Not quite your question - but I went to buy some 45 for my XD45 I just bought (I am shooting it this week)... I use nothing but Blazer in my 9mms. I have shot thousands of rounds thru it.
However, when I went to my local Academy store, they wanted $19.99 per box of 50. I generally don't use WWB, but 100 rounds of that in 45 is less than $29. I was floored. So, for 45 at least - I won't be a shootin' any aluminum Blazer.