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Old 02-06-2013, 23:43   #3
judgecrater
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Join Date: Dec 2011
Posts: 154
I have been substituting mag for regular in 45ACP. No problems. I called Federal to get their opinion. They said no problem regarding pressure, just that the cups are a little harder and may cause light strikes in some guns.
If they work in your gun, you are good to go.
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