45acp Primer Pocket Reaming & Uniforming

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Show Me said:
I have read most every comment. Did you get your answer. What did you learn
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I read most of them too.

I was looking for suggestions on what to buy and bought a replacement for what I already had. Got it yesterday. (Optical illusion—despite looking larger, new reamer is slightly smaller than old one.)

IMG_4402.jpeg

Learned many things not actually in answer to my query:) but valuable anyway—this group comprises all kinds of different folks with all kinds of different ideas.
 
CQB45ACP said:
Thanks for the responses. Even the reflexively negative ones:)

Since as I’ve said, all I’m after is a reamer the size of the primer pocket gauge, I couldn’t possibly be proposing to enlarge the pocket to the point of looseness. We must all agree on that point, right? (Trick question—I’ve done it and it doesn’t.)

Now if folks are saying it will hasten the eventual looseness—maybe yes, maybe no. Anyone ever tested it? Does it happen before or after the primer pocket gets too shallow to load safely as mentioned in the 45acp case longevity article? I have had loose primer pockets and that’s why I bought gauge in first place.

As some suggested, I could use a countersink (have at least a dozen) but I’m not seeking only a chamfer per se and if not careful could go way to far. But still same theory.

So I’m back to my original point and will have to figure out which brand reamer to buy and at what cost. Until then I’ll use Papa’s old reamer.
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I'm not going to question why you are doing this since it's already a 5 page thread and i'm less than 1/2 way through it.
My only question is have you measured the gauge to ensure that it is within specification?
 
Because the difference between good and too big (ID) is so tiny, and they don’t need reaming to begin with.
 
CQB45ACP said:
Okay. I’ll pass it on to all the gauge makers:)

The narrow end of the reamer is .2071” BTW hard to take too much when the gauge and SAAMI are .2085.
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By my calculations if the reamer is resting on the primer pocket floor when reaming it should be cutting at a .2092 diameter. That’s if the reamer is at nominal dimensions.
Let us know how it works out for you.
 
JHTexas said:
By my calculations if the reamer is resting on the primer pocket floor when reaming it should be cutting at a .2092 diameter. That’s if the reamer is at nominal dimensions.
Let us know how it works out for you.
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Why do you say that?

It’s not even close to .2092” which is noticeably larger than the gauge which is around the .2085” spec.

Edit: and the gauge still fits very tightly
 
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CQB45ACP said:
Me too

Or reloading at all when a quick trip to Walmart or elsewhere would get you what you need.
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Walmart??? LOL!!!
😂
Sometimes you just need to follow your own path. That’s a wonderful thing. When that path leads to a cliff you want someone to let you know, not just watch you fall.
I guess that’s my way of saying, Have a nice trip. 😁
 
GeoDudeFlorida said:
Walmart??? LOL!!!
😂
Sometimes you just need to follow your own path. That’s a wonderful thing. When that path leads to a cliff you want someone to let you know, not just watch you fall.
I guess that’s my way of saying, Have a nice trip. 😁
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Fortunately no safety issues here at all so the cliff is mirage.
 
The " ONLY ISSUE " I've personally ever had with primer pockets ,were crimped aka Military cases .

MY go too solution has altered over the decades ,as I settled on chamfering or beveling the pocket slightly in late 80's . Ever so slightly ,doesn't take much .
Used to de-swage with an original Dillon . I've since modified it by polishing down the pocket pins , in other words resizing or under sizing ?.
Reason being I was losing far too many cases do too primer pocket losing ,far sooner than normal life expectancy . Fyi , this no longer occurs ,so YES it did work in MY cases .

Now the ONLY time I use the Swage machine is for Known cases fired out of Automatics . High Cyclic rates are hard on cases to begin with .

I've yet to see a high primer or lose one from factory ammo ,so I'm gonna have to assume the manufacturers KNOW what their doing from the get go .:)
 
BushMaster-15 said:
The " ONLY ISSUE " I've personally ever had with primer pockets ,were crimped aka Military cases .

MY go too solution has altered over the decades ,as I settled on chamfering or beveling the pocket slightly in late 80's . Ever so slightly ,doesn't take much .
Used to de-swage with an original Dillon . I've since modified it by polishing down the pocket pins , in other words resizing or under sizing ?.
Reason being I was losing far too many cases do too primer pocket losing ,far sooner than normal life expectancy . Fyi , this no longer occurs ,so YES it did work in MY cases .

Now the ONLY time I use the Swage machine is for Known cases fired out of Automatics . High Cyclic rates are hard on cases to begin with .

I've yet to see a high primer or lose one from factory ammo ,so I'm gonna have to assume the manufacturers KNOW what their doing from the get go .:)
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I have had to wrestle to get a few primers to seat like most everyone else, have encountered crimps but not in 45acp, have had a few loose pockets (which is why I first bought the gauge), but it’s the wrestling I don’t like and at least want to minimize.

Thus for some time I’ve been gauging & using as needed an old beat up reamer. I’ve now replaced it. Why it’s such a burr in others’ saddles I’ll never know:)
 
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CQB45ACP said:
I have had to wrestle to get a few primers to seat like most everyone else, have encountered crimps but not in 45acp, have had a few loose pockets (which is why I first bought the gauge), but it’s the wrestling I don’t like and at least want to minimize.

Thus for some time I’ve been gauging & using as needed and old beat up reamer. I’ve now replaced it. Why it’s such a burr in others’ saddles I’ll never know:)
Click to expand...

Reaming conjures visions of metal flying off the work piece ,as the reamer spins around inside the pocket .

Micro beveling ensures SMOOTH 100% full proof primer pocket seating . Provided pockets are CLEAN to begin with . DOESN'T contribute to losing in any way shape or form . It's the Primers funnel pathway ,so to speak :)
 
BushMaster-15 said:
Reaming conjures visions of metal flying off the work piece ,as the reamer spins around inside the pocket .

Micro beveling ensures SMOOTH 100% full proof primer pocket seating . Provided pockets are CLEAN to begin with . DOESN'T contribute to losing in any way shape or form . It's the Primers funnel pathway ,so to speak :)
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Okay let me restate—using a hand tapered reamer, I slowly and carefully relieve a little bit of brass from the top of the primer pocket much as one would do carefully to create a mild chamfer. Did I say carefully? Slowly? Chamfer like?

Wait till I reveal I also polish the pocket with a jewelers cloth.
 
CQB45ACP said:
Why do you say that?
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Here is a case with a large primer pocket, the green lines show the #4 Pin reamer intersecting with the case.
It has clearance at the bottom(no cutting) and then cuts a .6 degree taper per side and at the maximum could produce a .2096 diameter at the case head.
 

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JHTexas said:
Here is a case with a large primer pocket, the green lines show the #4 Pin reamer intersecting with the case.
It has clearance at the bottom(no cutting) and then cuts a .6 degree taper per side and at the maximum could produce a .2096 diameter at the case head.
Click to expand...
I get the point but doesn’t apply in the real world—neither my old reamer nor the new one have any resistance whatever at any point in typical cases. If the gauge drops in so does the reamer.
 
CQB45ACP said:
Okay let me restate—using a hand tapered reamer, I slowly and carefully relieve a little bit of brass from the top of the primer pocket much as one would do carefully to create a mild chamfer. Did I say carefully? Slowly? Chamfer like?
Click to expand...
Well that's totally different than reaming the entire pocket larger.
 
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