The winchester partition golds are the way to go! i had a half inch group at 50 yards inch at 100 2 inch group at 150 and the at 200 yards i had a three in group!!!! They are so accurate best slugs ever.
I also agree with m2 slugger. Your gun doesnt need to be cleaned after every trip to the range. Ive dropped deer at 200 yards with a winchest surpreme slug (works best with my gun) with the bore "dirty".
Im twelve years old and I have a benelli R1 and M2 and they both are great. The R1 is a 300 win mag non comfort tech and I have no problem shooting it. That would make the benelli R1 cheaper. I hope this helps.