RIO PRIMERS

[Andy]

Just ordered from stock Rio 209's from Precision FYI

[Mike of the Mountain]

Better than nothing!!

[Jeff K.]

They are out now.

[Andy]

Total newbie stupid question: Are 209 primers interchangeable (other than Cheddites which I know are sized different....). I know some manuals say "DO NOT INTERCHANGE PRIMERS OR YOUR HOO HOO WILL FALL OFF...." But if I'm shooting lead bullets in my 9mm they don't care if they're CCI, Winch or Federal, they go bang and shoot the same. I have 5,000 Cheddites and now 5,000 Rio's on the way (no shot or powder, but hey!!!)

[Randy Roberts]

Originally Posted by Andrew Sacco

Total newbie stupid question: Are 209 primers interchangeable (other than Cheddites which I know are sized different....). I know some manuals say "DO NOT INTERCHANGE PRIMERS OR YOUR HOO HOO WILL FALL OFF...." But if I'm shooting lead bullets in my 9mm they don't care if they're CCI, Winch or Federal, they go bang and shoot the same. I have 5,000 Cheddites and now 5,000 Rio's on the way (no shot or powder, but hey!!!)

Andy:

You can go to my local trap club any Tuesday and sit at the round table of knowledge and I can promise you there will be at least a dozen rocket scientist that will tell you any primer will work in any load. My approach is if it is not in the loading manual or has not been tested I am not touching it. I think it was one of Rosters studies that showed an increase of almost 2,000 psi could be achieved by a simple primer interchange. I think it was Roster, others will correct me if I am in error on that.

If your question of interchanging primers was geared more towards size then see the attached chart. Looks to me like once you use a RIO you have eliminated several of the others based upon the diameters.

[John Davis]

Some primers burn hotter than others, so I would say the brand of primer can have a big impact on the recipe.

[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.