This is about using minis in my 62 caliber rifle. Somebody mentioned in a barrel like that, the minis needed to be an exact fit. But I don't know what that really means.

I slugged it and the dimensions are .625 and .594

If I have a custom mold made, exactly what diameter should the mini be for this bore? .58 caliber is available in many forms (some .575), but aren't those too narrow?

Blooie