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I just got a .257 Wby Mag. It seems to be a pretty wicked round. The problem is the cost of the ammo. So I guess I got to start reloading. Any one have any recipes for this round.
 

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I would use the 120 grain bullet. This bullet has fine sectional density and decent bc in a .257 diameter bullet.

Try 65.0 grains of H4831. This should produce about 3200 fps.


Mad
 

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Probably.


But you would have to measure the bullet and plug the bullet length into the barrel twist formula:


Bullet length in calibers multiplied by twist rate in calibers equals a constant, 150. ( This is the Greenhill formula.)


Measure the length of the bullet in inches. Divide this length by 0.257.


150 divided by the bullet length in calibers equals the twist rate in calibers.


Mulitiply the twist rate in calibers by .257 and you will have the rate of twist in inches for your barrel in order to stabilize the bullet.



Mad
 
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