Craig, in your last paragraph about the depth of the crimp or possible primer substitution, Joe Wood loaded that exact recipe but doubled the powder and if you look at his post with the picture you will see it did not or could not crimp.
Also unless it was a magnum primer such as a Federal 209M or CCI 209M the increase would not be substantial....
There a Tom Armbrust article I believe on his website floating around on the net that shows about 1500psi swings just on primer swap (different powder on that test). Also, he showed a target load using Clays powder that rose about 1800psi only on depth of crimp changes. There were some folks that thought the original load was on the warm side for the gun, and I was thinking small variances might have been feeding the gun higher pressures than it seemed.
