I am in the final stages of a project which may require the use of a paper patch boolit. I believe velocities will run in the 1,800-1,900+ fps. range. All I have is plain base moulds, and I have never had any luck getting much more than 1,600 fps. without loss of accuracy.
I have slugged the barrels at .510". If I was to get a mould cut, what size under this is recommended for paper patching? Would you recommend a smooth sided, or grooved boolit? Thanks.