6BR twist rate

[46490]

Is there a clear path for determining the proper twist rate for different weight 6mm bullets used in the 6mm norma br?

 

[rwj]

This one has worked well for me… I’m sure there are others!

Twist Rate Stability Calculator

Our newly updated Twist Rate Stability Calculator not only tells you what your SG is, but it also lets you know if you are reaching your optimized BC.

bergerbullets.com

 

[rkittine]

I typically just look at the Berger recommended twists for their specific projectile weights,

 

[JEFFPPC]

Do the calculators as suggested, you will get some surprises.

 

[Kracken McGraw]

Is there some thoughts that for 105 type bullets and the 6br being a little slower than it’s variants, the 7.5 twist might work best…..

 

[JB10]

I have a 1:8 and shoot 105's

 

[rwj]

Is there some thoughts that for 105 type bullets and the 6br being a little slower than it’s variants, the 7.5 twist might work best…..

Definitely for the Berger 105 Hybrids!

 

[SecondsCount]

I have a 1:8 and shoot 105's

Ditto.

 

[ranger3]

My 1:8 shoots anything from 70 gr. To 105's well.

 

[hoz53]

Is there a clear path for determining the proper twist rate for different weight 6mm bullets used in the 6mm norma br?

you can use the tables/calculators to find a twist to match your bullets but practically speaking 8 and 14 are the two most common.— there are some going a little faster to say
7 1/2 and 13. you need 8 or faster for the 105 up but an 8 will usually shoot many different weights. people use a 14 who want to use lighter bullets exclusively and want to get the absoulute accuracy out of them - usually in the 65 to 70 grain range mabie 58 to 70

 

[rkittine]

I barreled my 6BR with 1:8 but if I had it to do over again, I would consider a 1:7.5. The 1:8 works good for me with projectiles from 90 to 107 grains

 

[marchx]

Is there a clear path for determining the proper twist rate for different weight 6mm bullets used in the 6mm norma br?

I have 1:8 twist and I run berger bt 90gr, 95vlds, 105 hybrids and 105scenars. No stabilisation problems at all.

 

[moondog]

I've got a Krieger.7.5 twist on one of mine now to try. It has been more finicky to get to shoot. The 8 twists have shot better for me. 90 grainers up to 107s

 

[Dgd6mm]

Mine is a Criterion 7.5" twist and shoots 105 bullets very good with minimal load development.

 

[Bill Norris]

I did a powder test a few weeks back with my 6BRX 1 - 8 Tw. and 68 gr. Bergers to try VV-N135 and the best group was .153 @ 100 yds. with 33.7 gr.


68 GR. BERGER FBHP M 1.751 O M 2.236 COL T/L B S .333 B C .255
POWDER TEST 32.9 33.3 [33.7] GR. VV-N135 PRIMER CCI 450M
SEATED @ 1.741 O M 2.226 COL .010 OTL .267 BUSHING

 

[Forum Boss]

1:8 Twist worked for me out to 600 yards with 105s and 107s, with standard 6BR with 2910 muzzle velocity. NOTE: that's running conventional (non-VLD) bullets in a 3-groove barrel that's considerably faster than average. I also run a 1:8" twist in 6BRDX running 105s about 2970.

 

[hoz53]

I did a powder test a few weeks back with my 6BRX 1 - 8 Tw. and 68 gr. Bergers to try VV-N135 and the best group was .153 @ 100 yds. with 33.7 gr.


68 GR. BERGER FBHP M 1.751 O M 2.236 COL T/L B S .333 B C .255
POWDER TEST 32.9 33.3 [33.7] GR. VV-N135 PRIMER CCI 450M
SEATED @ 1.741 O M 2.226 COL .010 OTL .267 BUSHING

i know they say you cant overstabiliize a bullet- thats if its a perfect bullet— its interesting to hear you shot a 68g in an 8t. 80 berger is the smallest i have tried and they shot well. i have various 70s i will try. I think i have some of those 68 bergers to. thanks Bill

 

[Dgd6mm]

The 75vmax shoots super accurate in my buddy's 8 twist 6br. Prairie dog killing combo.

 

[Downhill]

When I found this site, the concept of the 6mm BR consumed me. Own 4 now. 8 twist for the heavies. The 10 twist is amazing with 80 and 88's. I run the 66 through 75's in the 12 twist. And lastly a XP 100 with a 15" 12 twist running 68's ( poker chips at 300 yds is a blast with this one!). On a side note the 8 twist shoots very well with just about all weights.

 

[Idaho-Lefty]

Mine is a Criterion 7.5" twist and shoots 105 bullets very good with minimal load development.

Yup, Same Barrel / Twist, I used, on my 6 XC and it shoot's, Berger or, Sierra, 80 gr Varmints, 95 gr. Classic's and 108 EH's, Into, the .2's and .3's ( One Ragged hole ) and about, as good as, my older, Eye's can do, .. anyway !
I haven't tried any, 70 grainer's, YET.
Doubt that, you could, go "Wrong" with, EITHER, Twist !
The 1-8 Twists were, Out of Stock, so "Gambled on", the 1-7.5 and I am quite, Happy !