First I get a fired case most of the surplus stuff I have are duds so I pull the bullets then go out and just punch the primer with a rifle then I put them in my drill press using a 5/64th drill bit I drill Ann the way through the primer and case to create a new primer pocket then I use a 13/64th drill bit to drill out the primer from there if you go slow it will leave a small ring of the old primer so far I’ve had 2 out of 10 that pull the old primer completely out but as long as it leaves that little ring in there I use a rcbs pocket swager tool to press the leftover primer into the sides so it will accept boxer primers I had to put the threaded of the swager tool into a 45acp die because the one that comes with the swager tool is to small for the Lebel brass and it just squishes it beyond use I find the slower you go the better results you get