Flash hole deburring and primer pockets

I don't do anything to the flash holes but it would not hurt to uniform and chamfer them .

Primers I seat until they bottom out in the primer pocket..... if you don't you can get a misfire , the energy from the first strike full seats the primer but doesn't ignite it....
If the second strike fires it then you know it wasn't fully seated in the pocket.
Gary
 
I have deburred flash holes for some of my brass, but never really tested the theory.
I say whatever steps makes you that much more confident then by all means get after it.
On a different subject I too have noticed the accuracy difference in new brass vs. 1 fired brass....my Creedmoor doesn't take new brass as well as once fired through it....
 
sundog
Great Read , Thank You for sharing . I love benchrest shooting , Im not shooting many rounds per range trip . Three 10 shot groups , I'm prepping 30 rounds so I go overboard making all as exact as possible , I even polish the inside of the necks with 0000 steel wool wrapped around a smaller caliber nylon cleaning brush chucked in my drill press , makes seating very smooth .

Would love to shoot in that wearhouse but would remove my favorite excuse . Shooting is a never ending sport , from reloading , cleaning and shooting , always something new to try . Again , thank you for sharing that article . Be Well

Chris
 
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In reloading a lot of .40 S&W pistol rounds, I have found that occasional WIN and RP cases have a significant burr in them at the primer hole. In prepping them before I got my Lyman deburring tool, I noticed the cases with burrs had substantially more residue at the base of the case than those cases with no burrs. To me this was evidence of incomplete powder burn - i.e. the burr seemed to deflect some of the primer blast and the powder behind the burr likely did not cleanly ignite. Next piece of this is that, before I got my deburring tool and started using stainless steel media in a wet tumbler, it was hard to get into the bottom of those cases with cornflake or walnut media in a vibrating tumbler to clean burr residue out to my satisfaction. I demand an entirely clean case so that I can fully inspect it inside & out for cracks or defects.

And so I deburr my pistol cases as needed during cleaning inspection to ensure my best chance of having a fully clean case which, when fired, has the best chance of all of the powder igniting evenly and cleanly upon firing. An even clean ignition will give me the best result and will give me the least amount of smoke & residue meaning I am less of a smoking visible target and have less GSR buildup in my weapon to clean out later.

Do you need to? - No - ya don't unless the burr is massive enough to produce a full on miss-fire.

I do as a point to ensure I'm making the best most reliable ammunition I possibly can. Pride in craft.
 
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