6BRX HELP!PLEASE!
- Thread starter Josh11
- Start date
bozo699
Gold $$ Contributor
Killshot said:
Why what Killshot?....Why did I use one piece of brass to break in my barrel and do my preliminary load work? because I wanted to see just how long the case would last and because my range is less then 100 feet from my back door and my reloading room is my shooting range so I just load and shoot, I don't have to load and drive to a range, and because I could I guess
is that the why you were referring too?Wayne.
I have been using the COW method for the past hundreds of cases without any loss or wear of my match barrel.
I expand the neck to .257 and neck size the first .040 or so with a .265 bushing to create a false shoulder. keep screwing the die in until you can close the bolt but feel a slight crush( remove firing pin first) carefull to keep the lugs greased, especially on a BAT. Fill primmed cases with 9.5 grains Win 231, top off with the COW to leave space to for a small ball of paper towel jammed in the case. carefull to clean the barrel before resuming real shooting.
Tom
I expand the neck to .257 and neck size the first .040 or so with a .265 bushing to create a false shoulder. keep screwing the die in until you can close the bolt but feel a slight crush( remove firing pin first) carefull to keep the lugs greased, especially on a BAT. Fill primmed cases with 9.5 grains Win 231, top off with the COW to leave space to for a small ball of paper towel jammed in the case. carefull to clean the barrel before resuming real shooting.
Tom
I started making my own brass for a 6.5 brx. by necking down 6.5x47 and 308.
I found a 3 die set of 7mm BR form dies that work great, but it is a lot of work.
But you have some control of the neck length.
Once you have the dies set for the right amount of head space, just lube and run them through. the last die is the ream die for the inside of neck.That is the hard part,
reaming by hand. and then annealing then run them in a 6.5 fl die and trim to length.
6.5x47 lapua brass works as does 308.
Tried the 308 FC brass last week,5 shots in 1/2" at 200 yards.on the first firing
i am going to work up some 308 lapua palma brass i got on here cheap next.
John H.
I found a 3 die set of 7mm BR form dies that work great, but it is a lot of work.
But you have some control of the neck length.
Once you have the dies set for the right amount of head space, just lube and run them through. the last die is the ream die for the inside of neck.That is the hard part,
reaming by hand. and then annealing then run them in a 6.5 fl die and trim to length.
6.5x47 lapua brass works as does 308.
Tried the 308 FC brass last week,5 shots in 1/2" at 200 yards.on the first firing
i am going to work up some 308 lapua palma brass i got on here cheap next.
John H.
I shot this weekend to fireform my brass and I didnt get one failure. Shoulders were good and sharp. What happened was there was a burr in my chamber on the shoulder that was leaving an impression. I sent it off to Greg Tannel and he fixed it right up for me. I was shooting 27.5 grns of H4895 and was hitting steal plates from 100-600 yards. Cant wait to get to load development.
Just recently had a take-off 8 twist 6BR barrel re-chambered to 6BRX with my reamer. Never was a really good barrel. Fired case dimensions are identical between both, and I just finished fire-forming 20 more pieces. Had 2 "clicks", failures to fire, weak hits on the primer (CCI450), so changed over to the plain brass Winchester, claimed by Winchester to be "easier to ignite". Also went from a .266" to .265" neck bushing, 85 gr. flat base HP ( cheap bullet). Kept the previous .015" of jam, 30 grs. of Varget. The remainder of the brass fire-formed perfectly. Headspace length is within .002" to .003" of what I get with many times fired brass. Brass is fully formed with sharp corners.
Am up to 31 loadings now on one box of 20 and just a trace of the primer pockets opening up a bit, still good primer seating.
Standard 6BRX load is 33 grs. of Varget (2950 fps in my barrel), 107 SMK, seated to touch, BR4 primers.
The dedicated fire-forming barrel is working out well.
Am up to 31 loadings now on one box of 20 and just a trace of the primer pockets opening up a bit, still good primer seating.
Standard 6BRX load is 33 grs. of Varget (2950 fps in my barrel), 107 SMK, seated to touch, BR4 primers.
The dedicated fire-forming barrel is working out well.
another trick for cow fireformers; i bought a large bale of fire resistent attic insulation. punched a hole in one end just to allow my barrel to be inserted about half way. first insert a broom handle or equavalent into the bale halfway and rotate to make a small cavity. insert barrel and...whummpph. QUIET! i'v done hundreds with the same bale, but have had to duct tape the seams. anhydrous lanolin makes a quick plug to keep cow in case. as noted, the body shoulder angle is often not as sharp as when fired in gun, but beats having to go to the range or wear and tear to the bore using real bullets.
