Does anyone know what kind of velocity hit (fps) one would take by not using small pistol magnum primers and instead just using small pistol primers in 357 Magnum?
Small Pistol Primers vs Small Pistol Magnum Primers 357 Magnum?
- Thread starter ncav8tor
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Cant comment on the specific loss in velocity I did notice wildly changing velocities. I find magnum primers are more consistent and more stable.
OP
Thanks for that info.
148g wadcutter
3g of Bullseye in .357 brass
This is really a .38 load
Or
158g flat point berry's
5.5g N320
Feels like a spitball outta my revolvers
3g of Bullseye in .357 brass
This is really a .38 load
Or
158g flat point berry's
5.5g N320
Feels like a spitball outta my revolvers
OP
For sure, powders all burn at different rates and different temperatures. Local outside air temperature, elevation, etc also play into the mix. I asking in terms of generalities, if there is such a thing.
Primarily, I was wondering if the manufacturers had published any data or if anyone had done their own tests with different powders to make a somewhat definitive statement on the matter.
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Definitely powder dependent. 2400 doesn't require magnum primers & my .41 shot erratically with them. Switched to standard primers & it shot great. For the kinds of loads you'd use, say, Unique or 231 for, magnum primers are definitely not called for. All that changes with slow burning powders & max loads.
There's a ton of info on the 'net about this very subject, if you go lookin' for it. Just figure out what powder yer gonna use & go to the manufacturer's load data page on their website to see what they recommend.
There's a ton of info on the 'net about this very subject, if you go lookin' for it. Just figure out what powder yer gonna use & go to the manufacturer's load data page on their website to see what they recommend.
I don't give reloading advice or load formula's on this forum any longer. Too many idiots that will argue with a brick wall to waste time on. If you really want to know, give it a try and post results or consult a reputable manual...
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That jives with a report I read, where 2400 powder reached max pressure with a lower charge, and had a resulting lower velocity when using magnum primers. Max performance was with standard primers.
Performance differences between regular and magnum primers will be dependent on the powder used.
Slacker
Liquor and Whores...
Also case capacity. For example:
I've seen minimum charge weight 38spl loadings show erratic velocities with standard primers, but smooth out with magnums.
Basically, ya gotta try it and see.
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Ikarus1
Avtomat Krishna-kov
For Bullseye/TG and just about every other non-magnum (H110/W296) powder, I just use SPPs. It's usually for my cast plinker loads otherwise I'd be shooting full bore H110 powder firebreathing loads with a CCI magnum primer.
OP
I don’t know who the heck this is directed at but if it is me, I am pretty sure that I didn’t ask anyone for any reloading advice.
For the record, I’ve got a shelf full of reputable reloading manuals.
Edited for forum decorum.
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Anecdotally I can tell you:
1) magnum primers are generally match up with certain powders, not certain cartridges.
2) Using a standard primer when a magnum is called for can result in poor ignition, incomplete burn, erratic velocity
3) using a magnum primer when a standard is specified can have any result from no change to unexpected pressure spikes.
4) SRP is basically equivalent to SPM as long as your gun will set them off.
5) Whatever you're doing, start low and work up.
Sorry I can't be definitive but I don't think that's possible outside of a lab.
OP
OK, this question was a perplexing one and so I decided to test it out for myself to see what I came up with. I tried to be as exacting as I could be without completely going down a rabbit hole, i.e., I did not weigh and sort every projectile.
I started with:
My test pistol was a 4 inch Rossi 357 Revolver. My chronograph was a Competition Electronics ProChrono Digital Chronograph with Digital Link to upload the data to my cell phone in a PDF format.
DISCLAIMER: This is my load data utilizing my components, pistol, chronograph and reloading skills. These are my results and your results might vary. Do not use this loading data or the results as a definitive guide on what you should reload. You alone, are responsible for what YOU reload.
Here are the results and just for reference, the last chronograph results you will see is for factory Federal 357 158 Gr JSP ammunition.
Edited to show proper powder charge used in this post. Thanks Crazy Carl!
I started with:
- brand new virgin Starline 357 brass
- 14 grains of Alliant 2400 powder (each round individually weighed on a RCBS Chargemaster Combo)
- Because I wasn't using a maximum powder charge, I tested three different types of CCI Primers: CCI small pistol primers, CCI small magnum pistol primers and just for grins CCI small rifle primers.
My test pistol was a 4 inch Rossi 357 Revolver. My chronograph was a Competition Electronics ProChrono Digital Chronograph with Digital Link to upload the data to my cell phone in a PDF format.
DISCLAIMER: This is my load data utilizing my components, pistol, chronograph and reloading skills. These are my results and your results might vary. Do not use this loading data or the results as a definitive guide on what you should reload. You alone, are responsible for what YOU reload.
Here are the results and just for reference, the last chronograph results you will see is for factory Federal 357 158 Gr JSP ammunition.
Edited to show proper powder charge used in this post. Thanks Crazy Carl!
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24gr of 2400 in a .357?!?!? Will that even fit in the case? I don't even know of a .41 load that calls for that much 2400. Did you mean 14gr?
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Very cool. Thank you for this detailed share.
OP
Yeah, I fat fingered that post
! It has been corrected but the chronograph data shown in the photos and pdfs are correct. Thanks CC!
Y'know, if I'd paid more attention to your post, I'd have seen the data listed on yer load sheets & not even said anything. Lol!
crashclint
Well-Known Member
About 10 years ago I was given a couple hundred Magnum LPP so I used the primers with .45 200gr lswc. I was using Bullseye powder and if memory serves me which most time it doesn't I used 4.0 grains of powder which sent the round down range just as accurate as a LLP with more powder.
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