Magnum or Standard small rifle primers for 300 whisper?

[jripper]

Which should I be using for loads with W296 and AA1680. I have been using Federal standard small rifle, and seem to run into high pressures pretty quickly. Will magnum primers make any difference?

Any input would be appreciated.

[Zed Stewart]

I think all of JD Jones' data was done with Rem 7 1/2 primers which are standard small rifle primers. However, if I remember right Federal primers are the softest with Winchesters being the hardest.

[HHI 812]

I've used 7 1/2 Rem for all my reloading in the 300 Whisper. Didn't think I needed a hot spark for such a little case. When I did a lot of reloading for my 454's, Dick Casull told me he found the 7 1/2 Rem had the hardest cups, and the Fed 205 next in hardness. Use to really load them hot in the early days, constantly stretching the primer pockets, which I have also done as well with some 300 Whisper early load developments. I found the standard primers to be more consistent for me also, and thus better accuracy. Out of my 10" blue SSK 300 Whisper, I get 2000+fps with a Nosler 150 BT, and Rem 7 1/2 primer. A little on the warm side with H110. With the old W680, velocities are just slightly under 2000fps, but primers show a lot less pressure signs. Unless your really going to push it, I think standard primers is more than enough.

[Cornholio]

Standard for me as well.

[gary0529]

FWIW,

Gentlemen,
My experience with primers in a side by side comparison is that CCI Small Rifle Magnum primers printed appx 3/4 in high and 1/4 in left through my bolt whisper.
Did the test for grins and really did not expect much and was surprised just a tad by the shift in POI.
The load was 7.5 gr. Accurate #7, 220gr. Sierra HPBT in once fired 221 Fireball cases.
With both "regular" CCI primers and the Magnumn varieties the groupings stayed a very acceptable .4" at 100 yards- that is about the best my aged eyes can hold a grouping.

Din NOT drag the Ohler chrono out for the test but the regular primers with that combo are right in the 1050 range through my 18 in. barrel -Gemtech suppressor - at 75 to 80 degrees.

That's it. Just a bit of near useless information for the masses.

Gary

[Cornholio]

Originally Posted by gary0529

That's it. Just a bit of near useless information for the masses.

Gary

Hardly! That sounds like a sweet load to try out! Thanks!