LP Magnum Primers

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Edster12

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LGS has new old stock CCI Large Pistol primers--magnums. I can grab them for half the current price of new stock. Roughly $20.00/1000.

My question is can I use these in 45 Colt loads. Currently have 2 different loads for the 45 Colt. 250gr.LRNFP over 8.5gr of Unique, and 250gr/LRNFP over 5.4gr of Trail Boss. If these could be loaded with the magnum primers by how much do you think I should decrease the powder by??
 
If it were me, I'd buy as many as I could afford. Then I would reduce my powder charge by 10% to accommodate for magnum primer.
 
I wouldn't hesitate to buy new old stock primers.

Some time ago, I tried large rifle magnum primers in H110/Win. 296 44 Remington Magnum loads. I had to reduce the load by 1 or 2 grains. With large pistol magnum primers, I doubt you'd have to reduce the load much if at all but it would be prudent to lower the load a bit and work up.

Keep in mind, that at the pressure 45 Colt loads operate, you won't see the usual primer signs of excess pressure and sticky ejection/extraction means you're way over accepted pressure.
 
It shouldn't be necessary to start below the published start charge, just don't use them with an already established/worked up charge, in which you used standard primers to develop.

I have substituted with magnum primers for many different cartridges with no problems. The only thing I've ever experienced was a change in accuracy.

I wouldn't recommend substituting standard for magnum for powders/loads that are published using magnum primers.

GS
 
Both the OP's loads are below Max loads, and there is no reason to reduce 10%.
Except that is just recommended reloading 101 anytime you change components.

And especially no reason to EVER reduce below a starting load.
EVER!

That's what starting loads are for.

Were I the OP, I would reduce the Unique load about 0.1 grain.
I would not reduce the Trail Boss load at all.

Mag primers are not made of C4 explosive.
And will not increase pressure dangerously, unless you were already dangerously too hot to start with.

rc
 
If you're using Winchester LPP you are already using a magnum class primer. From everything I've seen during reloading at the most you might have to lower the charge by .1gr or the most .2gr to achieve the same velocity but only if you're using a standard primer and not win primers.

At that price I would buy as many as I can afford!
 
Ok so I took a ride after work. $20/1000 or $95/5000. There were six boxes of 1000 left. Grabbed them all. As the guy was ringing me up I noticed that one of the boxes was open but looked full. I told the guy that one was open he said he knew about it, and told me that he ws throwing that one if for free!! Well it wasn't a full box it only had 900 in it. Oh by the way this is CCI/APS primers, but that don't bother me they run perfectly in my press which happens to be an RBCS Pro 2000 with the APS primer system.

I'm just a little upset that they didn't have anymore new/old stock they wanted out of the store!!


WOW!!! Just did the numbers and with the cost savings on the primers it drops my 45Colt cost down to $0.14/round--$7.02/50. Again WOW
 
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The only concern here would be in a semi auto handgun the harder primers MIGHT not fire reliably due to the harder primer cups. With a revolver I would not even think of this as a problem. RC has stated what I would give for an answer already.
 
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