I don't know how much shooting you guys do but even the other day one guy using a low grain bullet a jacket came a part
i am assuming you are talking about 1/7 barrels?
up until this past christmas day i would have just written this off as another one of those things
ive heard, but not seen, (ive actually been quite critical on this claim here in the past) but on christmas, we loaded up some 45g varmint bullets (sierra's varminter bullets). they were not even loaded to max pressure. 27g of varget, chrono'd, at 3300fps. more on that in a minute.
LOL, they looked like little grenades. anywhere from 10-50ft out they would pop and look like a little firecracker going off in mid-air. you could even hear it.
back to the chrono. we started checking velocities before we started trying to hit anything with them. (and before the 1st one "poofed")
1st one chronographed @ 3313, 3323, and the 3rd one "poofed" right over my alpha chrony and busted one of the shades......... at first i thought my brother had shot my chronograph, but as we inspected it, it looked like someone chewed up a lead fishing weight and spat it all over the inside of the chrono, and thats when we realized what happened.
we started shooting them and watching it closely, and at least every 3rd to 4th one did it. if we shot faster and warmed the barrel it seemed to get worse.
if i didnt see it i would have never believed it (ive said everything here short of calling ppl liars over the subject before. to whomever i was talkign to, my apoligies, i was wrong)
out of a 1/7 barrel, they were