Twist Rate For 175 ABLR

[luv2safari]

New here but I'm old and am on other forums. I love Nosler bullets and started reloading in 1959 for 30-06 and 7mm Wby mag.

I have a Kimber Mountain Ascent + Peak on the way in 7 Rem Mag. These have a 26" 1:9.5 twist rate. I want to shoot 175 ABLR for my NV elk hunt this November, but I'm a bit hesitant, since these have a relatively slow pitch. Launched at 3,100 FPS using Grand powder, which I find excellent in over-bore rounds and especially in my 6.5 PRC with 142 ABLRs, will the 9:5 pitch stabilize the 175 ABLR? Shots could exceed 400 yards.

I thank you in advance.
L2S

 

[RL338]

Berger has a good bullet stability calculator.

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

 

[JD338]

Welcome to the forum.
The 175 ABLR might be a tab too long to stabilize in a 9.5t. The 168 ABLR could be an alternative.

JD338

 

[luv2safari]

Berger has a good bullet stability calculator.

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

Thank You! I just did the calculation and it rated 1.57...good to go.

 

[luv2safari]

Welcome to the forum.
The 175 ABLR might be a tab too long to stabilize in a 9.5t. The 168 ABLR could be an alternative.

JD338

Yeah, but the 175s blems are cheaper.

 

[TEXASforLIFE]

Thank You! I just did the calculation and it rated 1.57...good to go.

Might recheck inputs to match ablr's length with the 9.5 including estimated temp and altitude.

I did this
Used 195 elite hunter snd changed length to 1.54 (according to nosler site info), changed weight to 175, 5k feet of altitude, 40° temp and 3,100fps.

What got was 1.49

30° at 6k was 1.51

The colder the temp toned either more speed or more altitude for the 1.5 minimum if you don't have something with a faster twist.

 

[TEXASforLIFE]

Here's my results for my 7saum

 

[TEXASforLIFE]

I put the bottom amount in to see how low it could go and still meet 1.50. Answered above^^^^^^^^^

For a closer to actual speed outcome it would be closer to 2,900-2,950 as that's what a 28" barrel.