Quote:
Originally Posted by Bearcat74
I have used everything from 15-20grs of 2400 and 7.0-10.0grs of Unique and a massive dose of 5.0-6.0grs of Bullseye. The leading is usually the first 1-2" of barrel from the forcing cone up, the cone has been recut and smoothed out also, I had my smith recut it to a better angle and he polished it out smooth.
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I believe your loads are not heavy enough, or your bullets are too hard...with a caveat: I think your throats are sizing the bullet down too much, and you don't have enough pressure to cause the bullet to obturate to the bore until it's well into the barrel. Softer bullets and/or more pressure is the fix.
I had this same issue with my RCBS 44-250-K and 7 grain of Bullseye. I was water dropping the bullets, making them too hard. Softer bullets (aircooled) resolved the issue immediately.
I'd suggest checking you chamber throats. If they size down the bullet WAY too much, then it doesn't matter what bullet you use short of a hollow base, they're not going to slug up well.