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For velocities above ca 800-900 fps I only use jacketed bullets to prevent leading. I have never been able to successfully drive lead bullets at ca. 1000 fps or above without experiencing leading.
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Mercy.
I was running some TVB LSWCs this weekend from a 4" GP-100 at 1400 fps (got to love Lil' Gun!
) without a
hint of leading. OTOH, I've also leaded the heck out of guns at just over 900 fps using the same bullet and Green Dot. Even Hornady
swaged lead bullets have gotten up over 1200 fps for me w/o leading.
Lots of variables, of course, but you should not have any problem with cast bullets at much higher velocities than this.