Others may chime in, but the search might have answers that you seek

http://www.hkpro.com/forum/hk-handg...k-handgun-talk/266121-vp9-crushing-2016-georgia-state-uspsa-championship-3.html

I for one, load blue bullets.....have not put any down polygonal rifling.......yet. I plan to, then I will assess.

You might find info in the 'new' reloading section.

 

You talking about the Fed red lipstick? The polymer's supposed to keep your barrel cleaner. It functions like a copper jacket would, but better. Again, supposedly.

 

I've used thousands of various polymer coated bullets in Glocks and HKs with no ill effects. They shoot just fine.