I have noticed some shooters are using small magnum pistol primers for Idpa and USPSA 9MM loads. Please help educate the ignorant. Is there an advantage to be had using magum vs regular small pistol primers. I only reload 9mm on my 650 and my loads are used for practice and will be used in match's this season. All I have ever used in the past has been N320 powder, MG 124gr RN, Winchester or Federal small pistol primers and usually Winchester or Federal cases. Am I missing out on something.