Hello,
I'm wondering what the thickest primer is to use for a 6.5 Creedmoor with Lapua Brass using small rifle primers?
I'm shooting 147 eldms with varget. I did some pressure testing and got a max powder charge of 38.5 grains.
39 grains gave me 2729 fps
40 grains gave me 2817 fps
During testing, I saw no pressure signs on the primers, only had a mild extractor mark, and no hard bolt lift. So I backed off to 38.5 as a safe max, based strictly on velocity.
I shot a bunch of rounds with 38 grains of powder, giving me a little over a quarter minute at 400 yards. Tickled. I used up all those primers and went and bought 1500 more of the same kind- CCI #450. I loaded up some more bullets.
Before hunting season I had the gun out for a bit of practice with my golden 38 grain load. As I was shooting through the 10 or 15 that I had loaded up, I noticed that a couple of the primers were burning through. Well I guess I must be over pressure I thought and headed home.
So I loaded up some with 37 grains of varget and took them out to the range a couple of days ago. The are burning through as well. What the heck?
The only thing I can think of is that the new batch of primers aren't as strong as the old ones I had, even though they are both CCI 450. Anybody else run into this?
Are there any primers out there that are thicker than the CCI 450?
I also need to break out the chronograph again and check my velocities.
Thanks!
I'm wondering what the thickest primer is to use for a 6.5 Creedmoor with Lapua Brass using small rifle primers?
I'm shooting 147 eldms with varget. I did some pressure testing and got a max powder charge of 38.5 grains.
39 grains gave me 2729 fps
40 grains gave me 2817 fps
During testing, I saw no pressure signs on the primers, only had a mild extractor mark, and no hard bolt lift. So I backed off to 38.5 as a safe max, based strictly on velocity.
I shot a bunch of rounds with 38 grains of powder, giving me a little over a quarter minute at 400 yards. Tickled. I used up all those primers and went and bought 1500 more of the same kind- CCI #450. I loaded up some more bullets.
Before hunting season I had the gun out for a bit of practice with my golden 38 grain load. As I was shooting through the 10 or 15 that I had loaded up, I noticed that a couple of the primers were burning through. Well I guess I must be over pressure I thought and headed home.
So I loaded up some with 37 grains of varget and took them out to the range a couple of days ago. The are burning through as well. What the heck?
The only thing I can think of is that the new batch of primers aren't as strong as the old ones I had, even though they are both CCI 450. Anybody else run into this?
Are there any primers out there that are thicker than the CCI 450?
I also need to break out the chronograph again and check my velocities.
Thanks!