firing pin fall

[chet]

how much is too much firing pin fall ect, what fall is optimal ect.

chet

 

[cw308]

Chet
When reading about lock time for benchrest shooting I changed my pin spring to a special spring didn't see any change went back to the standard spring and it's staying that way . Never worried about how hard or deep pin fall is . What problems if any are you having , Are you loading hot ? How are you seating your primers ? Are you uniforming the primer pockets ? What's your headspace at ?

Chris

 

[Bart B.]

Too strong of springs makes trigger pull hard to manage.

Weak springs won't fire primers uniformly. Evidenced by vertical shot stringing at longer ranges. Or lower muzzle velocity average and greater spread.

Replacing factory springs with one rated 10% more often helps. Check the rating for your rifle here:

https://www.gunsprings.com/

 

[dstoenner]

I think ihave read before that the fired position tip should be between 45 and 60 mils

David

 

[Bart B.]

I think ihave read before that the fired position tip should be between 45 and 60 mils

55 thousands has oft times been minimal protruding from bolt face.

Primers need at least 25 thousandths sent to fire,more for uniformity.

 

[Ledd Slinger]

Ideally you would want to maintain at least .240" pin fall and pin protrusion of at least .060"

Cant really fully time a trigger on a factory 700 and keep .240" pin fall. Not a problem on good custom actions tho.

Jewell triggers increase the pin fall on a 700 as the sears are set a little further rearward, but that also takes it further out of timing for smooth cycling. If you try to keep over .240" on a factory 700, you will get the nasty 'cock on close'

 

[chet]

ok thanks for the dimension, .240 fall is what i will shoot for, i just want to check my Savage LRPV, if it's over cocking gonna get the grinder out.
chet

 

[oldduc]

ok thanks for the dimension, .240 fall is what i will shoot for, i just want to check my Savage LRPV, if it's over cocking gonna get the grinder out.
chet

On the Savage you can just back off the retainer that has the fingers on the back end. PTG recommends backing it off 4 turns and trying that, but do not back it off too far. Can be dangerous.

 

[chet]

On the Savage you can just back off the retainer that has the fingers on the back end. PTG recommends backing it off 4 turns and trying that, but do not back it off too far. Can be dangerous.

I never go about it that way, all you are doing is shortening the lift by the cocking pc starting contact at approx 1/4 way up on the ramp, does nothing to ease the lift, i still keep the cocking pc approx .010 off the bottom of the ramp. if you send your action to SSS Fred does it the right way. Kevin Rayhill does it correctly too. sear engagement has to be timed when doing it the way Fred at SSS does it.

chet

 

[oldduc]

I never go about it that way, all you are doing is shortening the lift by the cocking pc starting contact at approx 1/4 way up on the ramp, does nothing to ease the lift, i still keep the cocking pc approx .010 off the bottom of the ramp. if you send your action to SSS Fred does it the right way. Kevin Rayhill does it correctly too. sear engagement has to be timed when doing it the way Fred at SSS does it.

chet

I think folks are attributing too much magic to this process. There ain't no rocket science involved. Here are the instructions from Dave Kiff (PTG):