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300 WSM group jumping from spot to spot

Travis Hallam
Thanks for the replies on the last post I made about can a 150 grain be too light for good accuracy out of a 30 cal. The other question I have is why would my group keep jumping when I was breaking in the barrel and sighting it in at the same time. I would shoot a 4 shot group that would hold about a 1.5 to 2" group at 100 yards. The next group I would shoot would move a few inches in another direction and then hold there. This kept happening and I was wondering is it caused by the cleaning taking away the fouling round? Was it just me not being familiar with the rifle? I never had this problem before but it was the first time I shot this rifle and the first time I had even shot a rifle for about 10 months. I normally shoot less then a 1" group (off of a rest) with a Sako and the worse I can remember shooting was a 2.5" group at 200 yards. My optics are always high end except for recently I have gone down to Burris Black Diamonds for the S&B's and Swarovski (euro model not the AV). The scope rings and mounts were optilock and when I quit cleaning (after 30 shots) it it seemed to hold the group very well.

Thanks again for any ideas.
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Comments

7 comments

Date Votes
  • perry shooter
    Sounds like either BAD scope or RINGS/MOUNT
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  • Guns & Glass
    In addition other causal effects are:
    > Ammo OAL.
    > Barrel & stock fit. Try it cold & hot.
    > Action fit
    > Action tightness or torque*.
    > Scope adjustment.
    > Face/eye position on stock. Least likely w/scenerio but possible.

    *Torquing stocks to a value w/o pillars or blocks doesn't always work.
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  • DEG305
    I had the exact same problem with a .223. after all the areas that could have an effect on group jumping were checked II found that it was the NEW Simmons scope. Got my money back and to this day you couldn't give me a Simmons scope.
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  • RCrosby
    If none of the above prove out, you might want to take a close look at your bench technique. If you're settling into the bags, firing a group and then getting up to change targets, etc. you may not be returning to the same position? You also might have someone else try a few groups to see if they get the same results that you're getting.
    Good luck.
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  • leeblackman
    Same experience here with more than one cheap scope.
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  • tsr1965
    Those Optilock ring/mounts are two piece, where the base has to be screwed to the ring.

    Make sure that they are loctited in to the base and torqued to about 20 inch pounds before putting the ring mount on the rifle.

    Make sure your recoil stop pin is all the way rearward in the hole then torque down the base to the rifle, and some blue loctite would not hurt.

    Make sure your ring caps are tight and DO NOT apply any loctite there.

    If that fails, try another scope that you know is good.

    If that still does not cure the problem, send the rifle back to Beretta USA...the importers.

    Best
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  • Travis Hallam
    Thanks for the suggestions on the scope rings but I sold the rifle combo already. I was just wondering what might have been the cause as I am looking at getting another in the same caliber but I hate going to big of a bullet when hunting whitetail. I prefer 150 grain max. My other choice which I really like is the 270 WSM in a 130 grain bullet. I think it is the best hunting caliber for Whitetail but I sure like the hammer effect of the 300 WSM. I am just leary of making a bad shot and wasting too much meat.

    I am wondering if RCrosby might be right. I would clean after every 4 shots then go to the 100 yard marker to check the group. The next time I would shoot the group would hold about the same size but in a different location. I was guessing the fouling round was establishing the point of exit and every shot after was following the initial shot. The problem was I never shot the gun enough to see if this would hold tight with a dirty barrel.
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