I read a post a few weeks back about using a brass screw in a drill to smooth up the crown. How do you pick the screw size and what shape head? What cutting/lubricating fluid should you use? Any help would be appreciated.
I've done it on a couple of rifles and it worked fine improving groups sizes. I used a slotted brass screw about 1/2 again larger than the bore with extra fine grinding compound. I plugged the bore about 1" back with tissue to keep the stuff from dribbling down the bore. The brass screw was chucked in a drill.
The only tip to remember is to rotate the drill in a circular motion over the bore instead of holding it still kinda like stirring a spoon motion. This will help keep the work centered.
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