I’m reasonably sure I know what caused this problem, but I want to run this past all of you anyhow.
Here as a little background on the problem. The rifle is a Kelbly BB Panda action with a 1-10 twist 308 barrel. I bought the barrel as a blank and had it chambered up by a well-known gunsmith late in the season of 2018.
I started break-in/load development with new Alpha brass that had been neck sized only and only about 30% of the rounds loaded would fire using CCI 450 primers.
I didn’t mess with this rifle until a few weeks ago and bought 200 pieces of new Peterson brass. (Couldn’t seem to locate the Alpha brass) Again, neck sized only and the same issue appeared again. I took measurements from fired brass, as opposed to new and the new brass is .007 shorter as measured to the datum line of the shoulder.
Well that explains the FTF, but the “why” is the question.
My solution:
I started to do a little load development with the Berger 200-20x bulled jammed .010 but the results were poor. So rather than burn up components and bbl. life, I gave a modified COW method a try.
I put 15 gr. of VV 3N37 in a case with a small wad of paper towel and lit it up with a small pistol mag. primer. (I’m reasoning that the pistol primer would light up easier that the hard cup #450 primer.)
SUCCESS!! Now all the brass measures the same.
Your thoughts as to what caused this issue are welcomed.
Thanks,
Lloyd
Here as a little background on the problem. The rifle is a Kelbly BB Panda action with a 1-10 twist 308 barrel. I bought the barrel as a blank and had it chambered up by a well-known gunsmith late in the season of 2018.
I started break-in/load development with new Alpha brass that had been neck sized only and only about 30% of the rounds loaded would fire using CCI 450 primers.
I didn’t mess with this rifle until a few weeks ago and bought 200 pieces of new Peterson brass. (Couldn’t seem to locate the Alpha brass) Again, neck sized only and the same issue appeared again. I took measurements from fired brass, as opposed to new and the new brass is .007 shorter as measured to the datum line of the shoulder.
Well that explains the FTF, but the “why” is the question.
My solution:
I started to do a little load development with the Berger 200-20x bulled jammed .010 but the results were poor. So rather than burn up components and bbl. life, I gave a modified COW method a try.
I put 15 gr. of VV 3N37 in a case with a small wad of paper towel and lit it up with a small pistol mag. primer. (I’m reasoning that the pistol primer would light up easier that the hard cup #450 primer.)
SUCCESS!! Now all the brass measures the same.
Your thoughts as to what caused this issue are welcomed.
Thanks,
Lloyd