6mm BR
- Thread starter Bugzlife19
- Start date
Yes I trimmed it to 1.550” per my reloading manual and that was obviously too short. Did I ruin this brass or can I just run it with less powder and eventually it will lengthen out again?
Nah nothing wrong with that. Typical 6br chambers are 1.570, 0.020" under is not a problem. I'd purchase a teslong bore cam if you don't have one, and inspect the throat area.
It’s only this set of reloads though. I just shot a match yesterday with virgin brass with the same load and had 0 problems.
I might have missed it but what die are you using? Could it be the brass has grown so much and the die is not sizing the body down enough which is causing the brass to swell up and not contract which could be causing the increase in pressure therefore increasing velocity?
Could there have been moisture in the chamber or some left over cleaning fluid causing a spike in pressure?
Could there have been moisture in the chamber or some left over cleaning fluid causing a spike in pressure?
It sounds like now would be a great time to to revisit all types of your brass and measure everything and record it. Case length, neck diameter both before and after , case diameter right at neck-body junction, case diameter at base above web reinforced area, comparative headspace, etc.
Oh, and do you anneal at all? Just curious.
I make the necks glow red and the annealing line is below the shoulder, what I found is that if you don't get it red when you bump the shoulder and size the neck there is spring back. I swear its more of an art than a science.
Berger 108EH jumped 55-60 thou and Varget... 30.0 grains look good considering I watched the reticle on shot #4 drop low left just as the shot broke. 28" Benchmark.
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109 Berger, Viht N150, jumping 60k, L group is 30.5 going 2860, R group is 30.0 going 2815. Both 10 shot group. UPS man dropped barrel off yesterday, had a bunch of virgin brass to FF, loaded up 105 and 109s with Varget and N150, did some jump tests for break in.
Built a cheap 6br for practice, solus action, 28in CRB 7.5TW M24, MDT chassis, theos scope. Shoots pretty dang good.
Built a cheap 6br for practice, solus action, 28in CRB 7.5TW M24, MDT chassis, theos scope. Shoots pretty dang good.
30 grains of N150 and berger bullets must be a prophecy or something... 
108 Elite Hunter's jumped .060 from a 28" Benchmark.
108 Elite Hunter's jumped .060 from a 28" Benchmark.
These lil 6br are pretty sweet, they'll pretty much shoot half moa with minimal effort. Just pick the speed you want to run and go.
That’s why we call them the easy button. 30gr of something decent and you’re golden.
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Had to drop to 29.8 to keep mv at 2810-2820 as things sped up a bit by the time I had 250 rds on the barrel.
29.8gr N150, 2815mv avg, 109lrht -60 cci450.
100y zero check 8 shots dialed L 0.2 mil, and 7 shots at 400y.
29.8gr N150, 2815mv avg, 109lrht -60 cci450.
100y zero check 8 shots dialed L 0.2 mil, and 7 shots at 400y.
This barrel of yours is on a solus action correct? Good shooting by the way!
Yes, it's an origin prefit from my smith. He cut me a CRB M24, as well as a Hawkhill X-heavy palma.
This is a 6BR barrel that I picked up used for $200. The person I purchased it from has no information on this barrel as he bought it for the action. All we know is that it’s a 1-10” twist.
No manufacturer or gunsmith name on it.
Savage style barrel nut.
Where would you go from here?
I only have around 35 GM205M primers but I will search out more if testing proves that group sizes are smaller than with BR-4’s
From my limited testing it seems that it may be the case.
That’s the next test I will be doing this weekend.
The snow is just starting to clear from our range and a good spring cleaning and target stand repair is needed
No manufacturer or gunsmith name on it.
Savage style barrel nut.
Where would you go from here?
I only have around 35 GM205M primers but I will search out more if testing proves that group sizes are smaller than with BR-4’s
From my limited testing it seems that it may be the case.
That’s the next test I will be doing this weekend.
The snow is just starting to clear from our range and a good spring cleaning and target stand repair is needed
Welp, think I'm going to run 29.0 grains of varget and 109 Hybrids jumping about .055" in this barrel. Groups well, velocity numbers are great and I can feel less recoil here than with 30 grains plus i feel it'll be more consistent throughout all the environments I find myself in at PRS matches.
A comment re Varget: just NO, I'm not paying over $400 a jug for it plus hazmat and shipping. I just got a jug of N150 for $371 to my door; saved right at $100 over Varget from the same vendor (BCR) and if it does as well in 6BR as N135 has in .223 I'll be a very happy curmudgeon.
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