ORIGINAL: DeerSlayer53
This one guy at Kames said that if you use a 209 primer then it might effect your accuracy because it has too much of a blast. So..when the trigger is pulled, (if your using 777 pellets) the blast goes throught the holes in the gunpowder and hits the rear of the bullet - displacing it - before the gunpowderevenignites, effecting your accuracy. He told me to use a 410 primer instead (for better accuracy). Is this true????
I don't know if this is true or not, but years ago, I was using loose Pyrodex with a nipple adapter on a caplock rifle that took small rifle primers. After shooting and chronographing a ten-shot string with this device, I removed it and installed a regular nipple that used No. 11 caps. I then shot another ten-shot string, which I also chronographed.
Not only did the ten shots fired with the regular No. 11 caps group much more closely (100 yards) than had the ten using the SR primers, but the extreme variation in velocity dropped from 110 FPS to just over10 FPS.
So, in this test, the less powerful primers worked a lot better!