I went for load development today and got some weird results with Varget. I loaded up from 31.5 -33.6 in 3grn increments. I shot a fouler shot and got to business. The first group with 31.5 sucked. Then I jumped to 32 and that went in around .206. Then 32.3 was not good at all. It had a lot of vertical. Then the next good group was at 32.7 with .155. There was not a good group after that all the way to 33.6 with no sign of pressure. Should I keep going up in powder charge or just keep it where its at? 32.7 seems kind of low for a BRX.
bozo699
Gold $$ Contributor
Josh,Josh11 said:
I am able to go 34.5 in my son's Savage #12 in 6brx but it's a HOT!! load, 32.7 is hot in some, I would shoot what was accurate, however one 5 shot group isn't proof by any means but out of the 5 - 6brx rifles I have dealt with 32-34 grains of Varget behind a 107 SMK can almost be a go to load as far as I am concerned, try shooting the 32.7 again and again to se if it repeats
Wayne.
DennisH
Life Time NRA member
Mine is 33.5, so your right there, if it shoots good and you should definetly have the speed, I would stick with it. Some say I am on the high side with 33.5, one person I know is in the 30.0's, it's just what your gun wants.
32.7 is not high for a BRX, my 6.0x47L only takes 35+ grns!
I personally believe if you are accurate with this load, let it be!
This sounds normal!
Where are you on the lands?
bozo699
Gold $$ Contributor
Dennis,DennisH said:
You have contradicted yourself there, I said 32.7 is hot in some, not that it is a written rule but it is on the upper end, my son's Savage likes 34.5, it's HOT!! my gunsmith's 6brx max load is 33.0 grains of Varget w/107SMK, both chambered by the same man with the same ream, 32.7 is only .03 shy of max in his rifle so I say again 32.7 grains in SOME rifles could be on the hot side or upper end, however you want to put it, in your own words,..."it's just what your gun wants". Not trying to be argumentative just saying 32.7 is going to give you over 3K fps in most rifles so if it shoots good,...Better then at 33.6 then I would go for accuracy, however since there was no pressure signs at 33.6 then I guess you could, rather Josh could work loads on up in the .03 grain increments until he reaches max load, maybe he will hit another accuracy node, one thing to keep in mind with Varget, it can and does vary from lot to lot so me personally I either would like to be on the lower side of max or buy a lot of powder of the same lot #
Wayne.
bozo699
Gold $$ Contributor
Josh,Josh11 said:
Most people find the SMK's like to be jumped, I like you found a jam to be better in the 6brx, both my son, Paul and his sons 6brx rifles liked the 107's at .012 into the lands. I just chambered two new 6brx rifles for this year and I am trying the 105 hybrids in my 17lb. and 103 Spencers in my 11lb. rifle with H-4895, my first match is this weekend so we will see if I should have stuck with the match kings or not
Wayne.
DennisH
Life Time NRA member
Wayne, I guess I should have stated "my" BRX does not show pressure signs @ 32.7. Mine loves 33.5 Varget with 107 SMK's on the lands. Anything over 33.5 in my gun starts showing pressure signs.
I shoot with several people who don't get close to 33.5 grns! Too hot for their gun!
Josh made the above statement. I guess my point is I don't know of many shooting more than 33.0 grains in a BRX! His gun could be one of the few that's shoots 33.6grns or better, there out there.
I hope this clears up any misunderstanding!
There's a post in 6mmbr where a person fireforming his brass was .030 in the lands and his load was hot! Turns out this is what his gun liked! I will see if I can find the post! Interesting read. I did try it, but my gun didn't want no part of this load! I didn't use Moly, FYI
Beckman had a pretty interesting Load Development process.
http://www.6mmbr.com/gunweek062.html
This is his favorite unbelieveable load:
33.7 grains Varget
.267" Neck Bushing
Federal 205M primers
Sierra 107 MKs (moly-coat)
Bullets .035" into lands
bozo699
Gold $$ Contributor
Dennis,DennisH said:
My son is shooting 34.5 however in the August shoot the primers were starting to crater pretty bad, only a few but??..not piercing but close, we are going to back it down to 33.5 or 34.0 for this year, it isn't worth the chance.
I apologize I should have stated we were using moly.
This guy's load mirrors our load except for the seating depth, we were .012 into the lands.
Dennis I got your p.m and will get back to you this evening, I just stopped for a sandwich, I am heading back to the range ;D seeya..........
Wayne.
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