Bench gun guys using Nesika went through this phase where they would use progressively weaker and weaker striker springs. The intention was to reduce the disturbance when the sear let go of the striker and to reduce the effort it took to cock the gun. The idea being it would disturb it in the bag less.
It does work I guess, but its a fine line and does not apply to all types of guns. Keep in mind that the BR stuff typically runs out to only 2-3 hundred yards. The cartridges used (that win anyways) are the PPC/BR types with big powder columns and small bullets. Small deviations in velocity don't equate to much on paper since the speed is so high anyways. Stretch your legs a bit and then you start to see interesting changes. Vertical strings, etc.
As far as bouncing goes. Ever frame up a wall? How is that when you are nailing a stud to a sill plate the two boards sometimes separate from one another after you give it that last good thump with a hammer?
Ok, back on track. 99.9% of the time you are WAY better off using a striker that has some mass in conjunction with a high energy spring. One of the chrome/silicon types. I think that spring should be changed once a year. It's cheap insurance in my book. Ensure the pin travels freely in the bolt and make sure the spring doesn't bind up. Give yourself about .250"-260" of pin travel and protrusion of around .050"-.055".
Do this and don't give it another thought. Obsessing over lock time is silly. The M-14 and M-16 prove this. Swinging hammers on rifles used in offhand competition at 200 yards? Are we nuts? No, it works and the guns hammer tacks. They shoot great at 600 too so something else must be happening. (It's the shooter. . .)
The RPA Quadlock has one of the fastest lock times out there. it doesn't use a spring (per say) it uses belvelle washers stacked up. the speed of the striker is phenomenal. It's also a pain in the neck to cycle the action and the trigger pull is very wild because of all the sear loading. Put a normal spring in it and it settles right down, has much nicer bolt manipulation, and still shoots great.
Attempting to build a field rifle like bench guns is a recipe for disappointment. Bench guns are very specialized and application specific. These same guys using the lighter springs to shoot small groups in the summer soon discovered that in cold weather the guns went to hell. The grease/lube got gummy and the primers need a really good hard whack to get things cooking. when the guns did go off, the groups just sucked eggs because ignition was so inconsistent. Normal springs fixed this.
Just little things that make big differences. . .
Hope this helped.
Last edited by NesikaChad; 07-24-2008 at 10:00 AM.