300 wsm: 1-10, 1-9.5, or 1-9 twist

Freediver111

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Minuteman
Feb 28, 2018
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34
Oregon
I’m sticking to the 200 grain bullets and heavier for this gun. Mainly looking at trying the 212 Eld-x and 215 Berger’s, preferably the 212 Eld-x.
My gut is thinking I should be ok with a 1-9.5 twist for both of those bullets, but not sure what the general consensus is. I have heard of the jacket coming apart on the Hornady ELD-M with too high of a twist, but not sure if that’s just internet rumors.
 

223762

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Mar 23, 2013
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Get a 9.5 twist. Well probably be in the 2700-2750ish range for velocity. You are in the lower 200k for RPM. Also look at getting 5R over conventional 4 groove. The 5R well help with jacket failures.
 

mmlj

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Jul 22, 2011
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If possible, try doing some research on what twist other competitive shooters are using in your caliber. Discussing this with barrel manufactures may also provide some insight. My 300 WSM is a hunting rifle with 1-10 twist and I've never seen the need for anything over 200gr. for the animals I hunt. However, the old adage of going with a faster twist considering the bullet weights up to 240gr., etc. might be a better choice.
 

Freediver111

Sergeant of the Hide
PX Member
Minuteman
Feb 28, 2018
219
34
Oregon
If possible, try doing some research on what twist other competitive shooters are using in your caliber. Discussing this with barrel manufactures may also provide some insight. My 300 WSM is a hunting rifle with 1-10 twist and I've never seen the need for anything over 200gr. for the animals I hunt. However, the old adage of going with a faster twist considering the bullet weights up to 240gr., etc. might be a better choice.
This is going to be a hunting rifle, but will cover primarily moose, elk, and bear. Sure you can kill a moose with a 180 gr, but I prefer to pack a heavier bullet in the 200-225 range when grizzlies are around.
 

CRT2

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Jul 7, 2013
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Central Ohio
Berger Twist Rate Calculator shows 1/10 twist for 230 gr target hybrid at 32 degrees, 4500 feet and 2750 FPS. Below 4500 feet bullet would be less stable, per their calculator.
 

BruntBronze

Private
Minuteman
Oct 8, 2019
63
15
I’m sticking to the 200 grain bullets and heavier for this gun. Mainly looking at trying the 212 Eld-x and 215 Berger’s, preferably the 212 Eld-x.
My gut is thinking I should be ok with a 1-9.5 twist for both of those bullets, but not sure what the general consensus is. I have heard of the jacket coming apart on the Hornady ELD-M with too high of a twist, but not sure if that’s just internet rumors.
id go with 9.5 twist, without knowing your barrel length, so the heavier pills can be used.
 

BruntBronze

Private
Minuteman
Oct 8, 2019
63
15
since 24" will have less mv then the 9.5 twist. i asked the company that made my 308 if the would replace the barrel, at my cost, for one with a 10:1 instead of 11.75:1...they laughed.
 

wade2big

Knowing just enough to be dangerous
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Sep 16, 2017
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My 26” .308 win is a 1-9” and shoots factory FGMM 175gr at 2750fps into small clusters. If I was going to build a 300prc, 300 wm, or 300wsm, it would be a 1-9”. If it won’t over spin the lighter stuff then I couldn’t imagine a 1-9” overspinning the heavies.
 

SingleShot85

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Jun 28, 2004
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spanishgourd.com
Have been running 10 twist for years 150s-200s. There in no since running anything over 200 grains in a short mag. The velocity loss is just not worth it. You cross the 200gr mark just step up to a full length magnum. But that’s just me