Primers backing out?

[Smellydog]

Lovex DO73.5 (same powder as AA2460), it’s a great powder, one of two that will get my 25-45 to 1700 ft-lb .

No pressure signs and it could be pushed quicker but accuracy was best at that speed and weight.

I'll have to look out for some!

 

[NP435]

No not at all. The primer always backs out first in any action. By default there is always an amount of headspace for reliable functioning.
As pressure drops the case let's go of the chamber wall and follows the primer to the bolt face swaging over the primer.

Thank you for posting this, I was going too but now no need.

 

[kenbro]

Well, I only loaded 7 rounds with N133.
Guess work, so with a bit of help from 30-30 data I started at 34 grains, 34.5, 35, 35.5, 36, 36.5 and 37.
At 50 yards they were stringing vertical but the last 3 were touching each other vertically.
Primers stopped backing out at 35.5 grains with just the slightest hint of the primer changing shape, but not enough to bother about.
Velocities started at 2397 and went up to 2655 Fps.
So it looks like N133 is going to replace 3031 and H4895.
Very pleased that job is finished.
Thanks to all for the help.
Ken.
Ps. Also tried N133 in my Tripple 2.

 

[Smellydog]

Well, I only loaded 7 rounds with N133.
Guess work, so with a bit of help from 30-30 data I started at 34 grains, 34.5, 35, 35.5, 36, 36.5 and 37.
At 50 yards they were stringing vertical but the last 3 were touching each other vertically.
Primers stopped backing out at 35.5 grains with just the slightest hint of the primer changing shape, but not enough to bother about.
Velocities started at 2397 and went up to 2655 Fps.
So it looks like N133 is going to replace 3031 and H4895.
Very pleased that job is finished.
Thanks to all for the help.
Ken.
Ps. Also tried N133 in my Tripple 2.

Good velocity that Ken.

How'd it go in the 222?

 

[kenbro]

Good velocity that Ken.

How'd it go in the 222?

222 x N133 x 20” barrel.

 

[kenbro]

Ps. These were only shot at 50 yards.

 

[Smellydog]

Looks promising