I'm consistently getting asked the same question: Q: "What primer should I use with your Remington 700 ML 209 conversion kit?
I usually give the same answer: A: "I use standard CCI 209 primers. They have never given me any trouble, but it may depend on what powder and bullet you chose."
Then the next question either goes: Q: "But the Blackhorn 209 site recommends, CCI magnum 209 primers?"
A: "That is true, however I've had the Magnums stick in the bolt nose at lower powder charges and require a dry fire to remove, so I personally stay away from them. If you don't mind dry firing in-order to get the spent primer out of the nose, or you work up to higher charges, you can use them (or any other 209 primer). I've personally had great accuracy and performance with the standard CCI and Blackhorn 209. So I stick with and recommend them."
Or the next question is: Q: "I'm using Pyrodex/TripleSeven/Black powder, I've heard full power primers are too powerful, and will drive the powder down the bore, un-compacting it, and gives inconsistent performance, and poor ignition."
A: "That can happen. I believe its most probable with loose fitting projectiles. I stuck with tight fitting Sabots and standard CCI's and was OK back when I shot TripleSeven. Feel free to follow proper load development practices and experiment with other 209 primers. I myself have always been pleased with standard CCI's."
"So if standard 209's are not giving you the accuracy you want with black powder substitutes other than Blackhorn209, you may want to try the low power "black powder" only primers. I'd try the ones with the same name as the powder you are using. However, understand, that they may stick in the bolt nose and require a dry firing to remove. "
If Blackhorn 209 is legal for hunting in your state (and it is in most), I suggest you give it a try, and only with regular full power primers like the standard CCI. It has given me better performance in every way imaginable. But remember Blackhorn209 will not work with the low powered "black powder" primers; they don't have enough heat to consistently and fully ignite Blackhorn 209.
Check out the video below for real world examples of our Remington 209 kit using regular CCI's functioning just fine with Blackhorn 209
In the video below I shoot a rifle I just converted to sealed breach 209 primers. I used Blackhorn 209 and CCI magnums at 80 grains by volume (a minimum charge), and I got a few sticking primers that required a dry-fire to remove.
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