300 WSM Medium Action Build input

DMULE · Sep 10, 2024

N8Nobull said:
I am currently in the process of building a 300 WSM. I have a SS Proof M24 1:10T currently at LRI to get the murder hornet fluting done and a Zermatt/Big Horn Origin Medium length with Hawkins DBM and mag on the way. I know I am a little restricted with how heavy bullet I can run with the 1:10" twist, but I plan on having the barrel at 22" and hoping to be in the 2800fps range. I figure I'll run 190-210gr projectiles, such as the 190 ABLR, 195 ELD-M, 200gr ELD-X, and 205gr Elite Hunters.

Curious on input if I'm on the right track, and what freebore or reamer specs might be recommended for this setup.

This is also the first forum I've signed up to be on, so I'm a rookie to this, but I have built several custom rifles, so I'm not totally ignorant.

Thanks,
Nate

NATE

DMULE · Sep 10, 2024

DMULE said:
NATE

Nice compact 30. From your list 200 Eldx or 180 AB if Elk in your path to attempt those velocities.

TVPTA7 · Sep 10, 2024

Velocity might be tough with the heavier rounds. I have 26" on a tikka with the long action magazine. 200 gr Berger hybrid 2940 with h4831.

mdmiller · Sep 10, 2024

Welcome from Illinois!!
You will find what you need here!!!

ARlife4me · Sep 10, 2024

Most if not all hunting bullets will work fine w/10 twist. Getting beyond 210 might need the 9, but brand requirements vary. The xm action is just fine fir the heavies, but make sure which mags can be used as some get to 3.250ish and others are just over 3". The metal mags gives you more length to use.

johnc427 · Sep 18, 2024

I run a 300 WSM in a XM Anti/20" carbon six and it pushed 200.20x at 2805 fps. Right around 3.210" and a stiff load of RL23.

N8Nobull · Oct 7, 2024

I finally got my barrel back from LRI, and I am utterly impressed. This fluting cut out a ton of weight! Action and barrel are at Red Desert Rifles to get spun up now. I gave Chad a dummy round with a 205 Berger EH seated at 3.150 COAL for chamber dimensions. All I need now is a stock and she'll be ready to run once Chad gets it chambered. I'd really like to find a Manners LRH or maybe a McMillan Game Hunter or Scout.

Beluebow · Oct 7, 2024

A 10 twist will do everything you need it to do...N555,H4350,RL16,RL23 are great powders in the 300WSM. A .215 freebore will let you shoot any bullet from the Berger 220 on down....the 230gr takes a lot more FB IMO.

300 WSM Medium Action Build input

DMULE

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DMULE

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TVPTA7

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mdmiller

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ARlife4me

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johnc427

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N8Nobull

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Beluebow

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