Flash hole deburr,chamfer or not?

O

OMJ

New member
I have been load testing on a new rifle that is a Bat action and a Bartlein barrel. Forming cases test this and then that.
I ordered some case prep tools from a well known supplier and was going to order a flash hole deburr , chamfer tool for Lapua cases and the person told me that I didn't need to because the flash holes were drilled and if they had a burr it would be removed after a shot or 2.
I flash hole deburr and chamfer all of the other cases that I use and was taught that this makes the flame from the primer more uniform?
I know I made this too long "sorry" but this bugs me!
Should I go ahead and get the deburr tool and proceed to prep my Lapua cases?
Thanks for your thoughts...
Jack
 
It is a good thing

To de-bug yourself and de-bur the holes. It will make you feel better and give you something to do this winter. I do mine; all of them. I figure it can't hurt anything. Who cares rather or not it absolutely necessary ? :)
 
Omj

The folks at Sinclair told me the flash hole on Lapua is punched from both sides and that you don't have to deburr. I do it anyway. I just like knowing I've left nothing to chance, and I like fiddling around with the brass. Besides, you only have to do it once for the life of the case.
 
Jack, I have always ran a Sinclair .063 flash hole uniformer into the cases as a part of the neck turning process; however, in recent weeks, I have concluded it is not necessary.

The flash holes in the Lapua 220 Russian cases are very well done. Whether they are produced by drilling or with a punch I cannot say, but they are perfect right out of the box. As close as I can measure, they are .059. This is a little small for most decapping pins, and that is the main reason I have always drilled them out to .063, but in recent times, I have found it is better to grind down the decapping pins rather than drill out the flash holes.

The dies for the 220/6mm Beggs cartridges are made by Hornady, and the decapping pins measure .055. If one uses the no-neck-turn version, it reduces case prep to a minimum and that is,,, removing them from the box. :D

Gene Beggs
 
Jack -

My 6BR Lapua cases all had a little tit of brass occluding the flash hole. I just used a #53 drill bit (measures .059) to punch it out. I used the shank end. Left the hole diameter unchanged.

I haven't inside deburred yet, but was thinking of using a Possum Hollow tool and dressing down the bit portion, so it only served as a pilot. Just a light chamfer... May not even be worthwhile - these cases don't seem to be nearly as gnarley here as other brands.
 
I use a normal fatter diamter flash hole tool and give it a few twirls on the inside of the flash hole with a very light pressure.

That is enough to break the edge and remove any burrs but doesn't mess with the nice job that Lapua have already done making the nice small holes.

Most cases do nothing but just break the sharp edge but the ocassional one will have a small burr that breaks free.

The amount of brass shaving on the bench after 50 cases indicates I am probably wasting my time but it is a little peace of mind and doesn't take long. Do it with the new unfired brass and you can see inside a lot better to see the result of your handywork !!

Bryce
 
Flash holes

Better to deburr and chamfer and not need it than to need it and not have done it. PEACE OF MIND will help shrink those groups.....................
 
I never use a deburr-chamfer tool on my Lapua brass, on any of it. Each Lapua case is a perfect little gem.................Wingnut
 
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