The gun jumps ... to the Left?

bigHUN

bigHUN

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A new to me 308 project target rifle, got it recently from an elder fella and modded (mostly the stock) for BR shooting in my mind.
Yesterday first time at the 100 M range just to put it on the paper and zero the scope. Sunday planning to "certify" it for longer 200-300 M distances.

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I was expecting some bounce around but its doing this to the Left consistently and out of paper at this distance.
It wouldn't bother me much if I would be shooting a single shots into multiple rings, but I need to punch 10 shot groups for 100-200-300 distances each. That is a lot of re-adjustments.

What this could mean? and how would you manage?
I assume the gun forend is not heavy enough, also the tripod, but why to L?
 
How much does it weigh ? And are you able to either have someone else shoot it or allow it to free recoil ? Or try a different front rest?

Also could that front rest be twisting at all ? Having the arm on the right side (or so it seems) that would leave me to believe it has more resistance right then left and thus twists to the left easier.

Cheers,
B
 
I like (so far) the idea of using a gimbal, I can level the bubble and the head turns/swivels keeping the bubble for the base...also I can adjust the height (because no two benches the same height in line of POA). This or similar setup I was using for long for my .25 cal BR airguns (FX Impact).

I don't clamp "hard" the arca rail only to keep the L-R inline, with a fingertip I can slide easy forward/rearward like on sled or rail, the linear recoil is "free floating".

Yes, the stock ergonomic can also be a tricky issue... this stock is not L-R symmetrical, the so called cheek weld is going around the head for max clearance.

The mechanical front + rear rest gives me to put the scope on POA and I can completely remove my head, only contact is the rear buttstock and the trigger control. And here I must say I hate this single stage trigger, it is harder to pull to my liking.

I never weighted the gun, it is heavy... heavy 1" tapered barrel.

Just got back from my garage / hobby shop. My first idea is to re-purpose some parts I have laying around in my drawers.
Expecting raining all day , maybe tomorrow I can go testing how that can work adding extra weight to the stock...

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Well it isn't an airgun so if you are shooting like you do those you will have to change your technique.
It's a whole different kettle of fish comparing recoil of .308 to a PCP rifle and you'll need to learn recoil management.
As has been stated your one sided rest is probably the cause. Try some sand bags.
 
Yes, next time out I will try sandbags, but I am expecting a lot of resetting the bubble with those. A piece of 2x6 front rest is also in the making at least to keep the vertical on the reticle.

btw, yes I know that airguns not comparable to pb but no need to underestimate, shooting those can be fun too ....

For now repurposing parts that I have in my drawers, if that not working out well I will jump on internet shopping.
 
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Igt looks to me like the front rest is attached to the rifle with an arm that comes off the right side of the forearm and down, then over to the base. This will certainly make the gun impact left when shot .
Everything needs to be in a straight line when it cones to supports
Cat
 
Thank you all
That is very likely that I butchered the synthetic stock :) I just didn't like how it was modelled/painted earlier...
The POI is not effected but my issue is with re-centering after each shot.
Tomorrow afternoon picking up a heavy machined front rest from a friend, also he have couple heavy bipods I will try to retrofit to arca. I have a earlier version Phoenix bipod but again that is not suitable for bench.
I will test all of these over the weekend.
 
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I cannot recall I ever weighted the gun before, so I just pulled out my luggage/travel scale.
This Rem 700 based 308 + the scope is 6.8 Kg. I can mount two lead blocks to the arca for extra 1.6 Kg (total) and that will bring it to 8.4 Kg for Sunday groups testing.
Posted a question to my local slug bullet casters if anybody can melt me some more weights to bring it close to Open limits ...
 
Next time you're on that bench, drag the rifle to the back and set the stool so that you're squared up behind the rifle rather than to the side as shown in your first photo. Square your shoulders, pull the rifle back into your shoulder and see how that goes. If body position doesn't improve things, I would point at the rest and how it's used.
 
358Rooster said:
Next time you're on that bench...
Click to expand...
I understand what you pointing out and I agree completely. I am doing that with my air rifle where the scope is mounted more towards rear and I can sit behind the gun and look through, without the eye box just a center only I can see the ring ...
I will try with this 308 as well, but most of these benches are old some of them layered 2-3 times, I can squeze the top plate with fingers. I am using a high power scope and when I let my elbow rest on table top I see the POA moves like half foot :)
 
Sounds like you may be sitting on a chair shooting from a bench. If this is the case, try standing up behind the bench
and bending over to get square behind your rifle.

Sitting can blades your body at an angle to your stock.
 
358Rooster said:
Next time you're on that bench, drag the rifle to the back and set the stool so that you're squared up behind the rifle rather than to the side as shown in your first photo. Square your shoulders, pull the rifle back into your shoulder and see how that goes. ...
Click to expand...
Yes, this tip eliminated the jump to left...with a same tripod rest....
It was a bit hard to setup the rest to the very rear edge on those awkward benchtops, but finally I got a nice half moa at 300 without much readjusting....Thanks.
 
Last weekend I started zeroing @ 100-200-300 meters and I got about half way done and a pouring rain hit down badly and that just ruined my numbers.
Today the weather was promising, not so hot what else to do, I pack my stuff and back to my gun club.

I finished my distances and zeroed my scope at 300, the five shot group size @ 300 ring is not bad about 45mm=1.75" with a flier - or that was just me :) .

I need to make this gun heavier, at 6.8 Kg feels super light.

What or how would you do with a synthetic stock? For now a f-class metal chassis would need to wait, no budget for it over summer months.
 
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The recoil makes it jump and the twist of the rifling torques the rifle on every shot as the bullet goes through the barrel.

I have no experience with your weird looking set up. I have always used sand bags, front and rear.
 
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