I picked up a Ruger M77/44 Carbine and I'm wanting to get it ready to serve its purpose, a fast brush and car gun for under 100 yds

At this point I'm looking at over the counter loads for it and Id like something hardcast incase I find myself using it on a bear. Recommendations? I've heard that some of the larger heavier loads don't stabilize out in and or work in the rotary mag that comes with it? Anyone have any experience with this? I like the look of the 305 gr hardcast Buffalo bores but don't want to buy them and find out they don't even fit in the gun.
thanks!
Side note I topped it with a a Leupold 2.5-8.