Bad scope?

[madmixerman]

Shown is a target shot from my new 6 br . Trued Rem. 700,28" Brux 8 twist, 2 oz Jewel,105 Amax.,45 x Leupold comp.Varget powder.Targets 2&4 29.5 gr. , 1&5 30 gr. 3 & 6 30.5 gr. Shot at 100 meters.Numbered targets represent the order in which they were shot.

 

[Bob3700]

The first two targets are what I would expect, the rest are not.

The bbl obviously shoots. Now the next question is what are the possible causes for the rest. Were you shooting off of a rest and sandbags?

What experience do you have shooting off bags? The reason I ask is that my first thought is always the shooter, not the gun.

Is your rifle a bench gun with a 3" forearm? Are you shooting with free recoil or applying pressure to the pistol grip?

There are so many variables that can cause the vertical spread of the later targets.

What is your ammo prep. procedure?

All the right parts assembled don't guarantee small groups.

If you do suspect the scope, borrow a known good glass and test again. If you get the same results, the glass is not the problem.

Probably need more info, not just the pedigree of the rifle.

RGDS

Bob

 

[madmixerman]

Targets were shot off a Sinclair rest with a #2 front bag.Stock is a HS Precision tactical stock. I do shoot some benchrest for score. This gun was made for our long range varmint shoots. May put a stock on it with a 3" flat forearm.

 

[Bob3700]

Tactical stocks or any stock with a rounded fore end are hard to shoot small groups with consistently. They want to roll left and right.

Bag technique is a big issue here. Getting the rifle to come back in recoil the same each time is the challenge. You might try of of those "Accuracy Assets" that attach a 3inch wide plate to the forward sling swivel. Powder the bags to help the rifle slide during recoil.

Another thing to look at is neck tension. The more consistent you neck tension is, the more accurate the rifle will print.

Bob

 

[savet06]

I had a loose scope rings on my score gun and it made patterns like that. It was the first 10 or so rounds down the gun and my palms were starting to sweat when i thought about the investment I had just made...then i saw that the rings had slid forward about 1/2" on the base my smith made. Tightened 'em down and they're all going where their supposed to now.

Looks like something went to heck after the second target, and I am less inclined to think that, though it may be tough to shoot real small groups (Benchrest with a capital "B" type groups ;D) with that setup, you should be able to duplicate your 1&2 targets or at least come close.

Do you have another scope to put on the rig to see if that fixes the problem? Might be worth it, and maybe do a thorough screw check on everything to make sure all is tight.
Just my two pennies worth.
Mike

 

[brxbrad]

I shoot a BRX in f-class midrange and longrange and have done a considerable amount of load development. Have you cronied your load to check consistancy in your loads? It appears your first two loads are close with possiblly a lose nut behind the triger. I would reload the 10 rounds each of the first two. Take someone you know that is a good shooter and each of you shoot the same test. Compare your results. This should tell you if your problem is shooter related or gun related. Take your best results and then tweek .2 grain. My shooting buddy has a BR and a BRX and we have found that the accuracy of all our BR's change with only .2 gain change. Below is one of the test results I done with my BRX and as you can see, this gun has a .2 grain window and shoots best at 33.4 to 33.6 with .5 inch group @ 200 yrds. Consistancy throughout is the key.......
Sierra Match King 107 gr
Avg. Velocity 2988 3006 3022 3028
Powder Charge 33.2 gr 33.4 gr 33.6 gr 33.8 gr
Group Size 1.43 0.557 0.5 1.345

 

[Klong]

The only way to tell for sure if it a scope issue is to switch scopes and see it shoots better. They do go bad! ! !

 

[tsiero]

If you have product support from the manufacturer send it back to them for evaluation. Both Leupold and Burris have been excellent in customer service.

 

[yat3b35]

I had the same problem as you're experencing . Same scope same action , different barrel. I fought the rifle all last year and this year the same thing. I removed the scope and took a good look at the bases on the action. When tightening the fron mount screws the rear of the base started to move upward,vise versa when tightening the rear screws. The base I was using was out of wack. I replaced it with a 2 piece base and solved the problem.
One other thing you may want to check out is wether or not your lock ring on your scope is tight , if not you may be getting some paralex , causeing you aim point to be changing. Also make sure you turn your scope range focus to infinity and then back to your range you are shooting. The side focus adjustment has to be set that way or you have trouble also . Just food for thought. John

 

[limbic]

Who makes a good two piece 20 base. My base on my 260 wiggles like a mad man when I put it on.

 

[deadlyswift]

I'll take a stab at this. If I completly miss some one correct me! I'm takeing that target 2&4 were shot with 29.5gr.
and 1&5 was with 30gr. If this was my target this is what I would have taken from what the barrel seems to be telling me. 3&6 I would forget about 30.5 gr. Look at target 2&4 the groups are actually simlar. Target 2 looks good. Then on target 4 it was heading in the same direction but there is 2 shots that dropped low. Now look at targets 1&5. Target 1 is looking a lot better again on target 5 it was heading in the same direction then 2 shots went low again. So with that being said it looks like a accuracy node is in between 29.5gr and 30gr. If this was my target I would blame the 2 low shots on myself. Don't get me wrong I'm not trying to say you can't shoot but I always try to figure out what I done wrong or doing worng before I blame my rifle. As to ES/SD I wouldn't even worry about that at 100meters. ES doesn't cause that much vertical, and I wouldn't worry about ES unless I was shooting at least 300yds or futher.

Coming back to targets 3&6 It might be worth testing at 300yrds. Many times a load that shoots awesome at 100 want hold tight gourps at long range, and what may shoot good at say 600 or even a 1000yrds want shoot worth a flip at 100yrds. It sounds crazy I know, but I have experienced it myself and have been told this from some really great shooters, and who I would consider experts.

I will say this if it was me I'd check my scope rings and base. Just to make sure they were tight and element that possabilty. I would pay close attention to my cheek placement and tigger pull. I would note how the gun recoiled each time. Did it kick striaght back, was there muzzle rise, did it rise to the left or right. As said before the rounded stocks do roll left to right in the bags causing your rifle to be canted. Targets 1&2 prove that the barrel will shoot so to me the next thing to check would be me the shooter. It may not fix the problem but it would be a good start.