Quoted:
I have a bunch of G20s, like 8 or so.
Over the past year have tried:
Storm Lake x 2
KKM x 3
Lone Wolf x 4
NONE of the barrels will reliably feed Buffalo Bore or Underwood 220gr full power hardcast, through any of my G20s. Multiple lots of ammo. I have sent barrels back to KKM and Lone Wolf to have the chambers "opened up for reliability" and made no difference.
Tonight I was shooting a Lone Wolf threaded and it was choking on Federal Trophy bonded 180gr JSP. Decided to try a box of Buffalo Bore 10mm 220gr "Tactical Low Recoil" which is about 200fps slower than their full power stuff. That ran 100%.
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All I can tell you is that for my 10mm G40, I decided (at least for now) to forego the aftermarket barrel ritual just to shoot "heavy & fast" hardcast loads.
I simply handload the heavies using SNS's
coated 220gn HC boolits over either AA-7 or AA-9. My loads with the AA powders get into the 1200fps range. With the coated hardcast boolits, there are no leading issues, and I've gotten 100% feed-reliability, great accuracy, and the barrel cleans up quick and spiffy.
That said, the two or three of boxes of BB's 210 HC 10mm ammo I ran through the factory tube of my G40 shot just fine, with no lead build-up. Wouldn't hesitate to load any one of my 10mm Glocks with those if I was facing a long duration in the backwoods or boonies.