38 S&W w/ TB?

[Guesser]

I'm casting 358246, drops @ .3605, 147 gr., pan lubing, plan to load unsized. I'm not finding Trail Boss load data. Open to help from any source, suggestions please.
These loads will be used in a S&W Regulation Police of 1935/36 vintage in excellent condition. Factory duplication is what I need. Thanks.

[blpenn66502]

Trail Boss isn't recommended in the 38 S&W or at least it wasn't about a year ago when I called Hodgdon/IMR - they said there was insufficient case capacity.

I settled on using around 3.5 gr Unique for both a 148 gr W/C and 160 gr SWC that gives pretty good accuracy from my S&W Victory and fair accuracy in a Webley.

[Guesser]

I wondered about that when I was Looking for data. And then I weighed, measured and filled Starline 38 S&W and Starline 38 Short Colt cases and they are identical except for head stamp and there is recommended TB data for the Short Colt. Guess I'll stick with Bullseye, my favorite anyway.
Thanks.