With my g20 the only time I have a problem is with the Lone Wolf barrel or hand loads. If I have the stock barrel in and run store bought or hand load ammo it is flawless. Have been running Sig 180 grain in the lone wolf every chance I get trying to get the barrel broke in, Sitting at about 800 rounds down the pipe and it still will not run hand loads. May end up sending it back and getting them to open the chamber a smidge. Really gave up on the lone wolf barrel for hunting season after I figured out the factory barrel runs the 200 grain lead TC coated just fine.
I have an 80% build G17 with Swenson slide and barrel and get 90% reliability with factory ammo and about 65% with hand loads.
Needless to say, that's a range toy only.