Thread: 300wsm primer choice

Evening all,

I have both 210 and 215 feds on hand 215 went swimmingly in my 7mmrm but in my saum and blaser mag I used 210 both to good effect any advise on which I should start with.im just trying to save some time and mucking around also a starting charge for 190gn weights and rl26. Lots of mixed reviews especially when googling the primer choice people are having good results with either . Berger has data for their 180s with rl26 so failing any first hand knowledge il drop down a gn and start from their. Cheers

I read that if you are using a powder charge of 60 grains + it is better to use a magnum primer. But in saying that the standard ones would be OK, I use standard primers in everything up to 30 06 then in the magnums the magnum primer.

Originally Posted by mimms2

The difference primers are going to make would be minimal. Might tighten up your ES, but that's well down the development path.
210.
Both data sheets for rl26, and your projectiles, should have load data to strt from.

Cheers @mimms2 210 your preference? Iv always being incredibly lucky with reloading ragged hole first time until the saum which was easily overcome but the brief messing around revved me up . To be fair until the Saum I never even looked at ES not once and have had a few dependable 1km rifles now so maybe il just go with the flow

@Mooseman this is where Google and majority American based forums get confusing because people are doing great things with both and iv read 70gn and 60gn as the cut line between mag and large. My rm was +70 the rest sub 70 . Might have to stop skimping on time and go have a bomb up

Originally Posted by mimms2

The difference primers are going to make would be minimal. Might tighten up your ES, but that's well down the development path.
210.
Both data sheets for rl26, and your projectiles, should have load data to strt from.

Do you mean tighten ES by using the mag primer or the standard primer for a SAUM or Blaser Mag?
I have both but use 215s for all mags. Never considered 210s.

Greetings All,
I used Winchester Large Rifle primers in my 7mm SAUM and could not reach the velocities in the data for AR2213SC and AR2217 in spite of the 26 inch barrel. I had used the Winchester primers thinking they were hotter and I did not have any magnum primers at the time. Factory 150 grain loads chronographed 3,060 to 3,080 v the claimed 3,110 fps. Some 215 GM primers were aquired but I have not done much testing since. Later I read some pressure tested data on different primers in the 7mm RM and the .300 WM with H4831. From memory the 210 and 215 primers were much the same but the Winchester WLR primers gave high pressures, very high with the WLRM primers without any real increase in velocity. The tests appeared in different issues of Handloader 5 to 10 years back.
Standard primers may give good to excellent results in magnum cases (say over 60 grains capacity) on balmy testing days and fail miserably on a freezing winter day. Some have found this out the hard way.
Regards Grandpamac.

Yes. I read a while ago that magnum primers were developed at request of military because of failures / erratic ignition with "normal" primers in very cold conditions.

magnum primers where made to give consistent ignition to magnum cartridges why bother with anything else I use CCI magnum large rifle primers number 250,70 grains of win 780 powder (said tobe one of the harder powders to ignite) 178 Amax projectiles with GOOD reliable results and good ES in my 300WSM in all weather /temp conditions.

Originally Posted by Jit

Do you mean tighten ES by using the mag primer or the standard primer for a SAUM or Blaser Mag?
I have both but use 215s for all mags. Never considered 210s.

I used 210s in both my saum and 7BM both amazing rifles only ever used the 215 in my rem mag

Brilliant cheers lads

federal magnum match primers

Originally Posted by Rock

federal magnum match primers

this is what I use in magnum and also in std cartridges that I use ball powder in