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RIO PRIMERS
Unread 03-17-2021, 10:51 AM   #1
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Default RIO PRIMERS

Just ordered from stock Rio 209's from Precision FYI
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Unread 03-17-2021, 12:54 PM   #2
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Better than nothing!!
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Unread 03-17-2021, 01:27 PM   #3
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They are out now.
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Unread 03-17-2021, 02:19 PM   #4
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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!!!)
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Unread 03-17-2021, 03:45 PM   #5
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Quote:
Originally Posted by Andrew Sacco View Post
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.
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File Type: png Primer Sizes.PNG (273.6 KB, 4 views)
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Unread 03-17-2021, 03:49 PM   #6
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Some primers burn hotter than others, so I would say the brand of primer can have a big impact on the recipe.
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Unread 03-17-2021, 03:57 PM   #7
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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
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Unread 03-17-2021, 04:17 PM   #8
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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!!
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Unread 03-17-2021, 04:22 PM   #9
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Thank you everyone for the tips. Mike, you're late to the soup kitchen you don't get the soupy. But then again, I've seen your reloading "room". I do not feel sorry for you : )
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Unread 03-17-2021, 08:27 PM   #10
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Prior to the current primer shortage one of my shooting buds often commented that Rios are too much trouble to use. I called him earlier and asked why that is ..... in addition to being somewhat oversize and thus hard seating in once-fired American hulls, their leading edge isn't as radiused as other 209 primers and can cause jams (in the seating station) of progressive loaders like MEC 9000's.

Last edited by Frank Srebro; 03-18-2021 at 07:45 AM.. Reason: Slightly reworded for clarity
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