I don't believe that load is recommended for a factory barrel. Unsupported chambers have done bad things to Glocks with the buffalo bore loads I have heard. No real experience but have seen pics of blown up guns. Cast bullets also do not agree with the polygonal rifling. Got a G20 myself. Nice shooting BTW.
1+ on this responce.
Had a model 20 blow out at the unsuppored part. I was shooting Masters ammo loaded for KSP, and some other state police organizations back in the 80's, they (KSP) did not have to worry about it as they were shooting S&W 1006. I had a lot of this ammo so I went with a KKM barrel, now no worries with it. I was not hurt to bad my hand stung for a while as it knock the mag release the oppisite way into the palm of my right hand. Sent the gun back to Glock they sent it back with complete new lower. I was satisfied, and the gun shoots like a target pistol with my KKM. I would say you would be safe as long as you shot it and left the brass lying. Would not try to reload, and shoot with an unsupported barrel. JMHO.
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