I bought 500 270 gr .375 blems many years ago. I wish I had bought a whole bunch more. It really depends on what you're shooting them from. I have about half a .30 cal can of 147 gr FMJ pulldowns that do just fine in my M1. I'd have no problem buying 9mm seconds, or .224 seconds to feed a Mini-14. Accuracy is not really a thing there. I'd inspect seconds pretty closely before I used them. I have not been able to find a good deal on blems or seconds in the calibers I use for quite a while, though.