Large rifle primer vs small rifle primers - 6mm

[huntsd]

School me on the differences. Is the argument that small will be more consistent and is less wear on the primer pockets. Large is better for hunting in low temps?

Question is specific for 6mm cartridges

 

[kpk]

yes and yes.

I just ordered large simply because I have twice as many large primers on hand.

 

[wind gypsy]

Small: More brass thickness around pockets so primer pockets are more resistant to expansion from pressure. SRPs can be slightly cheaper and more available.

Large: Put out more spark which can be helpful depending on how much powder you're trying to light, temperatures, and how much spark a given powder needs to function reliably.

Single base stick powders typically require less spark than double based or ball powders.

Lots of people do well with SRPs in cold weather still. I prefer a little extra buffer with LRP and i've always had plenty LRP to keep up with needs.

 

[huntsd]

Small: More brass thickness around pockets so primer pockets are more resistant to expansion from pressure. SRPs can be slightly cheaper and more available.

Large: Put out more spark which can be helpful depending on how much powder you're trying to light, temperatures, and how much spark a given powder needs to function reliably.

Single base stick powders typically require less spark than double based or ball powders.

Lots of people do well with SRPs in cold weather still. I prefer a little extra buffer with LRP and i've always had plenty LRP to keep up with needs.

are es/sd typically better with small?

 

[Ice-kub]

Serious question to add to the above question. What about small rifle magnum primers for a use case in cold environment?

 

[Ac338]

Serious question to add to the above question. What about small rifle magnum primers for a use case in cold environment?

I’ve been using srp Rem 7 1/2 in my 223 AI coyote gun for the last three years and I’m yet to have a misfire. A few nights ago we were at -16 and with gun and ammo being in the bed of the truck for 6 hours it still went bang when I needed it

 

[Ice-kub]

I’ve been using srp Rem 7 1/2 in my 223 AI coyote gun for the last three years and I’m yet to have a misfire. A few nights ago we were at -16 and with gun and ammo being in the bed of the truck for 6 hours it still went bang when I needed it

Good to know! Any issues with pressure when getting up into more mild or hotter temperatures?

 

[Ac338]

Good to know! Any issues with pressure when getting up into more mild or hotter temperatures?

I haven’t noticed any pressure signs I haven’t shot that load in any temps over 50-60 degrees though. 50 grain vmax 26.0 grains of h335

 

[Lawnboi]

I’m assuming you’re talking 6creed.

I just buy LRP brass to avoid ignition problems. It’s not 2020 anymore and large and small rifle primers are attainable. I have shot both and see zero difference besides I have seen srp creed brass have hang fires in cold temps.

In the larger cases LRP also handle pressure to the primer better. Both will last a barrel if you’re getting quality brass.

 

[S.Clancy]

My experience with SRP's in cold temps has been awesome. I just use CCI 400's, have shot as low as -5F or something with no trouble firing.

I think people that run into trouble are shooting powders where you are using 45-48 gr. I'm shooting 41-41.5 gr of H4350 and it's fine.

I will say I saw CCI 200's and 400's are the same price at Scheels, so it's kind of sixes. I have 6 reloads on my SRP brass and it looks great.