Lapua flash hole de-burring.....

[jriggs]

curious as to your favorite ways to remove that burr without opening up the flash hole at all. i was going through my new Laupa last night and there is a good bit of them with burrs...so i figure i'd see how you guys are fixing it. i think i'll just go with a Sinclair deburring tool and guide.

thanks in advance,

riggs

 

[SmokinJoe]

Any of the tools with the .062" pilot drill should be good. You actually do want to open the flash hole just a couple thousandths to make'em uniform & smoothe.

 

[jriggs]

Any of the tools with the .062" pilot drill should be good. You actually do want to open the flash hole just a couple thousandths to make'em uniform & smoothe.

thanks for the info Joe...i'm looking to keep the flash hole to the original specs though. so i'm just looking to clean up that little burr that Lapua left me as a gift

 

[duanepa]

How about just the tip of a much larger drill bit, say 1/4"? Give it a little twist & plink it out of there. Just a thought. DW

 

[artbosco]

your favorite ways to remove that burr without opening up the flash hole?

DO NOT use the UNIFORMER or REAMER: http://www.sinclairintl.com/.aspx/pid=36020/Product/Sinclair_Flashhole_Reamer____0625

Use the DEBURRING tool only: http://www.google.com/search?q=RCBS+Flash+hole+deburring+tool&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-USfficial&client=firefox-a

There's a big difference.

I found that the RCBS has a finer tip which doesn't ream open the flash hole like the others, but you can't apply a lot of pressure when removing the burrs. Just a little pressure is all that's needed and a couple revolutions.

The RCBS case pilot helps a lot too.

 

[hawghunter]

Check out the daily bulletin a 1.5mm pin drill bit fits the .059 flash hole

 

[KenO]

I use the Lyman tool, it has an adjustable stop so you can dial it in for what you want. I just did 200 Lapuas, didn't get much burr, but when done I had quite a few tiny chips. Nothing like the LC brass I did earlier.

 

[artbosco]

Any of the tools with the .062" pilot drill should be good. You actually do want to open the flash hole just a couple thousandths to make'em uniform & smooth.

There's a new school of thought on the 6PPC's .059 flash hole that's being promoted by Jack Neary, the latest inductee into the Benchrest Hall of Fame and Tony Boyer, which through extensive testing, with Tony's rail gun, has determined that the original unreamed Lapua 220 Russian brass performs better without opening it up and uniforming it to .0625. Tony covers his thoughts about deburring, and not reaming, in his new book on pages 151 and 152.

Many other cartridges may and have benefited from reaming as mentioned above.

 

[Forum Boss]

The problem with reaming, even to 0.0625+ is #1, a lot of the tools cut oversize, #2 it tends to leave the flash hole walls a little rougher, and #3 if you go quite a bit oversize, you will need to adjust your load.

I'm wary of most of the tools that go in the neck because they use a counter-sunk bit that will over-cut and create a divot on the inside if you are not very careful about insertion depth.

I can't comment on the 0.059 vs 0.0625 experiment, but Neary's results don't surprise me, because I have found that, with most tools, it is actually difficult to make better holes than the factory does. You do need to push out those crescent flakes than may obstruct the flash hole.