I had a 7 twist AR-15 that did "overstabilize" at least one shorter 50gr bullet.
Could have been a flaw in the bore but I did not see any. And I guess that lot of bullets could have been messed up somehow.
But I did experience the bullets rapidly disassembling themselves and spraying shrapnel on my targets.
With 12 and 9 twists, never had issues.
It's the gas port, as it relates to bullet jacket. Worst offender may be the old Remington PLHP. Have thousands, both 50gr and 55 gr. All my A1 1:12s tear them up, as do all 1:7 A2s. Doesn't matter if the barrel is new or about shot out. My Daewoo K2 does the same, as does a 1:9 Stag. Wouldn't surprise me if Blitz or SX bullets gave similar results, but don't know.
Frequency varies by barrel. Best case is an occasional flyer in an otherwise very nice group.
