I dunno what it is about cast lead and polygonal rifling. But it gives me the heebeejeebies. In the manual you get the usual legaleze, weasel words and ass covering:
Any modifications to the gun void the warranty
Shooting reloads voids the warranty
Shooting cast lead in the gun voids the warranty
Cheating on your score card voids the warranty…
I have been assured by any number of knowledgeable shooters that hard cast lead is not a problem in guns with polygonal rifling and they do it themselves all the time with no problems. 99.9% of the ammo I shoot are reloads. Corporate and legal paranoia are a big downer in this sport, so much so that most of us pay lip service to it - but that’s it. I don’t mess around; if I need a trigger job my gunsmith can do the job. And all my ammo is reloaded and safe, and easily as good as the factory stuff. Of course I will lie and cheat on my score card! That’s half the fun of it!
But for whatever reason, the cast lead thing makes me uneasy. I fired 20 through the big HK and then soaked it in a lead solvent… and the patches came out looking like….GAH! All that brown stuff on the cleaning patch is dissolved lead. Maybe I need to cast my boolits harder? That’s a lot a lead to be pulling out of a gun with only 20 rounds through it…