Primer questions

[Thomasss]

1) I am going to load some Longshot powder in .357 Mag. 158 Rem HP at 7.5 grains. Hodgden recommends mag. SPP. I have none. I have Federal SPP, Federal Match SPP and (1980) Winchester SPP. Which is best to use?
2) There are mag pistol and rifle primers... why are there no manufactured mag primers for shotguns when using slow burning powders?

 

[reddog81]

Whichever is on top of the pile or otherwise easier to grab. You'll never be able to distinguish between the 3 you mentioned.

 

[Bfh_auto]

1) I am going to load some Longshot powder in .357 Mag. 158 Rem HP at 7.5 grains. Hodgden recommends mag. SPP. I have none. I have Federal SPP, Federal Match SPP and (1980) Winchester SPP. Which is best to use?
2) There are mag pistol and rifle primers... why are there no manufactured mag primers for shotguns when using slow burning powders?

There are Magnum shotgun primers as well. I run them in my muzzleloader.
Try one type of primer it it works. Use it.

 

[N555]

Federal magnum shotgun primers are insane.

 

[Riomouse911]

I think Winchester pistol primers may say for standard or magnum loads, I would try those. (I am out of Winchester primers or I would go check to be sure.)

Good luck, let us know how your loads shoot for you when you get a chance.

Stay safe.

 

[Thomasss]

Federal "Magnum" muzzle loader 209 primers
are just for muzzle loaders and not for loading shot shells.

 

[N555]

I haven't tried it but loading shotgun shells with BP209 primers might squib.
BP209 primers have a lot less bang than standard shotgun 209 primers.

 

[AK Hunter]

The reason they suggest that you use mag primers is that the primer cup is thicker & can handle the magnum pressures. If you load a ladder to develop your load (like you should be doing) you need to check to see if you are getting any primers blown out or burned through when using the normal SPP or SRP. If there is not any problems with using the lower pressure primers then just use the normal primers.

 

[Jim Watson]

I would use Winchester SPP for heavy loads, the Federals are famously "soft." I once scared myself with a below handbook maximum load in 9mm with cratered Federal primers. Back to CCI or WW, all was normal.

 

[Bfh_auto]

Federal "Magnum" muzzle loader 209 primers
are just for muzzle loaders and not for loading shot shells.

Mine are CCI Magnum. They don't say muzzleloader on them. I bought them because I was trying to run bh209 with terrible luck.

 

[Swampman]

Federal 209A primers seem hotter to me than the CCI 209M magnums.

If it helps, I've loaded Longshot in .357 SIG 147 grain and used regular Winchester SPP.

 

[tightgroup tiger]

I loaded Long Shot in my .357 magnums with normal SPP and never had any problems.
My load was 7.3 gr of Longshot with a 158gr Xtreme plated SWC crimped to the canular. Just a normal roll crimp, nothing heavy. My cases were trimmed so all roll crimps were consistent.
I wouldn't worry about it much, if you have magnum primers use them, if you don't, use what you have. Mine all worked and seemed to be accurate.
I do have a note on my spread sheet that the load was to hot for standard plated bullets, and a velocity of 1275fps. That was back in 2014.

Federal small pistol primers burned the hottest in a test Walkalong did years ago on the effects of changing to a different primer, in a load where all else stayed the same. He was Chrony-ing the loaded round to determine which primer gave the most velocity. IIRC Federal was the highest vel.

Edit to add:
Hodgdon data.
Hodgdon Longshot 0.357" 1.580" Min 7.3gr@ 1,258 fps, 31,700 CUP Max 8.4gr 1,394fps 43,200 CUP
It has good velocity.