Primer pocket prep

[UL1700]

So a few years ago when I stated my journey into F class, a box of 308 Lapua brass was purchased, then sized, primed, charged fired, repeat. Now with various calibers and the brass being trimmed, turned, cleaned and sized in dies that cost more than my 1st rifle I realize that the primer pockets are still as they left the factory. With my local range (Lang Lang) once again closed due to Covid19 it has got me thinking what could I be doing to improve ignition performance and what tooling is recommended to do it accurately?

Cheers

James

[ajvanwyk]

I use a primer pocket uniformer from PMA, available at Hoplon Precision. Have used K&M and the adjustable 21st Century models.... absolutely love the PMA and use it after ever firing.

You can also uniform and debur the primer pocket. Here I found the K&M , available through BRT or SARA to work better than other models.

[UL1700]

You can also uniform and debur the primer pocket. Here I found the K&M , available through BRT or SARA to work better than other models.

Do you mean flash hole

[ajvanwyk]

You can also uniform and debur the primer pocket. Here I found the K&M , available through BRT or SARA to work better than other models.

Do you mean flash hole

Yes.... that is what I meant

[UL1700]

Yes.... that is what I meant

[lonerider43]

i uniform the primer pocket and chamfer it
then champhur the flash hole in there
and debur and chamfer the flash hole exit.

[Rich4]

I’m currently trying to prove to myself that it doesn’t help, in 308 it’s looking good so far

[ben_g]

I use the KM pocket uniformer, and every firing I use it as it cleans out the pockets very quickly.

The only other thing I do is debur the inside of the flash hole with the KM tool

Does it help?? No idea but it makes me feel warm and fuzzy

[UL1700]

i uniform the primer pocket and chamfer it
then champhur the flash hole in there
and debur and chamfer the flash hole exit.

Do you have a measurable improvement with these modifications? Getting everything uniform makes sense to me in terms of reducing ES/SD but when it comes to actually changing the profile of the flash hole are you adding anything

I use the KM pocket uniformer, and every firing I use it as it cleans out the pockets very quickly.

The only other thing I do is debur the inside of the flash hole with the KM tool

Does it help?? No idea but it makes me feel warm and fuzzy

Do you worry about over-sizing with repeated use? With ultrasonic cleaning I find that the pockets come up nearly spotless anyway.

Has anyone tried the 21st Century bushed flash hole reamers?

Warm an fuzzy is the real name of the game

[Trevor Rhodes]

When your pocket uniformer is set it will not go any deeper just cleans any carbon out the pocket.

[lonerider43]

i uniform the primer pocket and chamfer it
then champhur the flash hole in there
and debur and chamfer the flash hole exit.

Do you have a measurable improvement with these modifications? Getting everything uniform makes sense to me in terms of reducing ES/SD but when it comes to actually changing the profile of the flash hole are you adding anything

I use the KM pocket uniformer, and every firing I use it as it cleans out the pockets very quickly.

The only other thing I do is debur the inside of the flash hole with the KM tool

Does it help?? No idea but it makes me feel warm and fuzzy

Do you worry about over-sizing with repeated use? With ultrasonic cleaning I find that the pockets come up nearly spotless anyway.

Has anyone tried the 21st Century bushed flash hole reamers?

Warm an fuzzy is the real name of the game

i cant be sure if it helps anything at all,the aim was to get better cleaner burn and to seat the primers to the correct depth.
wini cases are not very uniform in the pockets.

[ben_g]

i uniform the primer pocket and chamfer it
then champhur the flash hole in there
and debur and chamfer the flash hole exit.

Do you have a measurable improvement with these modifications? Getting everything uniform makes sense to me in terms of reducing ES/SD but when it comes to actually changing the profile of the flash hole are you adding anything

I use the KM pocket uniformer, and every firing I use it as it cleans out the pockets very quickly.

The only other thing I do is debur the inside of the flash hole with the KM tool

Does it help?? No idea but it makes me feel warm and fuzzy

Do you worry about over-sizing with repeated use? With ultrasonic cleaning I find that the pockets come up nearly spotless anyway.

Has anyone tried the 21st Century bushed flash hole reamers?

Warm an fuzzy is the real name of the game

Like I said warm and fuzzy. I’ve been doing it for so long I haven’t got non prepped brass to test as a baseline.
The primer pocket uniformer simple cleans the pockets after each firing without taking any more brass out as it can’t go any deeper.

Not sure deburring achieves much in Lapua brass. But like a lot of things in this sport it’s confidence in your equipment that leads you to competing well. I’m happy that my equipment doesn’t usually let me down at prize meetings. My grey matter on the other hand does let me down more regularly than I would like!!

[willow]

I used to deburr and chamfer my primer pockets, stopped doing that when I upgraded my ultrasonic cleaner, seems to clean them out quite well.