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Message: <blockquote data-quote="Shadowrider" data-source="post: 2982307" data-attributes="member: 3099">Lyman Cast Bullet Handbook recommends .001" over groove dia. as a starting point.  .0015 is ideal in a lot of guns.  The idea is to let the barrel "size" the bullet to itself that way it's sealed with no gas cutting past the base while it's in the bore.Some of the old .45LC single action guns back in the day were all over the place with their groove diameters.  Seems every manufacturer had their own idea of what it should have been.  That's where slugging your barrel mostly came from as it was basically a necessity for years in that caliber.  Now days they all make them to the standard and the precision is almost perfect.</blockquote>