When you switch from one style of jacketed bullet to another, the main thing that had to change is the COL. You need to work out the COL appropriate for your gun and each individual bullet you reload.
What I do is compile all the reloading manuals and loads from Handloader magazine into a single spreadsheet. So, the following is my total information for 185gn jacketed bullets and Universal powder. Do not believe my compilation but go to the bullet or powder manufacturer's site or other reloading manuals to verify.
.45 ACP
Bullet Weight Powder Weight Velocity Start/Max Power Factor COL
J-SWC 185 Universal 5.8 Target 1.260
J-SWC 185 Universal 6.0 908 Start 168 1.195
J-SWC 185 Universal 6.4 977 Max 181
J-SWC 185 Universal 6.4 977 Max 181 1.195
GD-HP 185 Universal 6.9 851 Start 157 1.200
JHP, JSP, JFP 185 Universal 7.2 993 Max 184
GD-HP 185 Universal 7.7 991 Max 183 1.200
I have no XTP data, but one always starts with the lowest starting load they find. The 5.8gn is a target/bullseye load that SHOULD be more than safe in any modern, well made and maintained gun properly chambered for .45 ACP. I believe this to be a Handloader load.
Establish the longest COL that works with your gun and a given bullets.
You will noticed that, with the specific equipment, components, and barrels used by two manufacturers, the Max loads are actually less than another manufacturer's starting load. This is why I started compiling all the data I had so I could always start at the low end of the starting loads. So far, I have never found one of these starting loads to be so low that the gun didn't cycle.