No luck. I just went to Hodgdon's site and the max for W572 under a 147 gr XTP is only
1,147 at 34.700 psi. Of course, that is 200 fps faster than you can get a 147 XTP going in
9m Para, so not bad. And it is the fastest powder in .38 Super at that weight.
Hmm. They do not show +P loads for W572, and not for cast, which, IME will go faster than
Jbullets much of the time, on the same powder charge. They show 5.9 under the 147 XTP as
max, I was using 7.1 of W571 under a cast 147 LSWC, definitely at +P pressures, 36Kpsi, IIRC.
Might still get there with W572 and cast.
Another new powder, IMR Unequal, will beat W572 with a 147 gr XTP! They list it at 1175 fps, closer
to my old W571 load. I will need to learn about IMR Unequal.
Great example of how Lead is superior.
.38 Spl, std pressure. IMR Unequal, 158 XTP. Max is 4.2 gr for 777 fps.
IMR Uequal, 158 MEI cast, max is 4.6 for 966 --- both loads at 16,500 psi.
This makes me think that with the 147 cast and IMR Unequal, I may well be able to
bump up to 1250 from the 1175 that they get with the 147 XTP. I have a few pounds
of W571 remaining, this may be my replacement.
Bill