I am loading some 30-06 rounds and the Hornady reloading book calls for #210 primers. I have about 50 of them I can use, but I want to load about 100 rounds. I have plenty of #200 primers of another brand that I can use, but I am wondering will using the differnet primers work? Will it affect the performance? And if it will work, should I do them all with the #200s, or some the them with #210s and the rest with #200s, or go out and buy some more #210 primers and don't use the #200s at all.

Changing primers can and often will cause changes in the load characteristics. The best thing you can do is buy more of what you developed that load with, and keep everything the same. If you wish to try another primer with that load, I would advise you to start over and see how it works. There may be no change at all, or there may be a change that would have caused problems if you had simply substituted as you asked about. Be safe........

Thanks, do you know if the 200s will work well, even though the books says to use 210s?

The 200's are small magnum pistol primers. The 210's are large rifle primers. That is what you use.

Yeah, from what I understand, using different primers can cause the powder to flash off faster than the load is intended for, thus causing too high of pressures. Its probably best to stick with what was recomended.

Well, this is the very first thing I should have told you...Have you even compared the two primers? That should give you your answer. Check it out.

stick with the 210's that is what i use in all my 30-06 loads

From a safety standpoint, you really don't have to worry about using primers of a different make in any except maximum loads! IF you are loading for the very highest possible velocity, you should re-develop your load using the new primers!

However, swapping brands may very well adversely affectthe accuracy of a given load that you worked up with the other make.

If you're talking about CCI 200 primers. Yes they will work. They are still large rifle primers. You may want to drop your charge down at least 5% and work your way back up.

For some unknown reason, I had it in my head that we were talking about Federal primers.Why, I don't know.......