Barrel twist

[jimbires]

here's an article on twist rates relation to stopping power , in handguns . I thought it was worth the read .

An Official Journal Of The NRA | Spin Difference: The Impact of Barrel Twist Rates on Terminal Performance

When most shooters think of rifling-twist rates, they mostly think of rifles with their high BC projectiles, but the rpm of a bullet also plays a part in terminal performance.

www.americanrifleman.org

 

[xphunter]

Good Stuff!

 

[Blkram]

Agree with you, and I am also excited about the quarter bore bullets coming out. Just finished a 25 CM with 128 ELD-X bullets. Shoots great with high BC value. Using Shilen ratchet with 1:7 twist on a 24” tube proven to be very good at long range.

Would love to hear what loads you were trying in the 25 CM with the 128 gr ELD-X!
Haven't found actual load data for this bullet yet, but am looking at trying VN555, H4350, Re-16, StaBall 6.5, and Superformance.

Have you tried the any of the new Sierra 131 gr TGK yet?

 

[TexasLife]

Would love to hear what loads you were trying in the 25 CM with the 128 gr ELD-X!
Haven't found actual load data for this bullet yet, but am looking at trying VN555, H4350, Re-16, StaBall 6.5, and Superformance.

Have you tried the any of the new Sierra 131 gr TGK yet?

Here ya go and all the powders you asked for

 

[TexasLife]

i'm awaiting on a 25creed AR barrel (7T) and have 128edl-x, 131smk (not tipped) and a few others (128's are the lowest weight i have that's cup-n-core) including barnes 100tsx-bt's for some high speed which could get me over 3,300fps with the 26" barrel (+3 gas).

 

[Blkram]

Here ya go and all the powders you asked for

Thanks!
Appreciate it!

 

[jimbires]

I stumbled into this Berger FAQ , while looking for other info . thought you guys might be interested . I knew match shooters used minimum twist rates , but didn't know why .

Why do you recommend the slowest twist?​

Spinning a bullet faster than necessary can amplify any inconsistency in the bullet. Since we use J4 jackets, you can shoot Berger Bullets in faster twist than what is listed. We list the slowest twist rate needed because we want to squeeze every bit of accuracy out of a rifle.

 

[FOTIS]

I read a lot where folks are going to faster twist barrels to be able to shoot longer bullets. So what is the downside and how do you know the limit? I understand caliber plays a part as does velocity but are there guidelines?

Here you go.

Plug in your #'s and play all you want.

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

Places like midwayUSA and ofcourse google will provide bullet BC/length etc. Much easier than trying to rehash all the twist stuff on here.

 

[Idaho53]

Would love to hear what loads you were trying in the 25 CM with the 128 gr ELD-X!
Haven't found actual load data for this bullet yet, but am looking at trying VN555, H4350, Re-16, StaBall 6.5, and Superformance.

Have you tried the any of the new Sierra 131 gr TGK yet?

I just finished load development for three different 25 CM (all have the same spec's with the Shilen barrels) Two are shooting 42 grains of H4350 and one is shooting 41.5 grains of H4350. Absolutely no pressure signs with Peterson or Hornday brass. All three rifles produce 1/2 MOA (one is shooting 3/8) with muzzle velocity at 2900 to 2940 fps. All three are shooting 128 ELD-X with Federal 210M LR primers.