Question on pulled brass

I'd think they would of put the right primers in.
I wouldn't tumble any primed brass wet or dry.
If I wanted to tumble the brass I'd knock the pprimers out and reincert them.

Use what you load recipe calls for. Sucks finding I good load then you don't have the same primers next load. Deprime them. I'm cheap so I'll save them for other loads.

If you need to clean the cases, carefully with steady pressure remove the primers and save them. Hard to know what they actually are but I would figure on them being some sort of magnum primer though. I would remove the primer pin or the whole punch assembly if the pin does not come out, resize to restore neck tension without removing the primer and load as normal as long as the bullet will go in. I would not use the primers for SD/hunting loads if they were removed but good for plinking ammo still.

Magnum cartridge does not automatically mean magnum primers....for most stick powders magnum primers would not be necessary or even called for in 7mm Rem Mag. That said, I would probably deprime them and start with a primer I know I'll be using going forward. Doing a careful workup with a potentially unknown primer adds a variable I don't want, and may require a new workup once those 100 primed cases are all fired.

Large Mag Rifle primers are longer than the std rifle primers. So if std primers are used they will be setting low in the pocket.

Blue68f100 said:

Large Mag Rifle primers are longer than the std rifle primers. So if std primers are used they will be setting low in the pocket.

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Blue... I don't believe that is correct. A large rifle primer is a large rifle primer... magnum or standard. There are variations between manufacturers, but they are all supposed to be within the SAMMI tolerances.

Ifishsum said:

Magnum cartridge does not automatically mean magnum primers....

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Consult your load manual and use the primers called for in the load data.

Charlie98 said:

Blue... I don't believe that is correct. A large rifle primer is a large rifle primer... magnum or standard. There are variations between manufacturers, but they are all supposed to be within the SAMMI tolerances.

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Your right, it large pistol vs large rifle primers that have a different depth.

Ifishsum said:

Magnum cartridge does not automatically mean magnum primers....

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This is one of those things I just wish they would have thought about a bit more before they went and named them 'Magnum.' Super, More Better, Extra, Plus... something, anything would have been better than calling them 'Magnum' primers...

Charlie98 said:

Blue... I don't believe that is correct. A large rifle primer is a large rifle primer... magnum or standard. There are variations between manufacturers, but they are all supposed to be within the SAMMI tolerances.

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Yep, the difference is between large pistol primers and large rifle primers. Large rifle primers being about .008" taller...

a sleeve of primers is about four bucks. toss em if you don't mind the expense.

murf

Based on what I've read, never loaded a large cartridge like 7mm, I would work up a test/plinking load with the existing primers. Think of it as forming the brass to your chamber. Then neck size and shoulder bump from then on and work up your final load for accuracy.

It depends if I'm doing load development. I would dump them.
If I'm shooting a load that is solidly in an accuracy node, I'd try 5 and go from there. I've done this with loads that aren't maxed out.
However, primers are cheap and there is no way I would deprime and reuse primers or tumble primed brass.

If you haven't shot this brass out of your gun I would knock the primers out, do a full length resize. Use the knocked out primers with some cheap projectiles with the smallest safe charge of some cheap powder and shoot them so they fit your chamber then neck size them and then work up your ladder loads and see what the gun likes.

What is the purose of your loads?

Why not just full size a few without deprime, then load say 10 (at a start load)and see what happens. How bad could it be??

As far as the primers... I'd knock them out and junk them. I don't deal in Mystery Meat components with my reloads, nor would I waste 20 minutes of my time trying to salvage $3 in primers.

murf said:

a sleeve of primers is about four bucks. toss em if you don't mind the expense.

murf

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I agree 100%. Then you will know exactly what primer your reloads are using.