SPP vs SRP ?

[Buckshot Bear]

Is there any more explosive compound in SRP over SPP?

 

Loading .38spl 125gr pills for SASS and someone has offered me 5000 Federal SRP for less than half retail price. 

[Widder, SASS #59054]

My first response is to consult your reloading manuals for this info.

 

My lunch table type comment would be:

I can't answer your question based on any factual engineering or scientific info that I have.

 

But, I would suggest you check out SAAMI specs for primer power rates, etc..... should there be such

a list.

 

Also, even if a list exist with such info, different manufacturers might supply different and various

power levels, cup hardness, etc.........

 

And it ain't always the power of the primer that is important but also your primer flash hole

size (diameter) and inside the case mouth chamfer burrs or lack thereof.

These variable are so minut that they actually make no discernible difference in

the performance of SASS/Cowboy type ammo.

 

Buy those darn things and enjoy em.  You're in no danger of any 'explosions' assuming you stay

within the POWDER recommendations from reliable reloading manuals.

 

..........Widder

 

[Goody, SASS #26190]

Harder strike is needed on the SRP.

[Rip Snorter]

Some folks would use SRP when trying to make Major with 38 Super in old IPSC days.   Seemed to work and I never saw a disaster.  I doubt you will find info in a manual.

[Major Crimes]

I have had to buy some SRP as well BB. 

Of all the writings I could find the majority said its OK but they are harder than SPP. Probably no issue unless you have weakened any springs.

I have a few SPP to go before I resort the the SRP so would be interested in your experience.

[Sedalia Dave]

 

 

 

[Sedalia Dave]

I watched the above video, and if it were me, using a load that is currently near max with SPP I would back it off a little and work back up just to verify there are no issues. 

 

For light to mid range cowboy loads I would consider them interchangeable as long as the springs in your gun will set them off.

[Widder, SASS #59054]

SD,

that's a remarkable video....... THANKS!

 

I believe its what most of us have discovered and/or witnessed over the years in our own

reloading and shooting experience.

 

And although the test for those 'Primer pressures' were barely different, I think some of the

higher velocities of the actual ammo is due to the info I was told years back in that SPM

and SR primers have LONGER burn, which will give better powder burn and therefore, help

reach higher velocities from the more complete burning of the powder.

 

Great video.

 

..........Widder

 

[The Original Lumpy Gritz]

10 hours ago, Buckshot Bear said:

Is there any more explosive compound in SRP over SPP?

 

Loading .38spl 125gr pills for SASS and someone has offered me 5000 Federal SRP for less than half retail price. 

Buy'em 

Sp mag are the same as srp.

[Gateway Kid SASS# 70038 Life]

15 hours ago, Buckshot Bear said:

Is there any more explosive compound in SRP over SPP?

 

Loading .38spl 125gr pills for SASS and someone has offered me 5000 Federal SRP for less than half retail price. 

Thinking that the primer compound is about the same. At our light load levels no perceptible difference for me. 
I came into a similar situation with  a boatload of Winchester SRP during the pandemic. Sold quite a few to keep others in primers (never heard of any problems) and tried about 500 in my rifle and pistol loads. Worked just fine in the pistols but about 1 in 30 or so required a second strike in the rifle. (1 or 2 in a match) Probably could adjust hammer strength to use them but still have plenty of federal SPM. Currently use the Winchester in my mostly stock 9 mm and they work just fine. 
If I came across more would have no qualms about using them. 
Regards

    

Gateway Kid