Have to go along with several others here. Use both, and find out what works best in the gun your shooting. Mag primers can be used in place of standard, several reloading manuals I have basically state, start your loads at the bottom of chart, and work your way up. And, after 20 years of long range handgunning in IHMSA, I to, would like to see one hole groups at 100 yds. I've seen some pretty good shooters take out shootoff targets at 200 meters, that would be something to witness. gypsyman