Grinder, my own handloads. I don't buy ammo, I make my own. Not really comfortable giving my recipies. They work safely in my guns, maybe not yours. I will say that I use 748, 55 gr V-Max, Lake City brass, and Winchester primers in the Mossberg. My Tikka takes 40 gr Nosler BT, 335, Winchester brass (neck sized,) and Remington primers. It will shoot one hole at 100 and a 45 caliber hole at 200 for 5 shots fairly regularly. The Mossberg does take all my concentration and a little luck with the original trigger. I'm sure the Timney will fix that so I can get back to enjoying a good cup of coffee at the range.