Breech Block Failure 1916/1920 Erfurt

Allen Brett · 01-26-2021, 05:58 PM

Thank you for all of the comments and especially to G.T. for his generous offer. I decided to try one last procedure and I think this the best so far short of an actual gauge. I took a piece of spent brass, removed the primer and put it through the sizer in my loading die then measured the case length at 0.747 and chambered it no issue. I then added a trimmed tape disc up until the bolt would not close with a light steady pressure. I measured the casing with the tape disk on it that would not allow it to go into battery with the noted light pressure and the length is 0.768. I also measured the factory loaded case I used prior and as G.T. stated it was exactly 0.744 which puts it .010 under the standard of 0.754. So I would think at 0.768 with the case not going into battery I should be within the "SAAMI chart is 0.754" and the maximum headspace is 0.776", or 0.022" difference."

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01-26-2021, 05:58 PM	#11
Allen Brett User Join Date: Nov 2017 Location: Central Wyoming, USA Posts: 49 Thanks: 78 Thanked 26 Times in 13 Posts	Thank you for all of the comments and especially to G.T. for his generous offer. I decided to try one last procedure and I think this the best so far short of an actual gauge. I took a piece of spent brass, removed the primer and put it through the sizer in my loading die then measured the case length at 0.747 and chambered it no issue. I then added a trimmed tape disc up until the bolt would not close with a light steady pressure. I measured the casing with the tape disk on it that would not allow it to go into battery with the noted light pressure and the length is 0.768. I also measured the factory loaded case I used prior and as G.T. stated it was exactly 0.744 which puts it .010 under the standard of 0.754. So I would think at 0.768 with the case not going into battery I should be within the "SAAMI chart is 0.754" and the maximum headspace is 0.776", or 0.022" difference."