It's the powder. Trust me. I have used Federal Champion ammo in 45 ACP, it does the same thing. No worries. Shoots fine, just the powder they're using.
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1911 Pistols can be additive! 
COTEP CBOB0586
No freeman shall be debarred the use of arms.
Thomas Jefferson
“Laws that forbid the carrying of arms...disarm only those who are neither inclined nor determined to commit crimes... Such laws make things worse for the assaulted and better for the assailants; they serve rather to encourage than to prevent homicides, for an unarmed man may be attacked with greater confidence than an armed man.” Thomas Jefferson
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