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All Brass Shotshell Question

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Pinback:
I'm trying to prime my 16 gauge Magtech brass shotshells. I ruined my vintage cast iron priming tool, snapped one of the handles off. The large pistol primers are too big to fit the primer pocket. I am asking for the best method of gently reaming out the primer pocket to accommodate the primer. I have a vintage Herter's 16 gauge shell holder but it's not the correct size to fit in my Rock Chucker press. I've had great success using my 12 gauge "Cowboy" Die Set, but unfortunately they don't make one in 16 gauge. Now I'll have to try and find another 16 gauge "capper" tool. Any help would be appreciated to make this loading process possible. Thank you

Cap'n Redneck:
Buffalo Arms Co. have CH4D 16ga. shellholders, albeit a bit pricey at $ 29.59 ea.

https://www.buffaloarms.com/ch4d-16-gauge-shell-holder-4d40816gsh.html

Have You tried beveling the edge of the primer pocket to see if that helps with primer entry?

If the whole primer pocket really is to tight I would consider grinding down a drill bit if one can't be bought in the correct dimension...

It's real easy to take too much metal out of the primer pockets....very hard to put some back in....

In such a case that the primer pockets have become somewhat "loose", I've had luck with using a suitable hex socket and extender.  Place the hex socket over the primer pocket in the inside of the case and gently tap the socket down with a hammer, thereby "swaging" the primer pocket down to size.  Rotate the socket a few degrees and repeat the process as required. 

LongWalker:
Just a thought.  Perhaps you could use a primer pocket reamer to enlarge the primer pocket (much as is done to remove the primer crimp when reloading military rifle cases).  A primer pocket uniformer could be used if needed to even out the depth of the pocket. 

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Abilene:
I once snapped the handle off of an antique 12ga priming tool after using it just a couple times.  I don't know if this will help any, but here's how I do my 12ga Rem-UMC shells.  I place the empty hull over the primer on a flat table top and push it down to get the primer just started, or "stuck" in the pocket.  Then I set it in my Lee LoadAll 2 to seat the primer.  But before I had the Lee, I would put a socket driver (5/16" I think? Large enough to fit down in the bottom without pushing on the primer pocket).  Then tapping the end of the driver handle with a hammer to push the hull down over the primer.  I recall someone once saying they had primers go off when trying that, but I did hundreds with no problem.  If the primer pocket in your shells is actually too small for the primer to even get started, then I guess that needs to be addressed first.  Good luck.

Sir Charles deMouton-Black:
The trick is gentle tapping. Just enough!  I have a wooden block with a gas fitting (Think of a thimble with a hole centered in the bottom. A medium sized nut works.) inset in one end; Use a Lee depriming punch to tap the fired primer into a drilled hole. The other end has a bit of mild steel plate screwed down; Place the new primer on the pad, set the case over and nudge the primer in to start. Then a hardwood dowel or deep hole socket inside the case and tap down GENTLY til seated.

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