RIO PRIMERS

[Big D]

Tom Roster has tested various primers side by side. Not much difference in velocity, slightly more in pressures.

http://www.armbrust.acf2.org/primersubs.htm

[Mike of the Mountain]

I use Winchester, CCI, Nobel and Fiocchi primers. Cheddite hulls I use Nobel and Fiocchi. Domestic hulls I use Winchester and CCI. I go by primer pocket size only.

BTW, they are out of Rio primers now because Andy had to post that they had 209 primers. Way to go Andy!!

[Stan Hillis]

Originally Posted by John Dallas

Tom Roster has tested various primers side by side. Not much difference in velocity, slightly more in pressures.

http://www.armbrust.acf2.org/primersubs.htm

Tom Armbrust has noted differences in patterns when primers are switched.

http://www.armbrust.acf2.org/primersubs.htm

Stan

[Randy Roberts]

Originally Posted by John Dallas

Tom Roster has tested various primers side by side. Not much difference in velocity, slightly more in pressures.

http://www.armbrust.acf2.org/primersubs.htm

John that is the exact article I was recalling. When I look at Table II I read this as an experiment where various primers were substituted within the same reload that produced pressures that varied as much as 3,320 LUP (wish it would have been stated in PSI). Roster goes on to state that this is "nothing to disregard to say the least". You refer to this as "slightly more in pressures". To me this seems significant. I do not profess to be knowledgeable in ballistics so please educate me, what am I missing ? His writings are the primary reason I never substitute primers or any other components that are not proven.