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1:70 twist sounds like Forsythe rifling, meant for propelling round balls with heavy charges. The problem is that no matter how fast they start out, 50 caliber round balls only retain about half their muzzle energy at 100 yds. Just too much air resistance, especially when launched at sonic speeds. A conical will retain energy much better down range, but starts slower and with a heavy charge may develop too much pressure and recoil for accurate shooting. Unless there is a need to shoot beyond 100 yds at deer size game or larger, I'd stick with the round balls.
 

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I have shot them in GM barrels and find them accurate. They shot better with heavier (90+) powder charges. I did not like the extra recoil, so I'm still using the patched roundball. I find iron sights to be the limiting factor on how far I can shoot in the woods.
 
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