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Bullet fit is a big part of it but the cylinder throats are important also on a revolver. A lot of folks i think that have a big leading issue are either loading them too slow or too hot to get that type of build up in the barrel. You should never fire a jacketed round after cast unless the barrel has been cleaned out first. Jacketed bullets create more pressure as they dont give like a cast bullet does. In a barrel thats already fouled bad it can cause those types of accidents to happen. I often shoot 100 to 150 rounds of lead 44 mag bullets and it dosent take me 30 min to make the entire gun look new again afterwards.
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