Today I was in Sportsman's Warehouse with one of my son's & I was looking at the cost of some factory ammo & was kind of shocked since I never buy any factory ammo. You guys that are in the know can probably tell me what the difference is in performance between Grizzly 335 gr +P cast 45 ammo & Cast Performance 325 gr +P cast 45 ammo. The difference in price was HUGE! The Grizzly was $19.99 for 20 rounds & the Cast Performance was $35.99 for 20 rounds! Is there that much difference in performance? Neither box said gas checked.