4" barrel. I don't think so either but some of the faster loads are with H110 - which usually require near top loads for best accuracy. I use alot of 2400 because it holds accuracy better with less than max charges.
Yeah if you have it, start with 2400. No need to throw flames when you are only after 1000fps or so, even with the heavies. I'd take 2400 to the top end and see how it does before going to H110, were it my project. Nice gun you have there.
