For those interested in the couther sink bit method, here is a few links from the many "hacks" out there.
https://www.calguns.net/calgunforum/showthread.php?t=639374
http://castboolits.gunloads.com/showthread.php?185868-anyone-use-a-countersink
https://www.ar15.com/archive/topic.html?b=6&f=42&t=391503
Lyman actually makes one that does the same thing, but by hand.
http://www.midwayusa.com/product/682934/lyman-primer-pocket-reamer-tool
Same with Hornady
http://www.midwayusa.com/product/804809/hornady-primer-pocket-reamer-package
Redding, they even mention chucking it up in a drill
http://www.midwayusa.com/product/664266/redding-primer-pocket-uniformer-tool-large
Spend a little, spend a lot, Work smarter, Work harder.
Your choice
https://www.calguns.net/calgunforum/showthread.php?t=639374
http://castboolits.gunloads.com/showthread.php?185868-anyone-use-a-countersink
https://www.ar15.com/archive/topic.html?b=6&f=42&t=391503
Lyman actually makes one that does the same thing, but by hand.
http://www.midwayusa.com/product/682934/lyman-primer-pocket-reamer-tool
Same with Hornady
http://www.midwayusa.com/product/804809/hornady-primer-pocket-reamer-package
Redding, they even mention chucking it up in a drill
http://www.midwayusa.com/product/664266/redding-primer-pocket-uniformer-tool-large
Spend a little, spend a lot, Work smarter, Work harder.
Your choice


















































