[Trent]

I goofed when priming some brass (a couple YEARS ago).

When cleaning the gun room I found a box of 45 colt that was labeled "do not use, primed LR".

Now, I'd hate to waste a perfectly good primer (or 100 of them as it sits). :)

How much should I back my load off to use them? I understand LR is a bit hotter than LP, and the cup is harder so it might not seal up and could leak under high pressure.

They sit flush with the case, should all go BANG just fine. Just don't want them to go KABOOM.

Firearm is an old Armi Jager SAA clone, I use light loads in it.

[Walkalong]

Unlike small rifle and small pistols primers, which are the same height, large rifle primers are taller than large pistol primers. Flush is not OK in my book.

[rcmodel]

+1

Pull them & deprime them.

If even one of them gets cantankerous and slams against the recoil shield and goes off?

It will lead to a Series of Unfortunate Events.

rc

[Trent]

Hmm. OK I'll pull them!

[NeuseRvrRat]

if you're careful when depriming the live primers, there's no reason you can't use them in your rifle loads. shouldn't be any waste, except your time ;)

[Master Blaster]

My understanding is that rifle primers are thicker than pistol to better resist the strike of a free floating firing (no return spring) pin found in some semi auto rifles so you don't get a slam fire when the bolt closes and the firing pin kisses the primer. They also may be a bit hotter to set off that big case full of slow burning powder. Most-likely you would be ok using them but the firing pin in your revolver may not have enough oomph to set them off reliably. Now I seem to recall that the 460 VXR uses large rifle primers in some loadings, so I doubt contact with the recoil shield will set them off.

My rule is always used the recommended components or equivalent in hand loads, but you would most likely be Ok. JMHO YMMV

[rcmodel]

The .460 S&W case uses Lg Rifle primers in All loadings.

As such the primer pocket is deep enough to use them.

The .45 Colt the OP ask about uses Lg Pistol primers, and the primer pocket is not deep enough to use Lg Rifle primers in them.

rc

[BruceB]

Canadian Industries limited (CIL, later IVI) loaded the .44 Magnum for CARBINES....there was NO handgun hunting, NO defensive carry, and NO market for handgun hunting ammo. The Ruger .44 semi-auto carbine was the reason that CIL loaded this stuff. It was a 240-grain softpoint load, and pretty decent ammo.

Now get this: because it was intended for carbines, they used their # 8&1/2 primer... the SAME primer used in their .270, .30-06, .303 etc etc.

I fired a goodly bunch of this ammunition, but only in handguns. My Ruger Super Blackhawk AND my S&W 29 thrived on it, and even the S&W in double-action fired it consistently.

I would simply reduce your powder charge by one grain, and use the ammo for non-critical purposes. As long as the primers seat flush, you are good-to-go.

[Trent]

I think I'll just pop them out. I might experiment with reloading the popped out primers just to see how many duds I make. :)

[Walkalong]

Flush isn't good enough IMO. May never have a problem, but if you do.......not worth it.

I wonder if those folks those folks at CIL uniformed the primer pockets with a large rifle uniformer, making them deeper.

[FROGO207]

If they come apart with the anvil intact they will fire as intended with no duds.:) I have removed hundreds of them and reinstalled them in other brass with no FTF due to bad primers unless I put one back in without the anvil. Just use slow and steady pressure and they will not go off when you deprime them.

[Hondo 60]

I might experiment with reloading the popped out primers just to see how many duds I make.

You shouldn't make any duds.
Unfortunately for me, many moons ago, I messed up a whole box of 50 rounds.
I had to take the whole thing apart.
I then re-used all 50 primers with no issues.

[Walkalong]

Sam here, unless you physically dislodge the anvil somehow, it is going to go bang. Primers are actually tough little critters.

[Clark]

When I was testing 45 Colt brass with 454 Casull double loads, I used large Rifle primers.

That testing went on and on and one until the recoil blew the wrist out of the 410 Walnut stock.

[Trent]

Clark, sometimes you scare me.

[Master Blaster]

Personally, I would either load and shoot, or trash them, if you decide to decap them make sure you are wearing good eye protection, as they have more energy than you would think, and if one goes off, you will have some shrapnel flying around. You can aways buy more primers and cases, eyes are irreplaceable.