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there has probably been more 45 auto ammo shot down range with bullseye then all the other powders combined. Ive used it in many thousand 40s too. 4.5 and a 180 work fine in my guns. I cant figure why it would be an excellent powder in the 45 and to fast for a smaller case. Now if i a guy is looking for full power loads theres proably better powders but for accurate range loads its hard to beat.
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This is from another post on CB but here is how my 40 perfoms with cast.
http://castboolits.gunloads.com/atta...3&d=1300854267
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so is the sizing right for the size of the barrel?
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Typicaly, in my somewhat limited experience, .001 over bore (groove) diameter is sufficient for handgun boolits.