My experience matches yours with the 115- and 124-grain Blazer Brass being satisfactory every time I've had occasion to use it. It seems to be loaded considerably hotter than the aluminum-cased stuff with reliable cycling and ejection.
I've used the aluminum-cased Blazer ammunition only once, had to have been better than 30 years ago and my memory is that it was loaded very anemicly and caused problems with the gun that it was used in. I guess that some things never change.