Ugh...I'm new to this. I have 5,000 primers for sale cheap : )

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

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

Stan

BWAHAHAHA!! Let’s say I’m not looking for primers!!

I use Win 209 and Cheddite 209's, have 3000 of each right now. I do use them interchangably. I look at my loads from Hogdon's and Alliant's reloading sites which most of the time will list loads with each of the primers, and there is not any significant difference. a 200psi difference and 25 fps is really not a problem with the low pressure, under 1200 fps loads that I gravitate toward. I have not noticed any problem with seating those 2 primers. I load Gun Clubs in 12 ga, Cheddite/RST 2 1/2" in 16, and AA and GC in 20's'. I dont sub Fed209m or CCIm.

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.

Shame on me! The data I posted was from Tom Armbrust, not Tom Roster

I am still calling him Roster :)

The digging around I have done in the past and info from powder manufacturers was as long as you are not substituting a Federal 209/209A or Cheddite 209 for another 209 style primer the difference is minimal and may even be lesser pressures/velocities depending on the original primer called for. The Federal primers are hotter than Win, Rem, CCI, Fiocchi, Nobel, Rio. Since we are loading on the lower end of SAAMI specs there are viable substitutions. Off the record info from manufacturers is yes, you can substitute the lower burn temp primers. On the record info is dictated by lawyers. It is what it is. :corn:

It amazes me how many people who reload are so concerned about component substitution (and rightly so), but only so far as it affects pressures. What kills birds and breaks clays reliably isn't proper pressure levels (although they are very important), it's good patterns. Component substitution can and will change patterns. I wish everyone was as concerned with their patterns as they are the pressures. But, they aren't.

I don't mean to sound like I'm preaching to the choir, but it seems to me that those of us who enjoy patterning are few and far between.

Powder Valley had Winchester primers as of 5pm. 50.00 per thousand.