• Guns Magazine
• Precision Shooting
• Wire EDM Machine
• Haas TL-1
• CNC 4 axis Mills
• Rifle Accuracy Facts
• Mazak Integrex
• Links
• FAQs

Rifle Accuracy Facts

OUR INTEGRAL SCOPE RAIL MAKES A MORE ACCURATE ACTION. (2nd and 3rd paragraph below)

A 37% INCREASE IN RECEIVER THREADS OVER A REM 700 INCREASES THREAD CONTACT BETWEEN THE BARREL AND ACTION. (4th paragraph below)

RECEIVER RACEWAYS AND BORE ARE CUT WITH A WIRE EDM PERFECTLY SQUARE WITH THE RECEIVER FACE, THREADS, AND BOLT LOCKING LUG SURFACE. THIS MACHINE IS CAPABLE OF HOLDING TOLERANCES OF .OOOO1 INCH .

OUR ACTION IS MORE RELIABLE AND ACCURATE BECAUSE OF THE DESIGN OF OUR 1 PC BOLT No weak silver soder holding your handle on. Our repeater has .007 clearance when the bolt is on its way to battery and the last 3/4-inch this clearance is reduced to .004 clearance (.002 per side)
Our single shot has .007 clearance when the bolt is on its way to battery and .002 (.001 per side) clearance when the bolt is in position.

INTEGRAL SCOPE RAIL (no little screws here. 2nd paragraph below)

SIDE MOUNT BOLT STOP (will not bend, stick, break or deform the bolt engagement surface built in fence to protect against unwanted release.)

ANTI REM MOMENT RAIL IN BOLT RACEWAY (a shell or hull can’t get stuck in the left raceway creating a temporary malfunction)

You can purchase RIFLE ACCURACY FACTS from Precision Shooting (860-645-8776) or Sinclair (800-717-8211) or to confirm the following.

(1) RIFLE ACCURACY FACTS by Harold R. Vaughn

Receiver Ring Movement(recoil lug)
Recoil Effects page 46
"When the rifle is fired there is a net recoil force action on the rifle action that is equal to the force action on the base of the bullet, which is about 3,000 pounds at the peak chamber pressure of 53,000 psi. The force action on the bullet was shown in figure 2-24. This force is transmitted to the stock by the recoil lug on the bottom of the rifle action. Since there must be an equal and opposite reaction to any force, the stock exerts and equal force on the recoil lug in the opposite, or forward direction. This force results in a recoil moment being exerted on the forward receiver ring tending to drive the muzzle in an upward direction. "

(2) RIFLE ACCURACY FACTS by Harold R. Vaughn

Scope Mount Motion pg 93
The mounts on is particular rifle are Weaver Top Mounts with aluminum bases attached by two 6-48 screws. Now, there is just no way that two small screws can keep these bases rigidly fixed to the receiver under the loading conditions present on a rifle, no matter how tight you get them. This becomes very evident when one realizes that the axial load on the scope is roughly 500 to 700 pounds on a 270 sporter during firing. Well in fact the bases don't stay put, and you can prove this with a very simple test. All you have to do is tap on the front base with a small
hammer applied to a wood dowel so as to move it to the right, and repeat the operation on the rear base in a direction to move it to the left. Then you fire a shot, and repeat the operation three times for a three shot group. The whole operation is repeated again, only this time the bases are tapped in the opposite direction. If there is no effect, all six shots should be grouped together. When I ran this test, two distinct three shot groups resulted separated by .503 inches in the horizontal direction.

(3) Scope Mount Motion Page 96

The action was held in a vice and a dial gage measured the deflection of the muzzle as the hydraulic fluid was heated causing a axial force between the front and rear scope mount. From the data in table 6 you can calculate the angle with respect to the vertical to be about 23deg, which is a little less than the angle seen on the targets. The reason for the Groups being canted at than angle is that the receiver is weaker on the right side than the left as a result of the loading port. Consequently, the receiver bends in a plane canted to the right with respect to vertical. One can also see from Table 6 that a differential force of roughly 75-100 pounds is all that is required to cause the amount of linear dispersion seen in Figure 5-2. I decided that the easiest way to solve this problem was to make a steel bridge mount and silver solder it at both ends (figure 5-4) The bridge mount worked and eliminated the problem. I repeated the test in Table 6 with the bridge mount and the muzzle deflections were reduced by roughly a factor of ten, which means that the vertical dispersion caused by the scope mount differential axial load should be less than .1 in at 100 yards. The bad part about this solution is that it interferes with the loading port and is a bit of a nuisance. It also adds about 1.5 ounces of weight, but I don't know of any other solution. However, the bridge mount does add considerable stiffness to the fairly flexible receiver, and should improve accuracy in other ways besides the scope problem.

(4) Chapter 6 Barrel-Receiver Threaded Joint Motion pg 112

What all this comes down to is that the joint with an axial preload of 20,000 pounds has marginal stability under ordinary conditions, and is unstable when hot after firing two or three 5-shot groups without cooling. This roughly corresponds with our experience shown in Table 5, so I feel certain that this is a real effect. What is needed is an axial preload in excess of 24,000 pounds to assure that the joint cannot move under these extreme conditions of heating, shock, and vibration.