SINCLAIR INTERNATIONAL - Flash Hole Reamer, 0.081"

I use this to square up all my 6mm BR Lapua brass primer pocket flash holes.

I am using this on new Lapua 6mm BR Norma brass. These cases use a small primer flash hole. The hole varies from about .059" to about .063". A quick twist with this tool makes each case about .063" or just under. Having every case nearly the same certainly can't hurt accuracy when your trying to gain every little advantage you can. Also a small decapping pin is .0625" and a person can use a decapping die (with the small pin) after reaming the cases with this tool.

Received reamer and used it on 250 cases initially without a flaw, worked perfectly. Additionally, it make evident several cases in which the primer pockets were not straight. I checked and my gun screwdriver set had an Allen key that fit perfectly should it ever need to be taken apart.

The small decapping pins fit tight in the 6BR Lapua brass flash holes and sometimes pull the pin out of the decapping die. This precision tool opens up the flash hole slightly keeping it square to the primer pocket. This should solve the problem.

With un-crimped good brass it works well. The existing flash hole needs to be well centered and pretty close to 0.080 for this to work. It's only designed to remove a few thousandths on already decent flash holes. It does have 4 cutting edges with good cleanout grooves for the small size so its hard to clog it and damage the hole but it still doesn't deburr or taper the inside edge. The deburr tool I use almost does this tools job as well but because it cuts to 0.081 it still has a purpose. I would suggest using this reamer first and deburring second to insure clean uniform flash holes. I have used this reamer and my deburring tool on match grade custom brass of every brand and they both still further refined even the most expensive offerings.