Before I started loading my own I was using 270gr jfn buffalo bore 44 mag ammo, they worked great on deer and hogs. Hornady 44 mag xtp bullets work well also.
That was the first thing I started hunting when I was a kid and loved it. I still break out the Buckmark at least a couple times a year and go after them.
I shot Thunderhead's for many years and switched to Muzzy a few years ago, The only reason I switched was because they shot better with the arrows I'm using. I'm fletching up some new arrows and will use the one that shoot's the best.