Firing Pin Travel

[BillPa]

and was wondering if adjusting the travel to a shorter stroke would make a difference.

Oh it will, but it will also shorten the pin fall length and the amount of spring per-compression. The amount of pin fall is determined by the length of the cocking ramp excluding any over/under cocking at sear hand off. In fact you can back the cocking piece off enough the pin won't be moved at all when cocking the bolt.

Bill

[BigDave]

This thread is not that old. So, I will add this very interesting link. The article agrees with .035". It also mentions overall spring length and some tips for adjusting things.

http://www.savageshooters.com/conten...rotrusion-Data

[hothead]

Not to start an argument, but I was told by a member of Team Savage F/tr team to set protrusion at .060. which I did. I am shooting very stout loads
in the 308 from the Savage custom shop and primers look good. I'm shooting 155.5 gr Berger's at 3070 fps. just to say how hot of a load it is.
I have no cratered primers. the rifle is shooting awesome. like .4 moa at 300 yards for 10 shot groups.
hh

[BillPa]

Not to start an argument, but I was told by a member of Team Savage F/tr team to set protrusion at .060.

I have no cratered primers.
hh

The pin protrusion has nothing to due with cratering-blanking primers, its a result of the pin to pin hole fit, the tip profile, insufficient spring tension to support the indentation, the primer cup or a combination of them.

Sharpshooter has (tried?) educated us a few dozen times why less equals more where pin protrusion is concerned.

You, I or anyone else will ever indent a primer more than about .020", the anvil stops the pin forward at that protrusion length regardless if it set longer on the bench.

A firing pin isn't instantly accelerated to X velocity by the spring, it ramps the pin up in speed. Anything that reduces it fall length or restricts it's fall also reduces it's impact energy, that E=M*V thing. Round numbers, with pin set to .060" protrusion the pin fall length is shortened .040" when it strikes a primer whereas one set to .030"-.035" its fall length is only reduced .010-.015" allowing more time for the pin to accelerate thus increasing it's impact energy.


Bill