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hornady · February 23, 2010, 08:27 AM

In cast bullets you want to be at least .001 over bore diameter. Having said that, The only way to know your bore diameter is to slug the barrel. Like reloading there are several things that effect cast Bullets.
A little known fact that alludes many casters. Bullet alloy plays a major part in bullet development. Many wrongly believe that if they have leading they add more tin to harden the Bullet. And if not Sizing this will work some times. Not because of the harder bullet. But because the more Tin added. The larger the as cast bullet will be. Which in some cases makes up for the under sized bullet. There are guys that shoot pretty soft lead up around 1200 FPS. With minimal Leading. But they have put a lot of work into. Bore size, Alloy, lube and powder.

February 23, 2010, 08:27 AM	#5
hornady Senior Member Join Date: April 6, 2009 Location: SWPA Posts: 428	In cast bullets you want to be at least .001 over bore diameter. Having said that, The only way to know your bore diameter is to slug the barrel. Like reloading there are several things that effect cast Bullets. A little known fact that alludes many casters. Bullet alloy plays a major part in bullet development. Many wrongly believe that if they have leading they add more tin to harden the Bullet. And if not Sizing this will work some times. Not because of the harder bullet. But because the more Tin added. The larger the as cast bullet will be. Which in some cases makes up for the under sized bullet. There are guys that shoot pretty soft lead up around 1200 FPS. With minimal Leading. But they have put a lot of work into. Bore size, Alloy, lube and powder.