7mm wsm twist rate

[grouse]

I have a 7 wsm savage with factory 1-10. Seems to be shooting pretty good but haven't gone to anything above 162. Think this twist will hold up to longer heavier bullets?

 

[elkaholic]

Not very well! You can run a 9 with some of the 180's, but most people get an 8 now with all the long, heavy bullets available.....rich

 

[FEENIX]

I have a 7 wsm savage with factory 1-10. Seems to be shooting pretty good but haven't gone to anything above 162. Think this twist will hold up to longer heavier bullets?

That depends on how fast you can push it and what altitude you're at or your hunting grounds. For instance, I have .300 WSM with 1:10" twist and the Berger 215 calls for a 1:9" twist. I am pushing it at 2750 FPS out of 24" barrel"

@ 0' altitude, SG is marginal at 1.47 (1.5 or higher is ideal).
@ 3333' altitude (my home/range) SG is comfortable at 1.67.
@ 7500' altitude (elk hunting grounds) SG is comfortable 1.95.

Try http://www.bergerbullets.com/twist-rate-calculator/

Good luck!

 

[grouse]

Thanks. If i push the velocity I could get away with 175 at 5000 and up.

 

[FEENIX]

Thanks. If i push the velocity I could get away with 175 at 5000 and up.

That's the ticket ... good luck!

 

[heimdd]

I have 2 with 9 twist, I shoot the 180's

 

[FEENIX]

I have 2 with 9 twist, I shoot the 180's

You should be able to as Rich noted.