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Rio Primers

6234 Views 28 Replies 10 Participants Last post by  Ned S
From: Carol Lister
Date: Mon, May 04, 2009 - 01:28 PM ET
Website Address:

Congratulations on not having split your chamber yet, Longshot. Obviously you haven't read everything that matters on the subject. Quote of a letter on the subject from Alliant:

"I am Dick Quesenberry, Product Manager for Alliant Canister Powder. Ben and I have discussed your e-mails and problems with Rio primers and our product. I apologize for the difficulty that you have encountered and appreciate you using our product.
We just completed work for the new revision of our Reloaders Guide, which was very badly needed. During this effort we tested all primers in a standard controlled load for both straight wall and tapered shells to correlate their brisance. The following conclusions were drawn from that effort:

· Primer brisance will vary from Lot to Lot within the same brand. Most vary within SAAMI safety limits but Rio was found to be extremely variable.

· We do not publish reloading recipes using Rio primers for the above reason

I have also talked to Kevin at Down Range (who happens to be a great guy) and he agrees with our findings.

If I was forced into recommending load data using the Rio 209, I would have to recommend loading like the Federal 209A and that may still give slightly higher velocities and pressures. ...

Call them an verify if you care to; I don't make this kind of stuff up just to annoy people like you. BTW, the original inquiries involved Promo, Red Dot and Clay Dot.

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Thanks for that info 43x good to know.


Rob MacK
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