I have a Knight Original DISC, that I just converted to bare primers with a Lehigh BP, Lehigh Adaptor and a new bolt body.
I was getting ready to order the 0.248" OD shims (0.005" thick) to shim the primer pocket on my knight. The bolt handle falls without contacting the action and crushing the W209 primers I was planning to use. (the one used for testing the fit measures 0.301" ) Using feeler gauges, between the bolt handle and the contact point on the frame, I determined I need a minimum of .012" before I either run the bolt into the action or until I hit the primer. (Can't tell which for sure, it seems like the bolt hits the action at the same time the bolt face hits the back of the primer.) I was planning to just install one shim at a time until I got some primer Crush and ZERO headspace, with the W209 primers.
Just for fun I decided to measure some of the W209's just to see how much variance they have. Turns out, the W209 primers I have vary in length from 0.296" to 0.301" (These were purchased this year. ) And I only measured the first row of 10. ( 3 were 0.300"- to 0.301", 4 were 0.296" and the other 3 were in between )
That got me thinking, how much is too much crush?
If my measurements are correct and three 0.005" thick shims (0.015" total thickness) , gives me 0.003" of crush on a 0.301" tall primer. At the same time I would get 0 crush on the 0.296" primers.
IF my measurements are correct a 4th shim would give me a total thickness of 0.020" and 0.002" crush on the short 0.296" primers. At the same time I would get 0.007" crush on a 0.301" primer.
IS 0.007" crush too much?
I was getting ready to order the 0.248" OD shims (0.005" thick) to shim the primer pocket on my knight. The bolt handle falls without contacting the action and crushing the W209 primers I was planning to use. (the one used for testing the fit measures 0.301" ) Using feeler gauges, between the bolt handle and the contact point on the frame, I determined I need a minimum of .012" before I either run the bolt into the action or until I hit the primer. (Can't tell which for sure, it seems like the bolt hits the action at the same time the bolt face hits the back of the primer.) I was planning to just install one shim at a time until I got some primer Crush and ZERO headspace, with the W209 primers.
Just for fun I decided to measure some of the W209's just to see how much variance they have. Turns out, the W209 primers I have vary in length from 0.296" to 0.301" (These were purchased this year. ) And I only measured the first row of 10. ( 3 were 0.300"- to 0.301", 4 were 0.296" and the other 3 were in between )
That got me thinking, how much is too much crush?
If my measurements are correct and three 0.005" thick shims (0.015" total thickness) , gives me 0.003" of crush on a 0.301" tall primer. At the same time I would get 0 crush on the 0.296" primers.
IF my measurements are correct a 4th shim would give me a total thickness of 0.020" and 0.002" crush on the short 0.296" primers. At the same time I would get 0.007" crush on a 0.301" primer.
IS 0.007" crush too much?