I recently bought a Glock 22(40S&W) that I plan to handload for. I compared the barrel/chamber support area to my H&K USP 40 & did not see any noticable difference in cartridge support. I have shot reloads in my USP that I thought had the same type barrel groves. For reloads I load 'plated' bullets to a modest velocity,(165 grn H Univ. for powder). The Glock came my way via a family discount, if not for that I was very content with my USP.
At 1st I planned to get an after-market barrel, but after some research I plan to use the factory for my reloads. I am also a relatively low volume shooter & clean after each outing. I can understand the warnings but that is my plan. I have some 165 grn GDHP's factory loads if I need full power.
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