6BRA load data

[OmegaRed]

Loaded up windows on each side of seating depth to recheck last years load. It was way tighter of a window than I like, but it's consistently hung there.

Shot a different barrel after this group that was about .3 grains lower than this. Shooting RL15

 

[Longtrain]

Last fall, before a match, I ran this load by a Labradar and it showed speeds of 2963-2972. Averaging ~2969.

Approx. 350 rounds later.... Last month, before another match, I ran this same load by a Labradar and it showed it running consistently around 2925. Not sure what's up with that?....oh well...

This load has been shooting well so I generally don't pay too much attention to the speed that shows up on the Labradar.

Your throat is going to lengthen about .004” every 100 rounds, so about .014” more boiler room then before those 350 rounds. If you seat your bullets out further to make up that distance, you’re still going to get less pressure by increasing case capacity and therefore a drop in velocity. It comes with the territory, I’m on my third Dasher barrel and my velocity predictably dropped as my throat lengthened.
On the good side accuracy usually stays even with that longer jump.

 

[Dave Way]

I was loading some ammo today and came across this 600 yard powder “ladder”. It is probably the most interesting representation I have shot of that “flat spot” we look for when tuning a rifle, so I figured I’d post it here.

6BRA, .268” neck, .265” loaded round with a .261” bushing, Lapua brass, 29.6-30.3 gr. of H4895, 205M, Hunter 103gr. It would have been a real mess if the gentle L to R wind hadn’t steadily picked up!

The orange dot is 1”.



Dave.

 

[17VLD]

Excellent shooting, I bet a few of us would love to know how the seating depth test went. Especially with 30.0

Matt

 

[Dave Way]

Excellent shooting, I bet a few of us would love to know how the seating depth test went. Especially with 30.0

Matt

Jammed .008”

 

[Ga-Bulldog]

Dave, is this with the latest batch of H4895 that hit the street about 90 days ago? Thanks Gary

 

[6BRA]

Jammed .008”

Curious what velocity this was at?

 

[Dave Way]

Older lot of powder #7076. 30.0 runs about 2,930 fps.

I have not played with the newest lot.

Dave.

 

[Freezebomb]

Finally back on the range after some shoulder surgery and a ton of Physical Therapy. Trying out the Berger 105 so ran a quick couple powder test to test the shoulder and a new bipod and scope. All seated at jam minus .020. All I had access to was 100 yards to knock off my rust and get some numbers.





Part of me wants to load up at 31.3 but the high(er) SD/ES and the vertical isnt the same scares me a bit... Feel free to drop me your thoughts. Spending this year going slow and learning everything I can.

Below is the first Powder test as well for .3 jumps.

 

[whatwind?]

600 yards…..Varget ladder, 31.1 to 31.9 gr, 2 shots each, 103 VT +6, BR-4 (7 thou under rim) Peterson, 265 bu, 267 ld nk, no annealing, still under 100 rounds on standard bart HV bbl
Had pressure at 31.9 gr
5 and 6 are 31.5 gr stacked in each other and was 2962 fps this day

This is a new reamer that I combined from sam hall (463 shoulder) and Wheeler standard bra reamer, Old dominion chambered

 

[Owens85]

600 yards…..Varget ladder, 31.1 to 31.9 gr, 2 shots each, 103 VT +6, BR-4 (7 thou under rim) Peterson, 265 bu, 267 ld nk, no annealing, still under 100 rounds on standard bart HV bbl
Had pressure at 31.9 gr
5 and 6 are 31.5 gr stacked in each other and was 2962 fps this day

Around 2960 with varget is where I've seen good stuff happen.

 

[YBPS]

Anyone shoot 87 grain Bergers with Varget out of a 26” 1:8?

I have been been shooting 105’s out of a straight BR and they just don’t kill that great. I think they are a little slow and the bullet is not expanding. I have a 25” 8 bartlein. It’s very accurate but only getting 2755.

Considering a BRA for more case capacity and a lighter bullet for coyotes 350-600 yards.

Thoughts?

 

[RussellJ]

Anyone shoot 87 grain Bergers with Varget out of a 26” 1:8?

I have been been shooting 105’s out of a straight BR and they just don’t kill that great. I think they are a little slow and the bullet is not expanding. I have a 25” 8 bartlein. It’s very accurate but only getting 2755.

Considering a BRA for more case capacity and a lighter bullet for coyotes 350-600 yards.

Thoughts?

Maybe it's a starting point for you to try. I have been fire forming Lapua brass in my 6BRA with sorted 87grn V-Max bullets and 30.8grn of Varget. Very accurate load in my gun.

 

[YBPS]

Maybe it's a starting point for you to try. I have been fire forming Lapua brass in my 6BRA with sorted 87grn V-Max bullets and 30.8grn of Varget. Very accurate load in my gun.

Thanks. Velocity?

 

[Mulligan]

Don't hear too much about Alliant 15.5 for 6 BRA. Would it be a good pick for Berger 108 targets or is it too slow burning?

Only because those using it, are doing a good job of keeping it quite.
CW

 

[Mulligan]

So probably little load data around? I wonder if it's better than Reloder 15 for the 108s?

I know the NBRSA Nats were won a couple of years ago with 15*5 in a BRA.


Edit to add link

NBRSA 2022 long range nationals

Jeff, you are the man. Congratulations to a true competitor and a very humble newbie shooter. I now know for sure you have literally jumped out of that category. You are now the person I need to receive advice from. Thank you for your friendship these last couple years. Continue to experiment...

forum.accurateshooter.com

Check out the equipment list

CW

 

[rwj]

Lack of data might also be related to its limited availability and high cost…

 

[Tomiboy]

I'm a beginner and I'm shooting 31.4 of Varget under a Berger 108, seated +.006", BR4 primer, Lapua cases, velocity is 2,940 FPS. My question is...is there a known velocity node for these 108 bullets

 

[ChristianSilver]

My BRA w/ Berger 105 on top of XBR8208 @ 30.1 grains is very happy at 2,940fps…
Shoots very small dots at 600yds.

 

[wkdickinson]

I am having a problem getting the velocities everyone else seems to be getting in the BRA. In order to get over 2,900 (actually 2,920) I am at 32.3 gr of Varget with 107SMK, CCI 450 and new (fire-formed and reloaded twice) Peterson brass. I am not getting any pressure signs with this load and it shoots really well. But I am concerned about why I need an extra 1.0gr to get there. Kelbly Atlas, 28" Brux 8 twist (3,500+ rds.), Garmin XERO, AutoTrickler V4. Anyone's thoughts would be appreciated.