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Gun powder residue from blowback??
I noticed when i was shooting the other day that my cases are getting alot of black residue on them after i unload the cylinder.. i am shooting out of a s&W 686p .357 mag revolver.. i noticed that there is hardly any residue with a stock round but with my reloaded rounds its turning the cases black.. i am using H110 reduced 3% from min load with a medium crimp and the bullet is not jumping so i see no need to crimp more.. is this blowback normal with mag load??? of 20 grains
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