.308 169 grain Sierra Match King. Required twist to stabilize?

[aklaunch]

Howdy all,

I had an old 11 twist barrel that i was going to give these a try in. I gave up on that barrel and sent it back... 1st time i have ever done that, and hopefully the last time.

In an extreme effort to get it right this go around i ordered a Kreiger barrel with a 1:12 twist for my AR-308.

It arrived today, and i was measuring bullet lengths, and distance to the lands on all of the bullets that i have on hand.

Going off memory (DON'T TRUST) the 175 grain SMK's are around 1.245 or so, and the new 169's are a touch over 1.3.

I think it will be close? But could work?

 

[6.5SH]

Not sure is a ton of info to be definitive on that. Some 1:12 shoot 175's just fine others hate them.

Here is a thread with results out of an original 1:12 AI barrel:

169 SMK

That’s a 168, 169, and a 175. I’ve had a chance to shoot these. Sierra has done well. I’m using 44.4 grains of Varget and getting around 2,750.

www.snipershide.com

 

[StrayDog]

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

1-10 or 11 would theoretically be better, but how far you shooting? 1-12 might be just fine, but hard telling not knowing until you shoot em.

 

[Dot3]

I shoot them in a 13 twist 30-06 at around 2840 FPS. DA around here can be as low as -1800 and I’ve had no problems whatsoever. Haven’t had them thru transonic but they stabilize fine. Give them a go if you can get your hands on some

 

[Expert684]

Base to ojive changes from batch to batch. I run 168 and 175 .003” off the lands. But you need to be dead nuts on.1-12 or 1-11 will work fine.