For what it’s worth….
I have been loading Donnie’s 147 grain FP’s with 3.5 grains of TiteGroup
Have notes where I increased the OAL to 1.150
Been shooting them in an STI and a Sig MPX, could probably go softer but damn they slam the steel plates
Here comes the disclaimer-Don’t blindly follow any reloading recipes on the web without working up your own ladder