My senior year in highschool 1969,I also purchased a Rem Mod.591 5MM Mag. What a great little gun. And It broke my heart whem Remington stoped producing 5MM ammo. For many years my little Remmy was nothing more than a safe queen, Then about 2 months ago I was at my favorite gun shop,low and behold,there on the ammo shelf was Centurion 5MM Mag ammo,@ $22.00 a box of 50. I bought 2 boxes,drove home ,pulled that little 591 out of the safe, cleaned it up,and headed for the range, What a big let down,accuracy was gone,5" groups @ 50 yards. The new ammo is junk, How so you ask ? I still have 2 1/2 boxes of the old Remington 5MM ammo. I took some of my old Remmy fodder to the range the following day and fired 5 rounds @ 50 yards, and viola 3/4" groups at 50 yards. I'll wait and see ,maybe Big Green may start making 5MMs again,or possibly Winchester,Hornady,Federal ,I certainly hope so ,I really enjoy shooting Groundhogs with the 591.