Primers ??

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Primers ??

Postby Guns-R-Us » Mon Aug 15, 2011 8:23 pm

Hi folks,

I've been reading up on the forum and haven't found anything on the type of primers being used. I bought an 300 OSSM upper from Oly and put together an lower from some parts I had in the safe. After a trip to the WAC show in Puyallup sunday I have some .243 WSSM brass I'm ready to neck up and some brass. What I don't have are the primers, as previously I've only loaded for handguns. Should I be using regular or magnum primers??? Any help or information would be appreciated.

Thanks,
Mike
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Re: Primers ??

Postby Globemaster » Mon Aug 15, 2011 8:36 pm

Guns-R-Us wrote: I've been reading up on the forum and haven't found anything on the type of primers being used.

I’m sure Hoot, Zooka, lilquiz, Tunnel Toad, and a few of the other 300-OSSM shooters will chime in later.

Guns-R-Us wrote: I bought a 300 OSSM upper from Oly and put together a lower from some parts I had in the safe.

the rifle looks great! ... Q: have you shot it yet?

Guns-R-Us wrote: After a trip to the WAC show in Puyallup Sunday I have some .243 WSSM brass I'm ready to neck up and some brass.

.243 to .300 is a mighty long way! are you going to anneal them? or?

Guns-R-Us wrote: What I don't have are the primers, as previously I've only loaded for handguns. Should I be using regular or magnum primers?

for my 25WSSM I’m using a Remington 9 ½ Large Rifle, and I’m sure the 300-OSSM could too!

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Re: Primers ??

Postby Guns-R-Us » Mon Aug 15, 2011 8:48 pm

.243 to .300 is a mighty long way! are you going to anneal them? or?


I bought a 100 cases total 50 new and 50 fired. My plan was to anneal the new ones then fire form them all with about 10 grains of something on the self, followed by a trip into the resizer die with a little extra lube in the neck. I'm praying that will work! From what I've been reading others have done similarly with good results. If you have any other suggestions I'm open to ideas....

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Re: Primers ??

Postby turkey » Mon Aug 15, 2011 11:47 pm

I tried the fire formed and annealed 243 WSSM cases, and it didn't work so well for me. Messy, time consuming, and fighting with a neck bulge problem. I have sense gone to 25 WSSM cases just necked up in the sizing die, no fuss, no muss no neck bulges. I'm on the 7th reloads with these cases with zero split necks. As far as primers go, I'm using Remington 9 1/2 large rifle primers. To date I've managed to get sub 1 inch groups with 150, 165 and 180 grain bullets. I'm using BL(C)-2, IMR 4064, and IMR 4320, I may not be getting the absolute top velocity possible, but I like the groups. IMHO, I don't think a deer is going to notice if he gets hit with 2400 ft/lbs or 2250 ft/lbs. of energy, for me it's all about putting the bullet where it needs to be.
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Re: Primers ??

Postby Hoot » Tue Aug 16, 2011 2:21 am

turkey wrote:I tried the fire formed and annealed 243 WSSM cases, and it didn't work so well for me. Messy, time consuming, and fighting with a neck bulge problem. I have sense gone to 25 WSSM cases just necked up in the sizing die, no fuss, no muss no neck bulges. I'm on the 7th reloads with these cases with zero split necks. As far as primers go, I'm using Remington 9 1/2 large rifle primers. To date I've managed to get sub 1 inch groups with 150, 165 and 180 grain bullets. I'm using BL(C)-2, IMR 4064, and IMR 4320, I may not be getting the absolute top velocity possible, but I like the groups. IMHO, I don't think a deer is going to notice if he gets hit with 2400 ft/lbs or 2250 ft/lbs. of energy, for me it's all about putting the bullet where it needs to be.


This past weekend, I annealed and fire formed a bag of WW25 WSSM. Yeah, it's messier, but after the 2nd or 3rd time it's not so bad. My first batch I just resized using a series of increasingly larger decappers, without annealing. That worked also, but left me with donuts where the neck meets the shoulder. You'd start a bullet easily and all of the sudden it ran into a constriction point that was narrower, requiring a lot more pressure. Those donuts did not iron out from shooting. I did experiment with reaming them out, but I'll go with the fire forming. I experimented with an old bottle of Unique I had laying around. For reliable expansion it took 13gr, topped off with grits and a styrofoam cup disk for reliable forming. Annealing takes a time or two to get right. Lesson learned: Don't use a swirl tip hot MAPP gas torch. You don't need that much heat. My old brass Bernz-O-Matic with it's tiny penumbra or whatever you call the smaller flame within the larger flame, heated them up slower and with greater ease of control, but I digress...

Remington 9 1/2, WLR or Fed 210M have worked equally well for me. CCI 200s were a little weak for harder to light powders. I use them only for fire forming as they are less expensive. I have never tried taking .243 up to .300, just .25 and even then, the necks don't like stretching that far, so I imagine the .243 necks would be even less thrilled over the stretch. After the first two bags being perfect, he last bag of Win 25 WSSM were horrendous with folds and kinks in 12 of the 50. I actually took them back to my reloading shop to their disdain and insisted on an exchange. The bag I got in its place still had 3 bad ones. Must have been a bad lot from Winchester. It's hard when they're the only game in town for 25 WSSM brass. It's like being mad at the local utility company. Where you going to take your business if you're not pleased with their service. :roll:

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Re: Primers ??

Postby Guns-R-Us » Wed Aug 17, 2011 5:21 pm

Hoot wrote:
Remington 9 1/2, WLR or Fed 210M have worked equally well for me. CCI 200s were a little weak for harder to light powders. I use them only for fire forming as they are less expensive.

Hoot


What about magnum primers?? This is magnum cartridge, so why are they not used? Does it cause to much of a spike in the case pressure?
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Re: Primers ??

Postby Hoot » Wed Aug 17, 2011 7:38 pm

Guns-R-Us wrote:
Hoot wrote:
Remington 9 1/2, WLR or Fed 210M have worked equally well for me. CCI 200s were a little weak for harder to light powders. I use them only for fire forming as they are less expensive.

Hoot


What about magnum primers?? This is magnum cartridge, so why are they not used? Does it cause to much of a spike in the case pressure?


You got me there. The Rem 9 1/2 is one powerful, hot primer. Considering the proximity of the powder column to the flash hole in these super short magnums, I never considered a magnum primer. I do use magnum primers in my .300 Win Mag, due to it's length and the fact that it runs on slower powders like H1000.

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