Took it out to the range yesterday, 20 degrees outside but I had the range all to myself, so I don't have to wear my ear pro.
Even with a short 45 can, it's still hearing safe comfortably with Federal 36gr bulk pack supersonic ammo. I have couple 22 cans in NFA jail now, I had to make a fixed barrel spacer to fit the AAC TiRant 45M.
My Butlercreek mags don't like the cold, they work fine in warmer weather. Factory BX25 mags all worked good with only couple dead priming rounds.