300 wsm twist rate for 212-215 gr bullets

[freediver111]

So what is the general recommendation for a 300 wsm shooting either 212 eld-x or 215 Berger hybrids? No planning on shooting anything under 200 grains in this gun.
I’m leaning 1-9.5 twist, possibly a 1-9 but read some internet rumors the jacket on the ELD-M bullets have come apart on some people using faster twist rates. I think the ELD-X is a heavier jacket over the M, so I should be safe. Curious what some of you are shooting in your WSM’s using the 200 gr and up bullets. Thanks!


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[Brightwhite]

My 1-9.4 twist shoots the ELDX 200gr bullet very well. Mine is a build off a short action from Hells Canyon and Mike suggested that barrel twist for 180-200 grain bullets that I wanted to shoot. I did not inquire about the heavier ones.

 

[freediver111]

My 1-9.4 twist shoots the ELDX 200gr bullet very well. Mine is a build off a short action from Hells Canyon and Mike suggested that barrel twist for 180-200 grain bullets that I wanted to shoot. I did not inquire about the heavier ones.

I was looking at Mikes website and it seems he recommends a 1-9.5 twist for the 300 wsm/win mag. That’s what lead me to lean that way. If I was looking to exclusively shoot the 215 Berger’s I’d likely go 1-9, but maybe the 1-9.5 is a good compromise if I end up using the 212 eld-x.


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[Dhbwa]

1-9. Can’t twist it to tight.....(within reason).....

 

[tdhanses]

1:10 or faster for 215’s.

 

[Tumbleweed]

1:10 or faster for 215’s.

1:10 is marginal. B/C will be compromised


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[tdhanses]

1:10 is marginal. B/C will be compromised


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Works just fine for me at 1000ft, any higher and it is rock solid but yes i wouldn’t go with a slower twist.

Also I’m just basing this on Berger’s stability calculator but maybe they are wrong and you know more But Berger tells me mine is stable even at 1000ft.

My 300wsm is slinging 215’s at 2,963ft/s, slow I know but still pretty stable out of a 1:10.

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

 

[Tumbleweed]

Works just fine for me at 1000ft, any higher and it is rock solid but yes i wouldn’t go with a slower twist.

Also I’m just basing this on Berger’s stability calculator but maybe they are wrong and you know more?

My 300wsm is slinging 215’s at 2,963ft/s, slow I know but still pretty stable out of a 1:10.

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

Nope. I use the Berger calculator as well. The 1000ft is probably what's just getting you there.


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[tdhanses]

Nope. I use the Berger calculator as well. The 1000ft is probably what's just getting you there.


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I get a full stable, not many elk below 1000ft I know of. Really it’s my velocity getting me there.

 

[freediver111]

I’m shooting moose at sea level, and elk, bear, mulies at 3,000-9,000 ft.
Based on further research and talking to folks, as a dedicated heavier pill 300 wsm, I’m going with a 1-9.5 twist. Tempted to go 1-9, but I think 1-9.5 will work well and still give me a option to drop to 200 gr if needed.


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[tdhanses]

I’m shooting moose at sea level, and elk, bear, mules at 3,000-9,000 ft.
Based on further research and talking to folks, as a dedicated heavier pill 300 wsm, I’m going with a 1-9.5 twist.


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Really you can’t go wrong going faster then 1:10 but my 1:10 is even stabile at 0ft above sea level with 215’s. You shouldn’t have any worries at 1:9.5.

 

[tdhanses]

In the 300wsm you do have to reload as there are no factory loads for the 215’s, checkout the unknown munitions thread as there is good info there for your load development.

300 WSM with Unknown Munitions

Hey Roksliders! I just shipped my 300 WSM over to @Unknown Munitions for their full load development service. I'll post on this thread as the process goes along to let you all know how it goes. So far the plan is to use Hornady brass (only option right now) and Berger 215 Hybrids.

www.rokslide.com

 

[freediver111]

In the 300wsm you do have to reload as there are no factory loads for the 215’s, checkout the unknown munitions thread as there is good info there for your load development.

I’m a dedicated reloader. I never shoot factory loaded ammo unless I’m desperate for brass or need to do a barrel break in.
I really want to use H1000, but it’s impossible to find at the moment. I have three pounds of H4831sc, 10 lbs of h4350, and 3 lbs of RL19 on hand. Thinking the H4831sc will work in a pinch until I can get my hands on H1000.


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[tdhanses]

I’m a dedicated reloader. I never shoot factory loaded ammo unless I’m desperate for brass or need to do a barrel break in.
I really want to use H1000, but it’s impossible to find at the moment. I have three pounds of H4831sc, 10 lbs of h4350, and 3 lbs of RL19 on hand. Thinking the H4831sc will work in a pinch until I can get my hands on H1000.


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RL26 really is the best powder I’ve found for any wsm, it’s just the perfect powder for thes short fat guys.

 

[freediver111]

RL26 really is the best powder I’ve found for any wsm, it’s just the perfect powder for thes short fat guys.

I tried RL26 with my 6.5 and had issues in variable temps. Used to have 12 lbs of it but traded it for H4350. It’s a great powder for speed, but I had issues with stability over temps.


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[tdhanses]

I tried RL26 with my 6.5 and had issues in variable temps. Used to have 12 lbs of it but traded it for H4350. It’s a great powder for speed, but I had issues with stability over temps.


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Weird, I shoot it from 0* to 90* with little change but if you didn’t like it you didn’t, with the other powders you may get 2850ft/s which will still be good out of a 1:9.5. RL26 is about 100ft/s faster then any other powder I’ve tried.

With my 6.5creed I’m getting about 50ft/s faster over h4350 with RL16, I’m pushing 156’s at 2700ft/s, I bet RL26 would be closer to 2750.

I should clarify, I’m not knocking your experience with RL26, I’ve just yet to experience it and I’ve been using it since it was released, I’ve burned closed to 50lbs of it and I’m sitting on 26lbs currently. I will say I bought 8lbs of RL16 in a pinch and it’s been impressive as well.

 

[Clarktar]

I'd opt for 1:9, a little faster won't hurt anything. If there was 1:9 available and a 1:9.5 available, same quality etc but one was less expensive, I would opt for the less expensive choice.

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[762 ULTRAMAGA]

What speeds are guys getting from the 300 wsm with 215s and 212s throated long?
Also please include barel lengths.

To the OP I'd go with a 9 twist, I've shot the 215s in an 8 twist 300 Norna mag at 3050 with great accuracy

 

[tdhanses]

What speeds are guys getting from the 300 wsm with 215s and 212s throated long?
Also please include barel lengths.

To the OP I'd go with a 9 twist, I've shot the 215s in an 8 twist 300 Norna mag at 3050 with great accuracy

26”barrel 2963ft/s, another member with a 24” is get 2945ft/s. There’s a thread in reloading for unknown munitions 300wsm.

 

[Wrench]

I just killed a bull last week with a 208 from my 1:10 Montana. That rifle would not shoot the 215 as well as the 208. My faster 300's in 10 twist shoot the 215 well with my rum getting substantially sub moa to the mid 1000's.