About 10 years ago my wife bought me this "Whelen" bench at Costco. It's solid as a rock and quite suited to the task. Look closely and you'll see I was cooking up some "Garand Food" last night!
How important is primer pocket/flash hole prep?
- Thread starter Calvin45
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beaueel
Well-Known Member
If you are cleaning your brass in a tumbler, be careful there is no granules stuck in the flash hole. I always clean mine.
If you weight sort your brass you will want to deburr the flash holes and cut the primer pockets to depth . I like to fire my brass 1 time size it cut it to length, cut the primer pockets to a standard depth, deburr the flash holes , then weight sort it . You can take some brass and weigh it right out of the box and sort it into groups load it , fire it then do the prep and reweigh it you will have more pieces of the same weight after doing it this way .
PNWdude67
Well-Known Member
Shhh... keep this real quiet. So far the chrono and targets have not noticed I never attend to the primer pockets! Seriously, with quality brass, it is a waste of time IMO as it makes no difference in the consistency of down range results. If you enjoy it carry on, it's not hurting anything.
I have done it since the 80s, and I like the "idea" of it. I went to quality brass and don't have to touch either, so now only on the cheaper/factory stuff. Of the two, the "only" one I worry about, is the flash hole, I have seen smaller groups from doing that, as much as a 1/2" too. Cleaning? I always scrape the carbon out, just so it can't possibly absorb moisture. It probably can't anyhow, because of the tight fit, but it makes me feel better. 
Canhunter35
Well-Known Member
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- Jun 13, 2017
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I've found uniforming primer pockets is just for fun and doesn't really do anything. If you're using different varieties of brass, uniforming the flash hole and deburring had a measurable gain in accuracy on the cheaper brass
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Ronald W Schaefer
Well-Known Member
I have seen an improvement in the bulk brass I used to use back in the day with a skinny wallet. Finally got to using Lapua and Norma brass and discovered through testing I didn't need it. So the question is, I think, "what's your time worth?". Do you need to use lower end brass to save $$$ or spend the $$$ and save the time? If so, I have seen about a 10% decrease in group size by using Sinclair flash hole deburr tool. I cant see any difference (and have tested it) with the higher end brass. Lazy now and out of that business!
!
misterc01
Well-Known Member
IMHO Consistency is the key to consistent accuracy. If what I reload is consistent, same process, then next issue is shooter consistency. So, I deburr and uniform primer pockets as part of my reloading process. if nothing else, it can't hurt!,
Completely agree, it takes a few minutes, so why not. Does it make any difference?I can't say but if it gives the shooter more confidence in the end product, do it. If not, don't. My personal experience is the greatest effect on the ammunition os the shooter. With all my efforts, occasionally I mess up a shot.
zb338
Well-Known Member
I like what L. Kilbourn the inventor of the K-hornet used to do with bench rest brass. He loaded it and
then shot it. Any brass that went out of the tight groups got separated and he used them for practice
or varmint hunting.
Zeke
then shot it. Any brass that went out of the tight groups got separated and he used them for practice
or varmint hunting.
Zeke
264MHC
Well-Known Member
I've never uniformed primer pockets but I do uniform and debur flash holes. I use the Lyman tool with the tapered bushing on new brass that has been trimmed to the same length. I take it off the handle and chuck it in my drill. Takes about 10 seconds a piece and only has to be done once so it's worth it to me. I've always done it and never had a problem achieving consistent accuracy and velocity so There's no reason to stop now.
That's a very nice bench
