348gr powerbelt over 80 and 90gr pyrodex P. 250gr barnes expander in MMP-12 sabot. 240gr xtp in the same sabot and both driven by 90-100gr Pyrodex P with a Winchester W209 primer.

Havent shot the 270 plats yet but when i do i'll see if i can find an accurate load.

Buy some loose powder and start with about 70gr pyrodex p or RS. I'd stay away from T7 as it will more than likely leave a crud ring and have to be swabbed between each shot.