I've shot 1000's of hard cast 180 grain SWC through my G20 (10mm). These were make major loads for IPSC and range pickup brass. The whole steel target stand would move across the ground, kicking up dirt when the plate was hit. The 9's sometimes would not even knock these plates down. Never had a problem with leading or blown cases, etc.
Just use a reliable hard cast bullet company like Bear Creeks, or go with one of the aftermarket button rifled barrels.
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Just use a reliable hard cast bullet company like Bear Creeks, or go with one of the aftermarket button rifled barrels.
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