Author Topic: Rifle "twitch" at the bench  (Read 704 times)

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Offline Jim n Iowa

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Rifle "twitch" at the bench
« on: May 22, 2006, 03:08:11 PM »
I am not sure if this is the correct forum for this quest? I noticed at the range I had developed a slight left right flicker in looking in the scope. This was a regular twitch and was in rhythm to my pulse. I have never noticed this before, and have not determined where the rifle is picking up my pulse. The cross hairs will move to the left about 1/16" at !00 yd, so I try to get in the rhythm to shoot. Has anyone experienced this and what works? I was shooting -1" groups at times with my 223 that may have been better. I am shooting right handed, resting the fore end slightly ahead of the barrel screw in to the action, butt against my shoulder.
Jim

Offline victorcharlie

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Rifle "twitch" at the bench
« Reply #1 on: May 22, 2006, 03:35:18 PM »
My guess is your using a scope with the power set above 10 or so......try using a lower power......
"Extremism in the defense of liberty is no vice. Tolerance in the face of tyranny is no virtue."
Barry Goldwater

Offline Jim n Iowa

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Rifle "twitch" at the bench
« Reply #2 on: May 22, 2006, 05:33:27 PM »
You are right, I first noticed it on a high power scope, but also noticed it on my 2x7, not as pronounced however. So its not that uncommon? How do bench rest shooters compensate with 8x32 scopes?
Jim

Offline victorcharlie

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Rifle "twitch" at the bench
« Reply #3 on: May 23, 2006, 02:29:20 AM »
I really don't know......I bought a Bushnell 4200 4 X 16 and this is the highest power scope I've ever owned.  I have the same problem when the power is turned up over about 10 or 12.

Really, for big game hunting......a lower powered scope with a large field of view that collects loads of light is more to my liking.

I've been converting back to fixed 4X as they are cheaper, usually of better quality, more reliable because of less moving parts, and I can't tell any difference in group sizes at 200 yards or less.

Varmit hunting might require a little more power but for me I really don't need anything over a 10X.....The weaver K-10 fixed power would be my choice for a varmit only rig......but a K-6 has so much more field of view.....

I really think the same marketing hype that convinces us we need the latest superdupergollywhomper magnum is at work on scopes as well.  

The fixed 4X was the standard for many years.
"Extremism in the defense of liberty is no vice. Tolerance in the face of tyranny is no virtue."
Barry Goldwater

Offline huntswithdogs

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Rifle "twitch" at the bench
« Reply #4 on: May 23, 2006, 03:28:21 AM »
Jim,

As stated prior,this happens when your scope power is turned up really high. Try not getting down so tight on the rifle. Not consuming too much caffiene(sp?) before shooting also also helps.

If you wonder how benchrest shooters deal with this watch some shoot sometime. Most of our guys ,who are serious shooters,never really touch the rifle when shooting. They only touch the trigger. Their faces are not scrunched down on the stocks and there's no death grip on the forearm.

Turn the power down just a tad and relax. Control your breathing. It'll settle down.


HWD

Offline beemanbeme

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Rifle "twitch" at the bench
« Reply #5 on: May 23, 2006, 01:12:47 PM »
Using a lower powered scope doesn't make the twitch go away, you just can't see it.  If you are using a target powered rifle, 22-250 or less, then mount the rifle very gently.  Barely touching it.  If a heavy recoiling rifle, then draw the rifle into your shoulder firmly and try to over-ride the twitch.  If all else fails, try to "time" your trigger pull for the same spot in the twitch.  The really well discliplined bench shooters time their trigger pull between their heart beats.

Offline conrad101st

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Rifle "twitch" at the bench
« Reply #6 on: May 24, 2006, 05:11:01 AM »
I got the same thing whenever I fired matches with my garand.  My right eye and upper cheek would start twitching after about shot 50.  I know in my mind that I have to stay focused and not yank the trigger, but the longer the shot took to go off, the worse the twitch would get.

It seems like it's a repetitive overload response.  I try to limit my shooting with high recoil shooting to 20 shots or less.  Seems like that's about all my little BB brain can handle if I'm trying to obsess about getting the trigger to go off as a suprise under a consistent steady pull.  Trying to avoid what archers call target punching.  The other thing that my shooting coach told me was to focus on something very close like a pebble or a blade of grass between shots to keep your eyes from straining.

I shoot a 300 mag in a 7lbs rifle and can squeeze the shot off clean as a whistle while being totally focused if I limit the rounds.  On my heavy-barrel varmit rig, I can maintain the zone pretty much indefinitely.

Good luck.

Conrad

Offline jro45

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Rifle "twitch" at the bench
« Reply #7 on: May 26, 2006, 08:26:02 AM »
When I shoot to 600 yds and use a 4X16 power scope on my 300 RUM I've never noticed my heart beat movement. I guess I not holding it right to see it. :D

Offline EVOC ONE

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Rifle "twitch" at the bench
« Reply #8 on: May 26, 2006, 09:13:51 AM »
I endorse what Beemanbeme says, and would like to add to it, regarding what I've come to know as "wobble zone".  

I first learned of this while being taught how to shoot handguns off-hand.  I learned that there are very few, if any people who can hold a handgun perfectly still.  Therefore, we learn to adapt and work with a wobble.  We can reduce wobble by adjusting grip and controlling our breathing.  The shooter should watch how the handgun moves across the point of aim on the target and "plan" the shots accordingly by using smooth trigger pull techniques so that the shot goes off as the handgun returns to the aim point.  

I employ similar techniques with the rifle.  As Beemanbeme says, with lighter recoiling rifles we should only touch the weapon as much as necessary.  With heavier recoiling rifles we need a much firmer grip.  When I get down on the rifle and finally set my position I take a couple breaths and watch how much the crosshairs move off the point of aim.  After I've identified this movement, I time my shot so that as I'm coming back to zero, I've already begun my trigger pull and fire as the crosshairs return to the point of aim.  There are other factors involved as well such as how much grip is employed and trigger squeeze.

For those who have the opportunity to hunt varmints, this is a good way to employ these techiques in the field.  I use ground hog hunting as practice.  There usually is no hurry to take the shot with ground hogs, so the opportunity is there to practice.

Thanks.

EVOC ONE

Offline grousehunter

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twitch
« Reply #9 on: May 26, 2006, 03:57:54 PM »
try lighter loads! if that do'nt work, then make a DR. appt. and have your blood pressure checked! you never know what may cause the problem!!!!!!!

Offline anweis

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Re: Rifle "twitch" at the bench
« Reply #10 on: May 27, 2006, 12:13:00 PM »
Jim,
Do check your blood pressure and cholesterol levels. Crank the scope at lower power. Go shooting in nice weather (not too cold or too hot) when you are well rested and calm, and don't drink too much espresso.
That's what i do. Sometimes i get twiches or just plain fast and hard heartbeats, and i just call it quits for the day.

Offline grousehunter

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twitch
« Reply #11 on: May 27, 2006, 02:51:05 PM »
adding to anweir, I used to shoot indoor comp. archery! and also sold auto's, you know the drag! coffee pot is always on and you just keep going back for more! well I figured out that the last cup was approx. 4:30 in the afternoon, if I wanted to shoot decent that night at 9PM!