ive shot the 45gr winchester varmint rounds and the 45gr remington pmc hollow points and the 55gr winchester silvertips through mine, all shoot great although my 22 250 groups best with 55gr silvertips can get a three leaf clover at 100yds the 45gr rounds shoot well too but ive never tried shooting a group with them.
ive never had a shot a bobby so i cant help there but ive shot prairie dogs, prairie gophers, rock chucks and coyotes with all three and all of them were pretty devastating there wasnt much left of the p dogs or gophers even at 300yds and none of the coyotes were salvagable. the last coyote i hit was with the 45gr. rems while it was doing the spin after my buddy winged it, i hit it just infront of the pelvis and practically gutted it at about 70yds.