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New to 6br

Piglet

Silver $$ Contributor
Hello guys. I bought a 6br early last spring, used rifle off of this forum. It's a 28" 8 3/8-8 gain twist barrel. Supposedly a bartlein, but no way to know. I've been shooting it off an on this year and can't seem to get above 2800 fps. 107 sierra seem to shoot the best so far. Getting low s.d. but the really low ones don't produce the best groups. Anyways I worked up to 31gr of shooters world precision to get 2795 fps Ave, and 2.0 SD. 30.7 varget gave me 2792 and 7.7sd. Was not happy w any of the varget loads I shot, but may have been me. So my question is why am I so slow? And where do these bullets like to be velocity wise? Do I need a faster powder? How much faster? Thanks for the help
 
Have you tried adjusting seating depth? I would take accuracy over velocity. Is the 31 grains of shooters world a max charge or is there room to go higher? I have a 27" barrel and all my 105-107 loads are over 2800....but I also have a .236 bore 5R. I have found that in my chamber, bullets typically like to be jammed .010-.015.
 
I have an 8 twist Shilen 28 inch --with Varget 30.0 and the Sierra 107 I get 2820 and one hole groups--it did not play nice until I did seating depth--just into the lands enough to put a square engrave--it was ok with jump but started shining when I went into the lands. I use CCI 450 primer it is faster--so I get 2820 with one brass and 2850 with identical load in other brand of brass using Peterson and Lapua Jammed is the way to get it working I bet
 
Hello guys. I bought a 6br early last spring, used rifle off of this forum. It's a 28" 8 3/8-8 gain twist barrel. Supposedly a bartlein, but no way to know. I've been shooting it off an on this year and can't seem to get above 2800 fps. 107 sierra seem to shoot the best so far. Getting low s.d. but the really low ones don't produce the best groups. Anyways I worked up to 31gr of shooters world precision to get 2795 fps Ave, and 2.0 SD. 30.7 varget gave me 2792 and 7.7sd. Was not happy w any of the varget loads I shot, but may have been me. So my question is why am I so slow? And where do these bullets like to be velocity wise? Do I need a faster powder? How much faster? Thanks for the help
In my experience your speeds are right on the money for a 6BR. Mine, with a 24" barrel drove tacs at 2725 fps. Enjoy your rifle and shoot it!
Paul
 
You may know all this but not knowing your experience level here’s my input for what it’s worth. Not meaning to be critical here at all just trying to help.

I agree that’s a little slow for those powder charges unless you’ve got a really slow lot of powder or your barrel round count is high. Any idea what your round count on the barrel might be? If you’re less than 1000 rounds that’s probably not contributing to a little bit of slow speed. If you’re near 1500 rounds get another barrel.

I have no experience with Sierras. The few I’ve had liked the Berger 105 hybrids or VLDs with 5-10thou jam at around 2860-2890. Every barrel and components are similar but yet different so be cautious trying to repeat others loads.

Find your touch point using the Wheeler method and start at 5 thou jam and work up in 3thou increments but try not to exceed 15thou jam with concerns of pulling bullets.

Varget & CCI 450’s are hard to beat in a 6br so something about your combination obviously isn’t working. If it’s not shooting .3moa or less at 100yds something isn’t up to par. Bench manners, rest set up, rifle bedding just to name a few.

Like others said I wouldn’t let the speed worry me much. Find a local mentor to go through your setup with you, it could be something simple and time well spent.

Good Luck and keep us posted!
 
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unfortunatly I don't have any idea how many rounds are down this barrel,as I bought it used. I'm not new to guns,shooting,or reloading but I'm no where near the level of most on here. always just a live varmint hunter. I bought this rifle this spring,an annealer,a Garmin,and a teslong after wards. i had a chronograph b4 that worked on the best days!I don't see alligator cracking,but barrel was rough and I firelapped it w the tubbs firelapping bullets. accuracy improved while and after I was fire lapping. I've shot from .223 -.400 groups w precision powder w out any seating depth adjustments. worse groups are more then those. I see no real pressure signs w these loads no ejector marks,leaking primers,flat primers, or heavy bolt lift. another question I thought of is do I use the load that got the lowest s.d. to adjust the seating depth? or do use the load that's shooting the smallest? I've been seating my bullets .002 away from touching. I did use the Alex wheeler method to find the lands. I absolutely agree that accuracy Is more important then velocity, I'm just concerned I'm too slow to get the best accuracy out of it.
 
Seating depth impacts es and sd in my experience so I’d go with a powder charge that shoots the best over 2-3 tenths of a grain, get in the middle of that node and then do seating depth test.

Good luck and keeps us posted
 
Seating depth impacts es and sd in my experience so I’d go with a powder charge that shoots the best over 2-3 tenths of a grain, get in the middle of that node and then do seating depth test.

Good luck and keeps us posted
got ya. thanks for the insight.
 

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