Very nice job.. that’s a great looking stock and nice grain. Been following this thread as I would love to have a 257 traditional stocked rifle myself. Great thread!
Thanks Mike! I've played a bit more and increased the strike length some 3mm. The power was down a bit as the hammer got lighter but swapping the main spring from 1.5mm wire to 1.6mm brought the velocity back to 990 fps. The problem with heavy springs is not the cocking effort (sidelever is easy to cock anyway) but the trigger gets heavier as there's more force pushing against the sear. As this is a BR gun a good trigger is one of the must haves. I'm actually not sure whether the current trigger pull is too heavy or not. The problem is that I need two tunes for this gun, one that slings those 257420s at 980+ fps for silhouette and another for BR where about 920 fps is enough (seems to be sweetspot for accuracy). I could use different springs and hammer for that but the threads on the block are already worn out so I'd like to switch tunes by RVA only.
Quote from: rkr on January 31, 2021, 07:23:42 AMThanks Mike! I've played a bit more and increased the strike length some 3mm. The power was down a bit as the hammer got lighter but swapping the main spring from 1.5mm wire to 1.6mm brought the velocity back to 990 fps. The problem with heavy springs is not the cocking effort (sidelever is easy to cock anyway) but the trigger gets heavier as there's more force pushing against the sear. As this is a BR gun a good trigger is one of the must haves. I'm actually not sure whether the current trigger pull is too heavy or not. The problem is that I need two tunes for this gun, one that slings those 257420s at 980+ fps for silhouette and another for BR where about 920 fps is enough (seems to be sweetspot for accuracy). I could use different springs and hammer for that but the threads on the block are already worn out so I'd like to switch tunes by RVA only.I re-read this thread and realized I was somewhat blending your and Denis' build in one. Now I have a better understanding of the 2 builds....That silhouette stock is sweet, I bet that really allowed you to focus on other areas during the shot, just keeping the gun vertical is no longer a major effort I'm sure.I know this would create a whole development project in itself, but I have seen balanced valves that behave very much like what you are asking for. Big porting, unregulated. Simply adjust the RVA to go up/down across say a 100fps range, while having good ES throughout that range of adjustment. The valve Bob described in his final version of the simplified balanced valve can very much perform this manner. I don't know if you recall when the original SS valves came out they delivered regulated-like strings in unregulated format. If you wanted to take it to the next level, this very well may be it----potentially with the added benefit of reducing hammer spring requirements having a positive impact on trigger pull. But I could also see the point of view where you have a good thing going with a proven, stable gun. I would almost be scared to touch it, lol...
Good shooting! 5 shot groups probably? There is one competition left although we shoot 13 shots and 10 best counts. But you probably noticed that on Sihry's page. That gun gonna be hard to beat at 5x5 Bech rest competition's if everything goes well... But that range what we use has own tricks to spoil groups but you already knowing that. wind is tricky there.Are you taking part on that last competition?
And now just give me that address where to send last competition's first price ?
Putting that lathe to good use! Have any regrets, other than the fact why didn't you buy it sooner?Marko