BrownBear said:I'm not sure whether it's the opening that is required, or simply the smoothing that results from opening. On the last one I did, I just polished the inside of the cup with little change in size and it helped.
Loco Mato said:what is the load that you are using. Generally there is to much back pressure and it adheres to the hammer do to heat . if you are using a hot shot maybe the nipple hole is to large
Gus said:One tool I want to try though is a cartridge reloaders primer pocket brush, meant for this kind of thing.
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