Can’t come up with an answer, need help

PMCfighter

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May 15, 2019
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I received a new build by Jim Hart. I have a couple of his rifles all set up exactly the same with different barrel lengths. Including 22”, 24” and two 26” rifles.

The one I’m having issues with is a 26” 1/10 bull, mag fed Rem 700 SA .308, with Timney trigger, H&S fully adjustable chassis with Atlas.

The issue I’m having is the gun JUMPS hard right. I am Right hand/Right eye. I have done everything I can think of to figure out what the problem is.

Subs, Super, can, no can , probe direct behind the rifle, canted / angled, seated, off hand, 168s, 184s, 196s. It absolutely doesn’t matter what I’m doing the gun takes huge jumps.

I thought it might be bad habits. So I buckled down hard really concentrated on fundamentals. Did everything step by step. Cleaned every 3 rounds. I allowed three random shooters to see if it was me and all three had the same issue.

I don’t have any issue with the other Hart guns just this one.

Sooo any ideas?
 

sharpshot50

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Can you quantify what you are calling ‘huge jumps’? Are these jumps consistent in any way, e.g. always the third shot after a cleaning, etc.?
 

rth1800

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Longer barrel is going to have longer recoil impulse. Exacerbated by use of high power optic sight.
 

demolitionman

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Are you shooting off of a different surface than usual? Like concrete? Or a smooth bench? Maybe try laying prone on grass and see what happens....
 

Erno86

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Between cleanings...my accuracy in my benchrest 223 rifle drops off at the 17th round mark.

May I suggest that you shoot at least 1 fouler shot after a cleaning before grouping & unless your breaking the barrel in...I would tend to think that cleaning after every third shot is a bit of an overkill for a smokeless rifle.

How heavy is the rifle?

Unless heavy enough...a 308 round will make the rifle jump around from recoil.
 
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PMCfighter

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May 15, 2019
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Quantifying “huge jumps” the rifle is jumping 4-6” right with every shot.

No not on any new surface.
Shooting prone on the earth, seated and off hand

I have two of the exact same rifles and I am only having issues with this one. They are definitely heavy enough.
Further more the use of sub ammo should isn’t making a difference in the least.
 

AIAW

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Quantifying “huge jumps” the rifle is jumping 4-6” right with every shot.

No not on any new surface.
Shooting prone on the earth, seated and off hand

I have two of the exact same rifles and I am only having issues with this one. They are definitely heavy enough.
Further more the use of sub ammo should isn’t making a difference in the least.
The wording is confusing. You mean POI versus POA. or are you talking physical recoil "jumping"?

Checked Rail? Optic? Action tight in chassis?

Are you impacts keyholing?
 

Long Range 338

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2 things to check if you haven't already are body position (making sure you are behind the rifle and the recoil impulse is straight backwards) and the other is the shape of the stock. If the stock has much drop in the comb it can lift the front of the rifle during recoil. For us to troubleshoot your issue, you will probably have to post a video showing rifle position, body position, and recoil impulse to narrow this down. You can also review some of Lowlights videos for the online training section.
 

BOLTRIPPER

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The one I’m having issues with is a 26” 1/10 bull, mag fed Rem 700 SA .308, with Timney trigger,

that there is your problem...you got a bull barrel ........get a "cow" barrel
 
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vh20

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Almost sounds like something isn't concentric (bent barrel, bore misaligned, etc). Crazy idea, but worth a look I guess.
 

Dthomas3523

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Between cleanings...my accuracy in my benchrest 223 rifle drops off at the 17th round mark.

May I suggest that you shoot at least 1 fouler shot after a cleaning before grouping & unless your breaking the barrel in...I would tend to think that cleaning after every third shot is a bit of an overkill for a smokeless rifle.

How heavy is the rifle?

Unless heavy enough...a 308 round will make the rifle jump around from recoil.
Properly driven .308 will not “jump,” regardless of weight.

If it does, it’s you, not the rifle.
 

Downtown

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I'm really curious as to the answer. I don't think some of our suggestions are relevant, as he has two identical rifles and only one jumps. So not him and not things like stock fit. A really good question.
 

SPAK

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Some questions:

Are you using a muzzle brake?

If you are I’d swap out the brake with one of the same caliber from another rifle that doesn’t exhibit the”jump” you’re seeing. See if that makes a difference.

Running suppressed?

You said subs do the same thing? I have a hard time believing that subs generate enough recoil to move the entire rifle 4-6”. Now if you’re saying that your reticle moves 4-6” on the target that’s different.

What caliber are the other rifles you have that do not exhibit the jump you’re seeing?