I am new to neck turning. I use a k&m tool and a cordless screwdriver, about 300 rpm. I am getting very rough necks when I turn the brass. I have tried going slow, have tried hand turning, have tried steel wool, tried putting the neck turner in a vice rather than holding both parts and I still have ridges on the necks that catch a fingernail. I know this is no good.

Any suggestions? Tricks of the trade? I am turning lapua brass (.260) from .0155+\- .005 to .014-.0145. I would like them to be .0145. Using k&m expanding iron, cut to length, imperial wax on the neck turning mandrel and inside the case neck. I am still just trying to get clean cuts before I get real picky about it the dimensions.