I usually go with 1.25" on any round nose bullet. Most published data is in that neighborhood. Any 230gr round nose is going to have pretty much the same volume for a given OAL. Stick with the published data and you'll be fine. The .45ACP is a low pressure round anyway. As mentioned, no need to go near maximum loads. I've found that above 4.6gr of Bullseye LRN & Berry's Plated bullets started "patterning" instead of "grouping."

Bullseye powder's been around longer than I have. I started with it because it's one of the most popular powders for the .357 & .45ACP I load. LOTS of data available for it. And a little goes a long way. Lots of loads per pound. It's dirty, though, & I've been messing around with Green Dot. Not as popular, but the published data I've found lists loads pretty close to Bullseye.