How do you deal with torque from firing?

[BK7saum]

I'm still trying to get the bugs worked out of my 7 ammo SAUM. Off of the bipod I don't notice the rifle torque too much. Off of bags the rifle torque is very noticeable. I pull the rifle snugly into my shoulder and use my off hand to control the rear bag. Question is how do most of you control or deal with the rifle torquing during firing. I know I'm not going to stop it. The rifle shoots fairly well. But I am seeing vertical string at times. I know its me. I just havent had much time to dry fire or get out to the range lately.

Thanks to all. Any advice or suggestions. Btw. Not a noob to shooting. Have some experience but am always willing to learn something new.

Rifle is tac 300 action with 26" krieger 5.5 fluted barrel bedded into a b&c medalist stock. Jewell trigger . Shooting 180 jlks at 2900 or so. Rifle is probably in the 10-11 pound range.

 

[Greg Langelius *]

Re: How do you deal with torque from firing?

The way to deal with torque, or any of the other products of the bullet's transit down the bore, is actually by remembering that the key to repeatable accuracy is consistency.

It's a matter of how we hold onto the rifle. Grip pressure, shoulder pressure, cheek pressure, and any other aspects of the hold need to kept as consistent as we can get them. Forget about perfection; concentrate on 'better'.

Similarly important is that these factors work best when they can be accomplished in the most relaxed manner possible. If the muscles are working, then the muscles are inevitibly becoming fatigued as well. Nobody can shoot well once fatigue sets in, and when it does, it begins with the first shot and goes downhill from there.

I can't tell you how to do this in your own best way, but these goals will help you find your own best way.

FWIW, vertical stringing is usually interpreted by instructors as being a product of breathing.

Breathing should incorporate the NRP or Natural Respiratory Pause. We relax in our position with the sights aligned on the target. We then exhale naturally, and allow the breathing cycle to find its own most natural end of the exhalation. This is the point where we complete the trigger squeeze, until then we're waiting with the slack taken up.

Do not 'hold your breath'. Taking in air and holding it requires effort, and accentuates the pulse. It is exactly the wrong way to be breathing when trying to achieve accuracy

Greg

 

[SIE107]

Re: How do you deal with torque from firing?

Dont' tense your shoulders and let it roll back into your shoulder. You must do this everytime.. try it sometime with a tubestock.. it ain't easy getting groups for load testing.

 

[seanh]

Re: How do you deal with torque from firing?

I'm assuming your shooting off a bench. If that is the case I'd look at how you're mounting the rifle.

Yesterday I ran into an issue with my groups and it had to do with the way I was sitting on the bench. This had the effect of screwing with my mount.

Our benches are "T" shaped, for lack of a better description and I had the rifle basically centered on the T. This caused me to mount the rifle without being properly inline with the gun. Soon as I changed my mount, recoil was tamed and my shots became a little more consistent...still sucked though.

I sat facing, paralleling the target and put the gun directly in front of me. This allowed me to have more control of the recoil

 

[BK7saum]

Re: How do you deal with torque from firing?

Thanks to all so far. I am an le firearms instructor. I have a grasp of the fundamentals but there is always something to learn from other shooters.
I try to be consistent shot to shot but the torque from the heavy 7 millimeter bullets is a new 1 for me.
All shots were fired from the prone position. I shot some prone with a bipodand didn't really notice it or just some bipod hop. When I remove the bipod and went to sandbags I noticed the torque was fairly significant.
Blk7

 

[bowslngr]

Re: How do you deal with torque from firing?

Don't know why it is, but I think you will find that as you continue to break that barrel in it will torque less and less on you. That has been my impression on three new barrels that I have broke in and started with a heavy torque.

 

[seanh]

Re: How do you deal with torque from firing?

it's understandable that you won't notice the bipod torque as much due to the wider bipod footprint.

 

[DAVETOOLEY]

Re: How do you deal with torque from firing?

The technical term is moment of inertia. More weight further from the center line of the rifle resists rotational forces.

http://en.wikipedia.org/wiki/Moment_of_inertia

Overview
The moment of inertia of an object about a given axis describes how difficult it is to change its angular motion about that axis. Therefore, it encompasses not just how much mass the object has overall, but how far each bit of mass is from the axis. The farther out the object's mass is, the more rotational inertia the object has, and the more force is required to change its rotation rate. For example, consider two hoops, A and B, made of the same material and of equal mass. Hoop A is larger in diameter but thinner than B. It requires more effort to accelerate hoop A (change its angular velocity) because its mass is distributed farther from its axis of rotation: mass that is farther out from that axis must, for a given angular velocity, move more quickly than mass closer in. So in this case, hoop A has a larger moment of inertia than hoop B.


Divers reducing their moments of inertia to increase their rates of rotationThe moment of inertia of an object can change if its shape changes. Figure skaters who begin a spin with arms outstretched provide a striking example. By pulling in their arms, they reduce their moment of inertia, causing them to spin faster (by the conservation of angular momentum).

The moment of inertia has two forms, a scalar form, I, (used when the axis of rotation is specified) and a more general tensor form that does not require the axis of rotation to be specified. The scalar moment of inertia, I, (often called simply the "moment of inertia") allows a succinct analysis of many simple problems in rotational dynamics, such as objects rolling down inclines and the behavior of pulleys. For instance, while a block of any shape will slide down a frictionless decline at the same rate, rolling objects may descend at different rates, depending on their moments of inertia. A hoop will descend more slowly than a solid disk of equal mass and radius because more of its mass is located far from the axis of rotation. However, for (more complicated) problems in which the axis of rotation can change, the scalar treatment is inadequate, and the tensor treatment must be used (although shortcuts are possible in special situations). Examples requiring such a treatment include gyroscopes, tops, and even satellites, all objects whose alignment can change.

The moment of inertia is also called the mass moment of inertia (especially by mechanical engineers) to avoid confusion with the second moment of area, which is sometimes called the area moment of inertia (especially by structural engineers). The easiest way to differentiate these quantities is through their units (kg·m² as opposed to m4). In addition, moment of inertia should not be confused with polar moment of inertia (more specifically, polar moment of inertia of area), which is a measure of an object's ability to resist torsion (twisting) only, although, mathematically, they are similar: if the solid for which the moment of inertia is being calculated has uniform thickness in the direction of the rotating axis, and also has uniform mass density, the difference between the two types of moments of inertia is a factor of mass per unit area.