I am not sure of the difference if there is any between the old FMJs and the new Deep 6 FMJs, other then the obvious . My experience is only with the Deep 6. I think they royally suck balls and if I wasn't hunting em in less then a week I'd be chucking em all in the burn pit. About a month ago I started strictly shooting broadheads out of my bows and I would get some flyers and after playing with shit came to realize some of my arrows were bent, causing these flyers. Threw 2 of them. These were normal use non hunting practice arrows.. On top of that, ive been shooting into a Glendell and let me show you these FMJs don't like anything hard in those targets. 2 more arrows down the shitter in the last couple weeks. Funny thing is I don't recall all these issues shooting carbon. And 5miles is right I bet if people spun test them more they wouldn't be happy
After this year I will forever be staying away from anything FMJ. Each their own though I guess.