Also, any idea on how to cure the <black powder> effect? If my loads creats lots of smoke, would decreasing it change anything...
Mike, With TG, cutting back will increase the problem. TightGroup loves presure...
At lower levels, your load will get flakey and groups will fall apart. At higher presure (upper end near max) TG cleans up very nicely, the smoke goes away, and the group size gets nice and small.
"What slower-than-TG powder should I be testing under my 147's?"
Weshoot, I have had great luck with 147's and VV N-340. I have tried 231, WST, WSF, N-320, TG, Bulls Eye, Unique....
TG is nice for a fast impulse with jacketed rounds, but when it comes to LEAD, slower powders are the clear winner. Any of the aforementioned powders will work, but My favorite so far is the N-340.
It really boils down to what you are looking for in accuracy and recoil impulse.
I like heavy lead loads with Slow/Med speed powder for a moderate/slow recoil impulse. (The eyes are not as fast as they used to be).
Later,
Bert