358156 hp
At large, whereabouts unknown.
Winchester White Box? It wouldn't happen to be 115 gr ball would it? Most 115 gr bargain ball ammo sold in this country anymore is low quality, underpowered crap. It's being manufactured to hit a price point thats competitive with el cheapo imported ammo, and quality suffers. I've seen evidence that some lots of WWB is being manufactured abroad, even Winchester uses overseas subcontractors to load bulk ammo for them. My advice would be to clean and lube the pistol and try 124 gr or heavier ammo in it to see if the issue persists. Long ago I gave up on 115 gr ball in favor of 124 gr & heavier because I had so many feeding issues. Now I don't have any. Try different ammo, 124 gr ammo is often recommended by gun manufacturers to test malfunctions before guns are shipped back to the factory only to be returned with a nice tight group on a test target with "cannot duplicate the issue" handwritten below.