You're not loading much more powder under 200-grainers than I load under 240s in my bowling pin loads, which are the only .45 ACP loads in which I use 4756. I'm a big fan of the powder, but it only shines at relatively high pressures, and your unburned powder is a sign of low pressures. I don't offhand recall the exact weight of 4756 I'm putting under my 240gr. lengthened H&G 68s, but it's over 7.5 gr., I believe. I'm running the 240s at about 960 fps. from my Wilson 5 1/2" barrelled comp gun. And no, you won't find that load in anyone's manual. I promise that it is +P or more, so don't go do anything foolish and blame me!
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