Some use TG for max loads but with my 6" 357 magnum with a
full load of Green Dot with a 158gr LSWC I can manage 1281fps.
Universal and Unique will do over 1300fps and I did not try 2400powder
since I though this was fast enough for a lead target loading.

Just depends if you want to dump more powder into your cases
for an added 100-150fps.

Have fun.