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Rifles, Reloading, Optics, Equipment
Gunsmithing
Action Timing for Hunting Rifle
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<blockquote data-quote="nksmfamjp" data-source="post: 2081848" data-attributes="member: 1951"><p>Let's see if I can simplify. There is a certain amount of "firing pin fall" (distance from cocked to fired) that a rifle needs for ignition and I hear accuracy.</p><p></p><p>The way a firing pin gets from fired to cocked is by opening the action against the cocking cam on the bolt and pushing closed against the trigger sear.</p><p></p><p>The cocking cam force is about 80% of your force to open your bolt. You can slick this up, polish it, whatever, but it still will have pretty high force. If you time a rifle to have some cock on close, you can reduce the cocking force by changing the ramp....not sure if your smith intends to do that. </p><p></p><p>Cock on close will finish the cocking, but it will add force to the bolt stroke right before rotating it to lock the lugs. Running the bolt fast, you likely won't notice. If you are running a BR type rifle, you are trading open force for close force. As you heard here, most prefer no close force off the bench.</p><p></p><p>On a hunting rifle, I prefer a bit of cock on close and a polished cocking ramp for smooth cock on open because I'm running the action fast with little thought other than overall smoothness.....hmm I forgot to discuss with my gunsmith on my current rifle build, but i sent a model 70 action that was well timed by my opinion.</p></blockquote><p></p>
[QUOTE="nksmfamjp, post: 2081848, member: 1951"] Let’s see if I can simplify. There is a certain amount of “firing pin fall” (distance from cocked to fired) that a rifle needs for ignition and I hear accuracy. The way a firing pin gets from fired to cocked is by opening the action against the cocking cam on the bolt and pushing closed against the trigger sear. The cocking cam force is about 80% of your force to open your bolt. You can slick this up, polish it, whatever, but it still will have pretty high force. If you time a rifle to have some cock on close, you can reduce the cocking force by changing the ramp....not sure if your smith intends to do that. Cock on close will finish the cocking, but it will add force to the bolt stroke right before rotating it to lock the lugs. Running the bolt fast, you likely won‘t notice. If you are running a BR type rifle, you are trading open force for close force. As you heard here, most prefer no close force off the bench. On a hunting rifle, I prefer a bit of cock on close and a polished cocking ramp for smooth cock on open because I’m running the action fast with little thought other than overall smoothness.....hmm I forgot to discuss with my gunsmith on my current rifle build, but i sent a model 70 action that was well timed by my opinion. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Gunsmithing
Action Timing for Hunting Rifle
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