I've been reloading .45 ACP for a while now with 4.8gr of Titegroup under 230gr lrn & jhp's. One thing about that powder is that the velocities are a bit slower than other powders but the pressures seem to run a bit more. Question for you all. Do higher pressures help in the functioning of a semi-auto? With the 4.8gr I estimate velocities are in the 780fps range. Not blazing speed by any means but my 1911 likes 'em and functions like a champ.