ronlaughlin

Hope you do not mind me re-posting the information over here from MM in my repsonse. I think it is very positive when two people conduct about the same type testing and come up with information that is close to the same..

A couple of years back Toby conducted some testing also. I am not sure how his results correlate with yours, but here is his information.

http://www.hpmuzzleloading.com/Technical3.html

Basically he came up with these velocities.

Shotgun Primers

Winchester 209ML ........................221 f.p.s.
Winchester 209 Triple Seven ML......244 f.p.s.
Remington 209 Kleanbore ML .........318 f.p.s.
Std. Winchester No. 209A ..............336 f.p.s.
Remington STS.............................338 f.p.s.
Std. Remington No. 209 ................341 f.p.s.
Cheddite No. 209 .........................347 f.p.s.
CCI 209M.....................................379 f.p.s.
Federal No. 209A ..........................381 f.p.s.

Rifle/Pistol Primers

Winchester WSP "Small Pistol" ….......116 f.p.s.
Winchester WSR "Small Rifle" ..........143 f.p.s

But, as you have already verified - these pressures can be a function of the breech plug. Which also interests me...

I think the difference between the CCI-209m and the Fed-209a is minimal - however the US military contracts the 209a as being the hotter primer for them.... but how do you tell when they are that close...