me it should be better.
D

 

[dantiff2]

How much are you folks jumping or jamming Berger hybrid 105s? My accuracy seems to be in that 38.5 node H4350 .oo5 off jam. Inch and a quarter-5 shot 300 yards. Borden action- my gut tells me it should be better.
D

That's a nice shooting rig. No doubt, the wind flags will make the difference in your overall group size at 300. Under 1/2 moa at 200 yards is expected these days but under 1/2 at 300 is a good result. Just remember, a missed 3mph wind call at 300 is 1/2 moa or better so keep up the good shooting

I found a happy place at .025" off touch with the 105HVLD. It's a sweet spot where I could move +/- .005 with no effect. I like having a bit of tolerance like that.

Dan

 

[dcali]

I use 39.3 of H4350 under Sierra 107's. Shoots beautifully. Seating depth didn't seem to matter much.

 

[AckleymanII]

I am shooting bug holes with 39g of R#17 and 105 A max, not picky on seating depth also.



two larger groups were bullets jumping a long ways, still in the 2's. Seating depth from .006 jam to .030 jump all shot hummers.

 

[Swamper1987]

That's a nice shooting rig. No doubt, the wind flags will make the difference in your overall group size at 300. Under 1/2 moa at 200 yards is expected these days but under 1/2 at 300 is a good result. Just remember, a missed 3mph wind call at 300 is 1/2 moa or better so keep up the good shooting

I found a happy place at .025" off touch with the 105HVLD. It's a sweet spot where I could move +/- .005 with no effect. I like having a bit of tolerance like that.

Dan

I have found in my bartline 1-8" 5r that .025" jump really worked shoot it in 600ibs multiple sub 2" groups I run 4007ssc the gun loves it with a 105 hybrid still think there is room for improvement. My other xc I'm currently working on tuning a load shows a lot of promise.

 

[AckleymanII]

I made a project out of this chamber, made brass from Lapua 308 and 308 Palma. The brass when formed had a very long neck, about .113 longer than normal, so I ordered a PTG neck reamer only. I cut the neck .123 longer, then added .030 freebore only.

Two benefits from this, whole lot less freebore but the bullet is still out of the case a tad more than normal length with .105 freebore. Second advantage is somewhat a theory, turbulence point is changed. I may get longer barrel life from changing the turbulence point, but the short leade will really give me longer barrel life, that .113 longer neck is a sexy looking little cartridge.

 

[dantiff2]

Any pictures? Would love to see it.

 

[AckleymanII]

Any pictures? Would love to see it.

Here are some freshly turned awaiting fire forming with 14g of Bullseye and House of Autry corn meal; these have large rifle primers formed from once fired Lapua 308 brass, and I would never recommend ever doing this due to web expansion in who knows what kind of chamber.


This one has not been fire formed yet either.



Here is palma brass formed and awaiting neck turning



I am shooting a 31" 8Twist X caliber barrel, 39g of R#17 has no pressure issues at 3170, and 40g is 3270 105 A max, I would never have guessed that an A max would be capable of this kind of accuracy, probably should go and buy a lottery ticket. I am still in the development stages but 39g shoots as good as any 6PPC that I have ever owned, and that is a mouth full.