70 - 100 grains loose T7 for me. Never seen the need to shoot more....

I only have 1 load that is max and shoots lights out and one that is over Westerns max recommended that shoots very very well. All the rest are well under both the powder and rifles companies max loads.

80-100gr is usually hard to beat with the right sabot and bullet.

I shoot a 209x45 "magnum" T/C, with 100gr load.
The gun can handle 150gr., but that doesn't mean I HAVE too.
Shoots great and kills like lightning out to 100yds as is.