I should clarify something I said in mine. The ONLY seconds I have ever gotten were .308 for my .30-06's. Several hundred and pretty much all of them were off on weight (175gr average with some being as low as 172). That's why I assumed they were seconds. I never actually noticed any "appearance" differences in the ones I got. But as I said previously, It is rare to find them in the Interlock. Usually you see the seconds in the 150gr FMJ's and HPBT's. I use them whenever I am working on breathing and trigger control. They fly close enough to my higher end rounds for 800 at a 16" gong to be "good enough" at a MUCH cheaper price. Makes the wife happier that way