g n brezinski
Member
I saw in warran pages book about a strong back scope mount by dewey of new York.i do not want to go the expence of a slelve on a 40 x action.
any thoughts on this?
gary b
any thoughts on this?
gary b
action stiffnes ways
- Thread starter g n brezinski
- Start date
Dusty Stevens
Hollow Point Dispenser
As much meat is removed on a port a welded on steel scope base stiffening the action is purely a guess. One bolted on with 8-40 screws doesnt do anything but add a few oz over an aluminum one
Boyd Allen
Active member
I have a bench gun that is built on an old 722 Remington (early short action) that is glued into a prototype EDGE stock, that has trigger pin holes in the stock. It has shot groups in the high ones. I do not think that it has a stiffness problem. The stock is made with carbon fiber. If I wanted to stiffen it, I would bond a steel one piece scope rail to it, after removing the bluing, and the finish on the underside of the base, in the areas where the adhesive would be, and roughening the surfaces. I think that if this was done properly, so as not to stress the assembly, there would be an improvement in stiffness. What do you think? One more thing, I would also do a lot of research on exotic ultra strong adhesives.
Dusty Stevens
Hollow Point Dispenser
Does the action behind the lugs really matter besides hanging a trigger? Sure you may can have a tighter bolt to raceway fit but does the banana shape of an action really matter? Jim farley struggles with this alot which is why his actions are cast but jim borden goes the other way embracing the banana shape with his borden bumps. What does a stiffer action really accomplish? Maybe the br action mfr could really make some headway on this if they studied a solution. One way was cutting the same size ports on both sides and some cut raceways in different ways like edm and broaching after ports were cut. Who knows
M
mks
Guest
Symmetry of action stiffness affects the direction that the barrel moves under recoil. If the action is perfectly symmetric side-to-side, then the barrel tends to vibrate only in the vertical plane. If not, the recoil force causes more deflection on the weak side, causing the barrel to rotate toward the weak side. Harold Vaughn has a section in his book on this.
It is useful to think about the relative stiffness of the action compared to the breech end of the barrel. The barrel is 1.25" OD and about 0.48" ID for a 30BR chamber. The action is 1.35" OD and 1" ID give or take a bit for lug races, etc. Comparing the moment of inertia of these sections, the action is not much stiffer than the barrel, which would be the ideal way to design the system. Then we cut a big loading port in one side and make the stiffness asymmetric. It is amazing rifles with such asymmetric actions shoot as well as they do. A possible explanation is that the bullet is launched in the same direction so long as the rifle responds exactly the same, and if the bullet exit time is the same. But given that bullet exit time varies, there is a benefit in having symmetric action stiffness. The effect may often be lost in the wash of other sources of dispersion, but in the effort to build increasingly accurate rifles, it is something to address.
Keith
It is useful to think about the relative stiffness of the action compared to the breech end of the barrel. The barrel is 1.25" OD and about 0.48" ID for a 30BR chamber. The action is 1.35" OD and 1" ID give or take a bit for lug races, etc. Comparing the moment of inertia of these sections, the action is not much stiffer than the barrel, which would be the ideal way to design the system. Then we cut a big loading port in one side and make the stiffness asymmetric. It is amazing rifles with such asymmetric actions shoot as well as they do. A possible explanation is that the bullet is launched in the same direction so long as the rifle responds exactly the same, and if the bullet exit time is the same. But given that bullet exit time varies, there is a benefit in having symmetric action stiffness. The effect may often be lost in the wash of other sources of dispersion, but in the effort to build increasingly accurate rifles, it is something to address.
Keith
g n brezinski
Member
action stiffnes
sir, I am leaning toward a hall action rifle that is used if I can come up with the money.if not a 40 lv in them ppc is my only solution in this time frame.the 40x action is glued in a fiberglass stock.again this rifle will spend 90% of its time hunting chucks.
gary.
sir, I am leaning toward a hall action rifle that is used if I can come up with the money.if not a 40 lv in them ppc is my only solution in this time frame.the 40x action is glued in a fiberglass stock.again this rifle will spend 90% of its time hunting chucks.
gary.