Anyone having issues with frontier (plated) bullets

sandman

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Y'all, I have been using frontier (copper plated) bullets in 9mm and .45 for many years now. I recently have had a problem with the 9mm 124g fp bullets. It seems the copper jacket (which should be bonded to the lead) is separating around where the crimp is thus making a second hole in my targets at close range. I mean the top of the projectile outer case is perfectly separated....
I thought it my be my crimp (roll) would be too tight, but this shouldn't affect a bonded bullets like frontier.
Also, if this matters I'm now using a Glock 34 instead of my 17 (where this problem never arised).
If anyone has had this happen, let me know as I will be contacting frontier to ask for a refund.

Unfortunately I have about 3K loaded and cannot trust them in a match due to the duel projectiles.
Please advise,:confused:
 
WTF! You taper crimp 9mm. A roll crimp is far too aggressive. All you need is the case mouth bell rolled back flush with the bullet, plus maybe .0005
 
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