Polygonal rifling!

[gunfan2]

Is it safe to shoot Powder coated cast bullets in a handgun with polygonal rifling? I have a new H&K 45CT which has that sort of rifling, I'm assuming that it is ok, but we all know what assuming can do for us!

[sigep1764]

As long as the fit is good, there shouldn’t be issues. Fit is king. Seat the boolit, crimp, then pull it to see if it’s the correct size still. Lubed or coated makes no difference. I’ve shot both through a few glocks without issue.

[Sasquatch-1]

Never had a problem in my Walther PPQ.

[1006]

My HK USP 40 would not shoot moly coated or Berry’s copper plated bullets accurately unless the velocity was kept below 1000fps. The Berry plated bullets literally “flew apart”. I would find several small holes in my target rather than a single round hole with the Berry Bullets.

The 45acp might be a different story, given its low velocity.

The twist rate of the barrel, combined with the rifling type is what I believe created the problem for me (H&K USP 40).

[ioon44]

I have been shooting Hi-Tek coated bullets out of Walther PPQ's (9mm & .45 ACP) for serval years without any problems.

My bullets are 11BHN to 12BHN and are sized .002" to .003" over bore da. Fit is king.

Walther barrels are true polygonal rifling Glocks are not.

I tried Powder coated bullets, Hi-Tek coated is better.

[Half Dog]

That’s one of those issues where some will say yes and others will say no. I would wonder if the risk is worth the reward.