6BRA load data

[AckleymanII]

It would also be nice to see load data for varmint hunters.

55g-80g, which should also be faster than std BR case.

 

[Eric Leonard]

It would also be nice to see load data for varmint hunters.

55g-80g, which should also be faster than std BR case.

Start about 30.5 grs lt32 and work up with 68 gr bullets and you can get to 3700 with really good accuracy

Start about 31 hrs 8208 and work up with 80 gr bullets and you can get to 3300 with really good accuracy

 

[JFrank]

RL—15

 

[SilhouetteShooter]

What kinds of seating depths and powders/charges? Even good bullets may not shoot in every barrel, a bunch of deep creek guys are using the v-tacs with success. If a different bullet will shoot smaller dont fight it.

Correction on the varget load...
For seating depth, I started into the lands .010 and .030 off.
Powder I have tried H4895 and Varget in the BRA. I do a 3 shot ladder test per charge weight and group size and location using a grid. That way I see where point of impact is per group.
H4895 was 29.5 to 30.7 settled at 30.1 for the 105 Hybrid ES 9 for 10 shots and SD of 3.3. Muzzle velocity 2934 and 10 shot group average of .619
103 VT auto groups were better with Varget, low ES and SD, was 6 and 3.0 with a charge weight of 31.1, group size went from over 2 to about 1.360..from seating depth. Vel 2958
H4895 settled on 29.9, vel 2950 sd 3.3 Es of 6. Groups were the same.

Any thoughts? Pushing to fast?

 

[Alex Wheeler]

Have you tried the high node? Over 3000 fps? Id keep going up in powder if you dont see pressure. Should be 31-ish of h4895

 

[SilhouetteShooter]

Have you tried the high node? Over 3000 fps? Id keep going up in powder if you dont see pressure. Should be 31-ish of h4895

I have not, but I’ll give lot another try. How is that load on primer pockets?

 

[Jet]

I have not, but I’ll give lot another try. How is that load on primer pockets?

I've shot a good bit of 6BRAI with 31.1-31.2 of H4895 without pressure signs. I don't think I've tossed out a single piece of brass for loose primer pockets.

Good shooting

Rich

 

[SilhouetteShooter]

I've shot a good bit of 6BRAI with 31.1-31.2 of H4895 without pressure signs. I don't think I've tossed out a single piece of brass for loose primer pockets.

Good shooting

Rich

Well 3000 i will try

 

[BartsBullets]

This is a new barrel and I consider it to be mediocre so far. My normal seating depths and loads didn’t seem to work, so I did a full seating depth and load work up. Each row across is shot with the same seating depth with 5 different loads. Then the seating depth was increased +.003 longer and the same 5 loads repeated. I also used the same aiming point for each group (6 o’clock on the mothball). I shot 3 shots at the mothball before moving to the next (not round robin style). Conditions were fairly light. Each group has size, velocity, and extreme spread listed.

This method provides a lot of info on your barrel and plenty to look at.

Bart

 

[Link]

A lot to look at. What load did you go with

TY Don

 

[tom]

+3,+6,+9,+12?????? Bart, you're not working from "touch" like us long range tards I hope? See ya in a couple weeks.

Tom

 

[Alex Wheeler]

Looks good Bart, +9 at 29.8-30.2 grains looks like a stable area to me, but they do eventually have to go vertical though right? Have you done any tuner work yet?

 

[BartsBullets]

+3,+6,+9,+12?????? Bart, you're not working from "touch" like us long range tards I hope? See ya in a couple weeks.

Tom

Tom,

Us short range types have been doing that since the beginning of time. Probably where the long Barrels got it from. Im looking forward to it!

Bart

 

[BartsBullets]

Looks good Bart, +9 at 29.8-30.2 grains looks like a stable area to me, but they do eventually have to go vertical though right? Have you done any tuner work yet?

Alex that’s the spot. Three decent groups in a row. My guess is it will start coming apart around 2960. However +3 has some merit. It never shot small but it didn’t do anything stupid either. Haven’t played with the tuner yet.

 

[GlennK]

View attachment 1197369
This is a new barrel and I consider it to be mediocre so far. My normal seating depths and loads didn’t seem to work, so I did a full seating depth and load work up. Each row across is shot with the same seating depth with 5 different loads. Then the seating depth was increased +.003 longer and the same 5 loads repeated. I also used the same aiming point for each group (6 o’clock on the mothball). I shot 3 shots at the mothball before moving to the next (not round robin style). Conditions were fairly light. Each group has size, velocity, and extreme spread listed.

This method provides a lot of info on your barrel and plenty to look at.

Bart

I vote 30.1 at 10 in

 

[Alex Wheeler]

It would also be nice to see load data for varmint hunters.

55g-80g, which should also be faster than std BR case.

I am shooting 34.5 grains of H332 with a 55 blitzking .010 in the lands with a 205. I dont remember the exact speed, but its 3900+ with a 24 or longer barrel if I am remembering right. I have used this load in about 3 barrels its been about .25 moa and I have never truly fine tuned it. Good enough for the gophers.

 

[Dos XX]

This is not 6BRA related, but it is primer related.

I ran a really wide progressive load test on a brand new .260 once. I was breaking the barrel in and needed to get some rounds through it, so I loaded up a wide progressive load test with H4350 using Fed and CCI primers with identical loads. I ran all the shots over the LabRadar. I was really just trying to get the barrel past the speed up point and see if I would find pressure signs so I could do load work. When I do that, I shoot them over the LabRadar and kind of watch for patterns.

Anyway, on the low end of the powder charge test, one of the primers shot smaller and had lower ES/SD. However, while working up, at a certain point that flipped. The other primer shot smaller and had lower ES/SD. Since this was during barrel break in, I decided to repeat it during load work after the barrel was broke in. It repeated almost exactly. I thought it was interesting.

 

[JohnMill]

Getting pressure with 30.6 h4895 with a 105 seated 5k in the lands. Stiff bolt and ejector marks. Not sure what’s causing that. Groups aren’t bad.

Also had pressure fireforming with 29.5 h4895.

Any ideas?

Edit: ejector mark not extractor

I'd sure get them out of the lands. There is an ever so slight a possibilitythat you are more than .005" in. pick up a .005" feeler gauge. I call mine 10 off or 10 in cause I got to call it something but it is a hard-to-measure.

 

[Falfan2017]

I'd sure get them out of the lands. There is an ever so slight a possibilitythat you are more than .005" in. pick up a .005" feeler gauge. I call mine 10 off or 10 in cause I got to call it something but it is a hard-to-measure.

This turned out to be caused by a bad carbon ring.

 

[Falfan2017]

Using a new barrel now. Seemed to like a very low node. Doing 6br speeds around 2860 FPS.
29.6 grains h4895 wolf srm with the hammer jammed. Wind got one in the second group it was a 10-15 mph day.
also a seating depth test 3 shots at 100 yards.