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Well, I looked into this one, and, like so many statements aimed at the 458 WinMag, it appears to be incorrect.

The Rifleman's Rifle, by Robert Rule, considered to be "The Bible" concerning the pre '64 Winchester Model 70, states that testing ammo for all calibers, (velocity pressure and accuracy) was done with 26 inch test barrels.

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That has always been my understanding as well.

I was told once and read once, that one of the problems early on for the .458 besides the horrible bullets initally used, was that the machines rotating the powder filled brass would catch and spill a portion of the powder out of the brass before the bullet was placed --not sure how valid that is/was..but that is another piece of info I had read...

Personally have a .458 also and do NOT have a problem reaching 2200 fps with 500 gr bullets..

Ripp

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