Primers - Again

[Klaatu Barada Nikto]

Many have used SRP's for 357 Magnum (myself included), but has anyone used SPMP for SRP's?
Seems SPMP are plentiful right now.

 

[Sofie007]

In early nieve loading daze, did ladder using only SPMP, bc published data didn't specify! And cartridge is 'MAGNUM'!!!! IKR!!!! Was OK, but w/ H110 got some very high fps, but no high pressure signs. This was S&W mod 66 4" barrel. Used 2400, Unique, H110, & Titegroup; 158 gr GDHP. Hope this helps.

 

[jak67429]

be carful using pistol primers in an ar or any other semi auto rifle with a floating firing pin. the steel on the pistol primers are not as thick as rifle primers you may get slam fires.

 

[Klaatu Barada Nikto]

be carful using pistol primers in an ar or any other semi auto rifle with a floating firing pin. the steel on the pistol primers are not as thick as rifle primers you may get slam fires.

Yes, I've heard this before. IIRC SRP's are .020" cup and the NATO 5.56 specific cups are .022"
Was asking because I have a couple of bolt 300BO's I'd like to load up without exhausting my remaining SRP's.

 

[Walkalong]

Do not substitute SP primers of any kind for SR primers, with .22 Hornet being an exception.

 

[twarr1]

I've long wanted to ask this question - What is the intended use of SPM primers?

 

[fxvr5]

I've long wanted to ask this question - What is the intended use of SPM primers?

From CCI: "Magnum Rifle/ Pistol Primers • Provide extra heat and ignition power • 20 percent hotter flame to light propellants in the toughest hunting conditions • No loss in sensitivity"

https://www.cci-ammunition.com/on/d...Documents/catalog/2021_CCI_catalog_single.pdf

 

[Klaatu Barada Nikto]

I've long wanted to ask this question - What is the intended use of SPM primers?

Bolt action 300BO.

 

[Sofie007]

I've long wanted to ask this question - What is the intended use of SPM primers?

When the reliably-sourced load data calls for them.

 

[Bazoo]

I use SPM for h110 in 357 mag. Sometimes have used it for 2400 but it's not needed there. It might not be needed with H110 but it's specified in the data I have. Where SPM primers may be needed, is during cold weather. I've been known to shoot in the cold, rarely however in the heat of summer.

 

[FROGO207]

SPM primers are used in loads that use hard to ignite ball propellants and loads that are going to be used in really cold weather. As Walkalong has mentioned they work for 22 Hornet I think of them as same as Remington 6 1/2 .