Glock doesn't do a very good job supporting the case head with their Gen 4 10 mm pistols. The polyagonal rifling is not optimum for use with uncoated lead bullets. Most G20 owners purchase aftermarket barrels for use with heavy loads.
Might be worth using a heavy recoil spring for the bear loads and a lighter one for normal 10. I'm a big fan of the M&P 2.0 platform. If I were in the market for 10 mm pistol I would be very interested in one of these pistols
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