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Thread: Grouping problem 338LM

  1. #1
    Member redbang's Avatar
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    Grouping problem 338LM

    Hi folks, got me a problem and am hoping someone can come up with a fix.
    Brand new Savage 110 FCP in 338 LM, Sightron 8-32x56 shooting off a bipod and rear bag at 110yds. 285gr Hornady projectiles,H1000 working between 90-93grs, Norma brass.
    Problem:- One shot jumps out of a group of 3 shots( by about 1-1 1/2") and sometimes its 2 shots jump out of a 5 shot group, the others shots are touching or pretty close.
    I've checked all scope mounts, rail mounts, action screws and the free float is well clear. The powder loads are all exact, and round is concentric to within .001-.003.
    Any and all comments welcome, cheers, Red

  2. #2
    R93
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    If everything is sweet that you can control then my guess would be she needs some attention in the bedding department.

    Fire a couple groups again but on a cold barrel, say 5-10 mins between shots. If you get the roughly same pattern it will most likely be some action movment.
    Last edited by R93; 21-10-2012 at 10:04 PM.
    Dead is better likes this.
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  3. #3
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    Possibly bipod jump, make sure your technique is perfect, preload the bipod so that when it recoils it doesn't jump. Otherwise borrow a benchrest and do your accuracy testing there.

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    Re: Grouping problem 338LM

    Sling stud hitting rear bag?

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  5. #5
    R93
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    Quote Originally Posted by CreepingDeath View Post
    Sling stud hitting rear bag?

    Sent from my GT-I9300 using Tapatalk 2


    Whats your theory on this one sir?
    Do what ya want! Ya will anyway.

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    Re: Grouping problem 338LM

    Quote Originally Posted by R93 View Post
    Whats your theory on this one sir?
    Haha im ready to be shunned for this but aparantley the stud hitting the bag in a different way each time the rifles fired(especially heavy recoiling rifles) can alter poi. Now this isnt my theory but have two freinds that shoot f class and alot of long range who swear by this.



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  7. #7
    R93
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    I fire oodles of rounds the same way. I think it is worth looking at, not shunning as it may have a ton of merit. You see some BR shooters allow the rifle to freely recoil straight back by lying on top of the stock, not behind it.
    Do what ya want! Ya will anyway.

  8. #8
    Member Rich007's Avatar
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    There is quite a bit of stuff that has been written about making sure rifles recoil in 'exactly' the same way each time. There was a really interesting article on here a while back about some guys in the US who used to shoot amazing groups in a great big building (static environment), they talked a about the way they held the rifle each time affecting group sizes.
    If my work annoys me, I cull them

  9. #9
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    I would check to see the brake is tight & shows no sign of getting in contact with the bullet .

    It seems you have checked all screws etc , I would pull the bipod off and fire it off sandbags front & rear , and also use the free recoil style of shooting IT , BUT be aware that you may have large groups at 100 & at 500 they are much smaller moa relative , I think some times it takes the big pills a bit longer to settle down .
    In a Sako TRG-41 , I found it was not that impressive at 100m ( approx 1 moa ) , but at 500 it was sub 0.4 moa ( 2.25 inche groups ) , just some thing to think about .

    Later Chris

  10. #10
    R93
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    I may be different to most, but I only allow the butt to rest against my shoulder and apply some cheek pressure, when lying prone. I do not load the bi-pod in any way if using one. I manipulate the trigger with fore finger and thumb pressure only. I never grasp the grip with my whole hand. I have a sling on my rifle and will remove it for load testing and such. I will remove the stud nxt time I am having a play and see if there is any difference. Cheers CD it may account for the rare wtf moments I get.
    Do what ya want! Ya will anyway.

  11. #11
    Member redbang's Avatar
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    No sling stud on it, but take your point about keeping the bipod loaded the same each time. It's some thing I have to concentrate on, no doubt about that !

  12. #12
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    Its always a tough one this kind of thing,it really is.
    I would double check things like bases,rings and action screws at the correct tourqe,while your there, check there is no oil or solvents under action or mating surfaces.

    You may want to consider spikes on the bipod if you havent already,and while Im on Bipods, a little trick on the Harris's is to NIP up the thumb screw with a allen key.
    If its not tight bipod will twist on the stock potentially "steering" the rifle under recoil,one shot wont make a difference, shooting groups without noticing it it may cause some unexpected and unexplained flyiers.

    Also a slow rate of fire with the big boys helps too.

    Hope this helps

    RUNAS

  13. #13
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    I have read a few accounts of people tuning out fliers by adjusting seating depth and others that suggested that seating depth will only shrink or expand groups and not fix fliers. I don't know if it would help or not but if you have tried everything else might be worth a try..... Google seating depth and flyers and group and you will see what I mean. What happens if someone else shoots a group with your rifle? do they see the same thing?

  14. #14
    Member redbang's Avatar
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    Thats a good thought M8, I'll get someone else to do the biz and see what happens

  15. #15
    R93
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    You have 3 touching and 2 an 1" 1/2 away from the group yeah? Are the other 2 flyers close to each other RB?
    Do what ya want! Ya will anyway.

 

 

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