Quote Originally Posted by sharpshooter View Post
Well, it's pretty simple, but most people don't have the tools or measuring equipment to get the numbers.

Firing pin travel to the boltface, which is total travel, minus firing pin protrusion. (for example) .285" total travel......minus .035" protrusion, = .250"
Net spring force, which is force at full cock, minus sear drag. (for example) cocked 23.5 lb....minus sear drag of 4.2 lbs = 19.3
.250 x 19.3 = 4.825
I really hate posting here again, but could someone interpret my measurements on one of the dreaded New style bolt/pins?
Pressing on the bathroom scale with the cocking indicator touching my thumb in the BAS hole I get 23.5 lbs on the short spring, 32 pounds on the midlength spring, and forget it with the big spring, over 40 lbs.

Here's the "INPUT DATA" for the small, weak, worn out spring installed in an assembled bolt.
Force required to lift off cocking notch 24.5 pounds.
Force require to lift off Bolt Head @ full fall, 10.5 lbs.
Using this and a 200 pound industrial scale.


Pin measurements (from cocking indicator)
Cocking notch, 0.005" to indicator,
Cocked and on sear 0.028",
Fired 0.288".
Protrusion is 0.044-0.045"

I think there was a formula posted in one of these threads.
Found it.
Sounds like I will lose about 0.020" in pin fall (at full impact of primer) from a 0.045" protrusion, and about 4 pounds due to sear/cocking pin friction/drag.

So far, this rifle has had ZERO Misfires :)
(out of ZERO shots)