Peep, low brisance was written and talked about back into the 1800's - Helford and Mann ...
When black was the only powder, there were black powder primers with low bisance.  Then came semi and smokeless powders.  The shooters complained their rounds weren't igniting properly.  So the primer companies increased the charge and even added such stuff as ground glass.  Then with the invention of powders for the wildcats, more primer changes to ignite the powders, glass and aluminum.

Us poor BPCR shooters were now without BP primers and had to devise the use of primers to deflagurate the powder - not whack the bottom of the charge and explode it.

Yes, Garbe & MLV did advocate magnums but if you go down the match equipment listing and the discussions on the BP forums - folks have moved to low briance primers as was advocated by the writers of the 1800's.  About the only BPCR shooter that has any of the old BP primers that came up in a thread discussion of briance is Kenny Wasserberger

I think that in the days of magnum primer recommendations that most people were using Goex powder and Swiss was a new thing in America so the powder has changed as well.

  You can still develop good loads with magnum primers if you work at it.  I find that Federal Magnum Match primers work well with reasonably large charges of Fg Goex.  My CSA .45-70 shoots ten shot strings with 76gr of Goex Fg with velocity standard deviations of 5fps or less.  My last chrony session showed an SD of 4.5 which is not too bad in my books.

With that said I use CCI BR2's in most of my BP loads and pistol primers in the smaller cases.

Chris.

When looking at high speed pictures showing the Brisance difference in the primers currently being offered gives one a better understanding of the Mag primers. For example the Win. Large Pistol and Win. Large Rifle Magnum are identical and some of the other Mag. primers are not as harsh as some of the non magnum primers. One primer that was an eye opener to me in the small variety is the Rem. 71/2BR's, it's a blow torch and has far more Brisance then any Mag both large or small yet produces extremely good accuracy results. The word Mag. added to a primer is really a misconception.

JLouis

Here is the article on the Large with photos.
(You need to Login or Register to view media files and links)

Your 215 primers just might be the cat's meow for you so not to worry. I have found the only true experts are us the ones thinking outside outside the box that find by trial an error those things that work better than what the so called experts spout. Not all things are equal when it comes to what works best in each individual's rifle yet we are told daily that only this powder and this primer and this alloy and this bullet design will only provide thee best results. I have found out over the years it is all hog wash and you best find what truly works on your own by trying every combination one can come up with as there is one out there that will truly be special just for you.

JLouis

I'm still using Federal LR Mag. Match Primers and Goex Cartridge Powder that are 13 years old....
Gotta use them up..

Terry

I am anxious to see LR, SR test results JohnBoy it should prove to be very interesting. There was a real good article in a past Journal with flash photos that centered more around the primers we typically use. Having both Salazar's and the Journal's articles makes the primer study allot more comprehensive.

JLouis

The SR tests would be interesting indeed.  I'm sure that someone here must have had some RMC cases cut for small rifle primers eh?

Chris.