I own three guns that I want to use cast boolets in and after reading several articles, I'm a little confused on what diameter boolet to buy. I want to purchase some at first to see what works best for me and I am hoping that i can use the same bullet for all guns. I slugged all of the barrels and cylinder throats. The first is a FA model 83 with a cylinder throat of .4525 and groove diameter of .4525. Next is a Rossi M92 carbine that slugged at .452. Last is a new Bisley Blackhawk with cylinder throats at .453 and groove diameter of .4505. With the Bisley there is a pretty tight restriction that I plan on working over by fire lapping.
I've heard everything from going with the the cylinder throat diameter to .002 over. I like to use a 255 gr pb bullet for plinking and then have been using 300gr jacketed boolets for hunting deer, black bear and carrying for brownbear protection. It sounds like there are some advantages with using cast for my hunting/protection purposes and want to try some out. I would like to try some lead in the 325-335 gr and in the revolvers I want to run them in the 1100-1200fps and my carbine usually gets me another 300ish fps more. Should I use gc or can I get by with pb boolets? What diameters should I try first? .452, .453 or .454