In my 1911 1,400 rounds blazer no problem, but then again I hand fit this gun myself and I bet it could load a rock if you could get one to stay in the magazine!!HAHA
My M&P 40 all blazers 2,500 rounds, no issues at all!!! then again it's a 40 and i have only had one gun in 40 cal to give me loading issues.
my fathers M&P 9 1200 rounds, all blazers no issues!!
My M&P 45 150 blazers a ton of FTF, but on the other hand changed to WWB and no issues at all!! matter of fact, i find it is super smooth at feeding WWB.
Some other guns I have owned have been like this before (picky on the ammo they like). However, I find after shooting them some, the issues go away.
For example, I had a Styer that shot every type of ammo under the sun, but just didn't like blazers and sometime would jam up and set back the bullets in there case. Good thing they jammed the gun up because its never a good thing to shoot 40's that has a bullet seated to deep in a case( it causes a spike in pressure)