I am sure this has been asked a million times, but here goes again. I started gathering reloading component's and equipment this passed year. I scored some 240 grain xtp 44 mag 2400 powder and 1000 federal mag primers. Heres the question, all the load data I have in my books call for large pistol primers, not mag primers. As I am new to reloading I dont want to deviate from published data. Guy that sold me the primers told me they were correct for aplication and I trust him as he has been my go to gun shop for 30 years as well as the go to shop in my area for reloading supplies. I would hate to think I bought 1000 primers that has limited use. Where can I find load data using these components.

I think as long as you work up your loads carefully and keep an eye out for signs of excessive pressure, you should be fine with the magnum primers. Also, maybe keep your loads about a grain below the maximum listed for the standard primers.

That's why I like using Winchester primers. On the box, it states that they work for large AND magnum loads!

But now that you have magnum primers, it sounds like a really good excuse for a new gun!!

Due to the shortages I am using small rifle primers in my pistol cases. I have not witnessed any changes in the end result. I wouldn't substitute a magnum primer into a recipe that was developed with a standard primer, nor vice-versa. But if you start at the beginning and work your way up until you hit the geespot you will be fine.

I also prefer WLP's

Alliant, the manufacturer STATES " do NOT use magnum primers with 2400." This information isrecent within the last 3 or so years, that is why the manuals state std. primers.

Doc

Some powders ignite easier than others. H-110/296 are harder to light off. I know E Keith used 2400 and told Ross Seyfried he never used magnum primers, so perhaps it lights easier. The pressuer would probably be too high with 2400 and mag primers.

I don't have enough experience with 2400 to determine what the effects of a mag primer would be, however if you are going to go that route, start low and work up.
I doubt I would go up to the top end with a mag primer and 2400 but you certainly should be able to get a workable load.

Regarding rifle primers in pistol brass, be careful. The rifle primers are .01" taller than pistol primers thus will sit just a bit proud when seated in a pistol primer pocket. For a hard kicking load I would be concerned that one might touch off when slammed against the recoil shield when the pistol is fired. You could ream the pockets deeper which would probably be the safe thing to do.

Actually I find .0040 - .0045" difference with those that I am using. When seated you can't tell one from the other.

I have used both mag and std pistol primers with 2400. In my experience it really depends on the caliber and load. I would never use mag primers in my 38 SPL loads that I use 2400 on but on the other side if you don't use a mag primer on 20+ grains of 2400 in a 45 colt you will not get good ignition. The real iffy part comes in when you start trying to run borderline standard pressure loads. Mag primers can make a huge difference here. You should consider the volume of powder and the case size. I have used a ton of 2400 For the simple reason you can start low and move up without any major jumps in pressure 2400 is pretty predictable am not a 296 / 110 guy. Main reason I like 2400 is it shoots in almost every straight wall pistol caliber I have. One stop shop.

I agree with H2OBug I shoot and have shot a lot of 2400 in 41 mags, 44 mags, 454s etc. I have also used both standard & mag primers. While I do not load for MAX speed or pressure, I have had no issues using mag primers with both "old" Hercules 2400 and the Alliant 2400.

Man I love this stuff!! I wish I had all the time it required to study all these powder / primer combinations, and actually get hard evidence of what REALLY happens.

My 44 load has always been 21.0 gr of 2400 with a 240gr bullet. Used cci mag to start but went to fed mag primers. My powder is older than 3 yrs. first time i ever heard to not use mag primers with 2400. 😯 been wanting to try standard primers for funsies, just not enough time to do it all. 😬

+1 KYODE. excapt i never changed from cci mags. i have never found an issue going hot or moderate. now that i know the maker is telling us not to use mag primers i most likely wont. of course im out of primers now and need to get more. just me if i had mag primers id use em.

Thanks for the info. Was out and about and found winchester lp primers picked up a thouasand for $ 29 seemed a good deal. I also picked up a hornaday reloadin manual . While readin online I found alot of contradictions on mag vs standard. Interesting part is that there is alot said about mag primers used in colder shooting conditions such as hunting sub freezing. Freezing being 32 f isnt that cold for hunting in ny. Is aliant 2400 that touchy in general . Perhaps I should look for a different powder.One more thing is there was some reference to mag primers in general causing inconsistent pressures compromising accuracy. Now we all know theres alot of disinformation on the internet thats why I ask here.