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Just following on from previous post, with both the Fox and Peregrines we have recovered a few in water traps. The rifling is only in the driving bands, and not in the body of the bullet, so the actual contact area with the barrel is less than with a traditional bullet. This results in lower pressures required to get traditional velocities, or if using traditional pressures we are getting higher velocities.
I'm not an expert but I don't think the problem of monometals is pressure. It's whether the give in the projectile is adequate. Grooves only don't cut it in my opinion. Not for me anyway.
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Re: Swift A Frame Bullets for old rifles