.45ACP with Large Pistol Magnum Primers

Personally, I think magnum primers raise pressures in handgun cartridges similar to a .1 or .2 grain of powder increase. If you have a load worked up that isn't maxed out and shoots well, I would lower my load just a bit and work back up. Any port in a storm.

strange duplicate post. sorry...

Doesn't WLP say it's for magnum loads as well as standard? I've wondered why CCI makes both regular and magnum while Winchester just makes the one.

FWIW, I usually load with WLP and just recently picked up some CCI300 because the place I was buying from was out of WLP.

a Mag primer is supposed to burn at a hotter temp and for a longer duration, IIRC...

Now whether the Winchesters burn hotter for the same duration, or longer at the same flame temp, my no know.

Now that being said, Winchester primers is all I use, and all my loads are worked up with them...

When using magnum primers in non magnum rounds, back off 10% of whatever load you want and your max load should only be 90% of what is listed. Its equivalent to adding 10% more powder in other words.

That 9.7 grain load should be backed off nearly 1.0 full grain to equal the load data for the same round with a standard primer.

That 9.7 grain load should be backed off nearly 1.0 full grain to equal the load data for the same round with a standard primer.

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Do you have pressure tested data or other source for this?

My Loadbook shows a start charge using a 230gr LRN with Accurate #7 at 9.9 grains with an 11gr max load. Same for FMJ.

Based on that I'd say the OP's 9.7 gr load should be 'safe' even using the wrong primer? Though I always follow the "When in doubt? Don't." philosophy of life. I would just wait to get the proper components.

Some folks would just shoot them, and some would pull them. They obviously are not going to blow the gun up, but are probably tough on the gun.

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Truth.

OP, I have shot these with up tp 7 grains of unique, and 6.5 grains of w231 without a problem- for what its worth.

Steve, I purchased quite a lot of magnum primers recently on clearance for $18 per thousand. I currently do not have a magnum gun but could not pass them up. O spent a many hours researching their use in non magnum loads. I found this information from several reputable sources, although I can't remember where. Im sure a few people here can confirm what I've said if they read this. I've loaded quite a bit of 9mm and. 40 with them and they should great. Im not using max loads. I know this is internet heresy at this point but im not spending the time right now to trackl down the sources I used. But the my word is true for what that's worth.

I bought a chronograph that is on back order. When it makes it in I will start a thread on this comparing them against each other unless some one else does it first.

They'll be fine as long as you don't run very, very top ends loads (KB risk) or very weak one (gas cutting from primer leakage risk). I've used magnum primers interchangeably many times and changed nothing. They can make more of a light show, but otherwise nada as long as you the right load.

be careful w/any flake powder. pressure spike easily. ball or spheroid not near as bad.