The 'old' CCI209M is basically the same as the 'new' CCI209M, without the step in the OD, paper covering the flash hole, and they no longer have a larger OD than most 209 primers as they used to have.

The CCI209M has always been more stout than any primer except the Federal 209A.

You folks consistently compare primers using relatively fast burning powders, which is incorrect.

If you want to compare primers and how 'hot' they are, you need to compare primers when lighting off large amounts of powders such as HS-7/571, Herco, Blue Dot and Steel. Then you will see the difference. Trying to compare primers using Clays, Red Dot, American Select, 700-X etc, is at best misleading.

Yes, they are all the same/identical primer, - just different marketing name. rio 209=Rio G-600=G-1000.

I disagree, - I think that you need to test the primers with the propellants for which it will be used with, not some propellant that you don't even have, use, or one that happens to shows the biggest difference.

We're not testing "primers" here (as in a "component"), we're testing a load as a "system" ('subsystem' to be more accurate) which has as one of its components: 'a primer'.

I have some 223 cases that are designed to shoot a .22 pellet powered by a 209 primer.
At one point I thought about chronographing the different primers... But it wouldn't mean anything of any relevance to anyone.

if they were from the 90's they'd be from the newer batch I have, so yeah I'm basing it on those.

I recently scored some CCI 209 in a trade for some powder. The carton looks relatively new but I can't say for sure. The lot number is AJ346 if that means anything.

I normally load 20 ga, 3/4 oz lead, claybuster wad, 12.2 grains of International and a Win 209.

Can I sub the CCI 209 for the Win 209 ?