How much difference is there in a magnum primer vs standard primer?

I just loaded up 100rds of 9mm with the Lyman 356242 121gr boolit.

3.3grs of titegroup and 3.5grs of titegroup(different loads to play with)

I did not realize that I had put in CCI 550 small pistol magnum primers in the cases until just a minute ago.

Max load is listed at 3.8grs of titegroup in Lyman 49th. Then on Hodgdon's site, it lists 115gr boolit at 3.9-4.3grs of titegroup and 124gr LCN(?) at 3.6-4.0

Will they be safe to shoot, or do I need pull them down and start over?

I will fear no evil, for thou art with me.

My 9mm CCI magnum pistol primer tests with my cases, my boolits, my guns, my powder of choice and my charge weight of choice say it's not a big deal with low to mid range loads. No data on near max and I don't plan to have any, but I'd say your fine. Some magnum primers are indeed stronger, but they're not little nuclear bombs just waiting to be touched off.

If you search the web, you'll find hundreds (thousands?) of questions exactly like yours. Many people advocate caution and don't do it, but many offer their experiences and say it's no big deal. If it were me, I'd shoot 'em. But that's me.

https://www.google.com/search?q=magnum+primers+in+9mm&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:eek:fficial&client=firefox-a

"Give a man a fish and you feed him for a day. Teach a man to fish and you feed him for a lifetime.", old Chinese proverb.

Boolit Master Join DateJan 2010LocationTom, in Gloucester, VAPosts890

As I have been unable to find any standard primers for sale, but have had opportunities to buy magnum primers, I did. Yesterday I did a test comparing the two. Using Remington 2-1/2 standard large pistol primers, CCI 350 magnum large pistol primers, and two different military surplus powders, M9 and #105, I prepared four samples of test ammo. M9 and #105 powders were obtained from Jeff Bartlett at GIBrass.com. Burning rate appears to be similar to Unique. The two powders appear to be the same, but do not meter the same. M9 charges throw a little bit lighter than #105. The difference could easily be attributed to them being different lots of the same powder.

The test cartridge was the 41 Remington Magnum with 240 gr LBT WFN GC bullet. Moderate loads of each powder were assembled using standard primers, and loads using 1/2 grain less powder were assembled with magnum primers. Five shots of each combination were fired over the chronograph. Mean velocities of the four treatments were compared using ANOVA. There were no significant differences in average velocities, which were all very close to 1150 fps.

Magnum and standard primer velocities were pooled and variances were compared using the F test. There was no significant difference. However, it appeared to the Mk I eyeball that there may be a difference in variance, and a repeat test with a larger sample size might indicate a significant difference, with magnum primer loads being more variable. However, given that the difference is not significant at this level, even if found to be different with a larger sample size it probably is not important.

In conclusion, substituting magnum primers with an appropriate adjustment in charges and avoiding maximum loads can be a successful expedient during times of primer shortages.

I've switched on occasion and with low to mid-range loads,have noticed no difference with 9mm, 45acp, 44mag or 45lc. In a well functioning, well made firearm i'd shoot them up. I would stay away from max loads out of caution but thats me

"Ever since I arrived to a state of manhood, I have felt a sincere passion for liberty" Ethan Allen

Not much difference in SP primers, you are good to go.

I my 357 BH with a 125 grn lead tc bullet and 4.5 grn of unique I have found the CCI sp mag primers make the round more accurate. Although in my 2" S&W mod 10 I have been having some ignition problems. I believe it may be seating depth since the round will go off on the second strike.

My daughter also has problems with setting the CCI's off with her Ruger SR9. Even after returning it to Ruger.

As far as your load goes, I have never used Titegroup so I can't comment on that.

A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed.

It could be an issue if you shoot maximum or near max loads. I never go very close to max loads and have not had an issue.
Use tried and true load development techniques, or just back down a bit.

Shiloh

"A society of sheep must in time beget a government of wolves."
Bertrand de Jouvenel

?Any government that does not trust its citizens with firearms is either a tyranny, or planning to become one.? ? Joseph P. Martino

?If you put the federal government in charge of the Sahara Desert , in five years there would be a shortage of sand.? ? Milton Friedman

I've ended up with magnum pistol primers from trades , all pistol primers no rifle stuff as of yet . Since I rarely load pistols and revolvers to where such primers are really useful , I've used them in place of small rifle primers . Now I will quickly point out that I don't load the ammo anywhere near pressures that would be to much for a pistol primer . The loads were more a means of using up what I had not looking for the last bit of velocity .

I've used both CCI and Winchester small pistol magnum primers and got good loads from both . Now that those primers are gone I can try using small rifle primers for one of the loads . I am interested to see the difference in accuracy between the Winchester small pistol magnum and the Winchester small rifle primers . Just for what it's worth , all this has been with the .223 Remington case .

Jack

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Abbreviations used in Reloading
Pointed Soft Point "Core Lokt"

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