The only problems my SP-01 has ever had was several failure to feeds from the stock 18 round mags. I only use the flat 16 round mags that come with the 75B, which I believe are mec-gar and have no problems at all.
I also wouldn't think the temperature would have any effect to be honest. I could be wrong but unless we're talking extremes in weather id rule that out.
I only use S&B 124gr for my CZ pistols and have been for about 3 years now, and I do feel like the most recent stuff I bought didn't perform per usual, but without actually testing it I cant say that for sure.
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