Deburring the flash hole is a one-time job... as is "uniforming" the primer pockets. However, for me, that's changed lately.
Checking and trimming the case for proper length and doing the inside and outside deburring of the mouth of the case is an "on-going" job. The necessity to trim the cases depends on caliber and how "hot" you load your cartridges.
In most cases, if you use mild loads... you'll rarely have to trim and deburr the cases. However, if you use "hot" loads, you will probably find you need to trim the cases and deburr the case mouths, inside & out, fairly often... or in some cases, after EVERY firing of the cartridge.
Even if you shoot only mild loads, you'll rarely, if ever, have to trim your cartridge cases for length. However, you'll probably find that while the case may not stretch far enough to be too long, it may stretch "unevenly" with one side of the case mouth longer than the opposite side. In this case, you DEFINITELY need to trim the mouth of the case until both sides of the mouth are uniform... I.E., the same height which "holds" the bullet equally. If one side is longer, it may "tip' the bullet slightly as it leaves the case's mouth thus causing it to enter the forcing cone and lans & grooves slightly tilted... NOT condusive to fine accuracy.
I use to "uniform" the primer pocket only once, but lately, I've begun to use the "uniforming" tool "chucked up" in an electric screw-driver sitting on top of a neat little adjustable (for height) "holder/platform" that I found in a reloading tools catalog. It turns many of your reloading handtools into a tiny lathe-like tool when used in conjunction with a regular electric screw-driver. It is very useful for turning cases for uniform neck thickness, "uniforming primer pockets and for trimming cartridge case length & deburring case mouths.
It is very easy to clean out the primer pockets after each firing of the cartridge now and the "uniforming tool" does a better, fast job of cleaning out the primer pockets than the tool that is designed to clean the primer pockets.
Naturally, I'm careful to insert the primer pocket "uniforming tool" into the primer pockets carefully so as to NOT "nip away" any part of the primer pocket that SHOULD BE THERE!
But one fast "press" of the "go-button" on the electric screw-driver... and the primer pocket is CLEAN and "uniformed" again.
I do these "accuracy tricks" to all my rifle cartridge cases, from .222 Remington (heavy-barreled Sako) to .300 Savage (Model 99) to .338 Winchester magnum (pre-64 Alaskan Model 70 Winchester w/ 26 barrel) to the .44 Remington magnums I shoot out of my old/style Ruger semi-automatic carbine because I desire and expect the utmost accuracy from all of my rifles.
If I "miss"... I want the "miss" to be be MY fault, not because I never had a chance of "hitting" my aiming point because my rifle(s) were not giving me the upmost accuracy they're capable of giving.
Good Shooting!!!
Ron T.
