Bad Grouping - Need Help

Discussion in 'General Rifle Discussion' started by deerslayer--01, Oct 29, 2012.

  1. deerslayer--01

    deerslayer--01 New Member

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    So I went out Saturday and fired my new RRA .458 SOCOM for the first time.

    CorBon Hunter 300 grain jacketed hollow points.

    Using Harris Bipod and shooting from a table and sitting in a chair.

    I am using a 4-16 x 44 mm scope.

    Every shot, I felt confident and squeezed the trigger. I had a very stable shooting base.

    Started a 25 yards and shot 4" due right of bullseye. I made adjustments.
    Next shot 3" right. Made adjustments.
    Next shot 1" right Made adjustments.
    Next two shots - holes were touching in the bullseye.

    Moved to 75 yards.
    First shot - missed the target
    Next shot - 11:00 oclock edge of the paper - 4" from bullseye.

    Moved back to 50 yards
    Made adjustments - See attachment.

    Shots 1 - 4 were within 2" of each other.
    Shot 5 was was 3.5 " high.

    Because thesse rounds are soooo expensive, I didn't want to even try a 100 yard shot. Although I can zoom in and see the bullseye just fine at that yardage.

    Should I expect better grouping from this rifle. I mean I get better grouping from my Remington 870 with a red dot scope at 100 yards shooting solid copper sabots out of my rifled barrel.

    Thanks!
     

    Attached Files:

  2. mountainman13

    mountainman13 New Member

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    If you sight it in at 25 yards it should be zeroed for 300 yards. Assuming the caliber doesn't change the typical AR setup.
     

  3. gunnut07

    gunnut07 New Member

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    First things first.

    1. Check the scope mount and rings to make sure everything is tight and torqued down.
    2. Clean inspect and lube the rifle.
    3. Check yourself by using a different gun say a 22 lr. Make sure you are not slapping the trigger.

    As for the sighted in at 25 is on at 300. Yeah ok. This is a 458 socom for one. Take a look at corbons exterior balistics. http://www.shopcorbon.com/Self-Defe...RBON-Self-Defense-JHP/SD458300-20/100/Product
     
  4. JTJ

    JTJ Well-Known Member Supporter

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    What brand is the scope?
     
  5. deerslayer--01

    deerslayer--01 New Member

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    After the first shot, I did torque down the mount screws.
    I do need to clean and lube the rifle prior to shooting again...
    I know for a fact that I am not slapping the trigger. No fear in recoil... It kicks less than my .50 cal muzzle loader. Just breath hold and sqeeze. Just like in 1985 at Camp Pendleton where I scored a 243.

    As for the scope... I bought this scope in 86 and put it on my Savage 30-06. Worked great. Sold the rifle and kept the scope. I installed it on my Remmington 700 .50 cal muzzle loader a few years back. No problems there. I wanted to give you this info prior to telling you the brand name on it. It is a Tasco TR 4-16x44mm with interchangeable rings. I know...Tasco = cheap. However, this was not a cheap scope, even in 1986. $175.00 then. And it did great on my other rifles.

    I've thought the same thing though. I've even thought of putting my red dot on this rifle.
     
  6. Triumphman

    Triumphman Active Member

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    You're shooting a "Semiauto" compared to the other 2 rifles. A semiauto acts like a "springer" airgun. It recoils in both directions, so that scope which worked great on the other 2 rifles, is probably not working well with the Socom. If you can get your hands on a good "fixed" 4 power scope--try that to see if your group tightens up. Also DON'T run round after round down that barrel. What's also happening is your heating up and barrel might not be holding POI. Try a shot out of cold barrel, then wait 15min and shoot another round. Adjust scope if need be. If good, shorten up the time span, and run at 10min, if still good, shorten up to 5 minutes. You'll find somewhere in there, where you CAN/CAN'T shoot round after round. I've had to do this on many of my rifles to find that balance of shooting rounds until rifle broke in.
    This being a NEW Rifle, you also need to break in, and this also will give better results. Don't be afraid to try different ammo also, as gun will tell you what it likes, as I'm sure you know this, but sometimes trying different ammo brands is easier said than done, especially with $60 ammo.
    Hope this is your new Deer/Hog gun?
    Del
     
  7. deerslayer--01

    deerslayer--01 New Member

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    Thank You! Much good info here... I will do all of this, short of the ammo part. Very little to choose from. Although I did wonder how the hollow points would fly compared to a ballistic tip round. Seems like the B Tip round would fly more true.
     
  8. Triumphman

    Triumphman Active Member

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    I don't know about whether a HP, or B-Tip would work better. More than anything between a B-tip and HP, would be their penetration/expansion factors that a Ammo Manufacturer designs into them that they think the Public uses that ammo for, or the powder charge behind that bullet. Some guns just like one ammo type or bullet grain weight better over another, even if ammo from same Manufacturer.
    Del
     
  9. locutus

    locutus Well-Known Member Supporter

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    Most scopes designed for high power rifles have parrallex set at 100 or 200 yards. That's also way too much power foir the cartridge.

    Get a straight 2x or 4x and send it back to the maker to have the parrallex reset to 75 yards.
     
  10. deerslayer--01

    deerslayer--01 New Member

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    I was just thinking of the aerodynamics of the B Tip vs the HP. The HP giving the round an opening at the end of it to grab wind and air vs the enclosed B Tip.
     
  11. gunnut07

    gunnut07 New Member

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    hallow point bullet reduce the friction as the build a cushion of air in front of the bullet thus allowing the air to be moved by other air.
     
  12. JTJ

    JTJ Well-Known Member Supporter

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  13. Txhillbilly

    Txhillbilly Active Member

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    I shoot my 458 SOCOM quit a bit,and it's topped with a Weaver Super Slam 3-15x50.While the upper magnification serves very few hunting purposes,it comes in real handy when I'm do load development testing,and works great when I'm shooting out to 250 yards with this weapon.

    Deerslayer,First off I don't know many shooters of the 458 SC that care for any of the Corbon ammo.Most of the time it's pushing the upper limits,and shows pressure signs on the brass when fired,which is bad for the weapon's bolt/extractor/ejector/buffer system.
    I have only fired handloads out of mine,so I have no personal experience with factory ammo.

    What type of magazine are you using?
    I use standard style G.I. 20rd magazines with mine.When I first started shooting it,I noticed that the last round in the magazine would shoot way off from the previous rounds.
    Finally the gun jammed,and I found out why.The bolt was shoving the last round downward at the nose of the bullet,and it was hitting the front edge of the magazine and ripping a big chunk off the nose of the bullet.
    I solved the problem by cutting/grinding a half-moon at the top/front of the magazines.

    [​IMG]

    While the pics don't look too good,once I found out this solved the problem,I cleaned up the rough looking modification to the mags.
    My next experiment is to put epoxy on the follower,on the lower side,and them file a center channel into the follower.I feel the follower still cants the last round while it's being pushed by the bolt into the chamber.

    I have used P Mags several times,but they need to be modified more to work like the G.I.magazines.

    I shoot several types and weights of bullets out of mine from 300gr-405gr,and the accuracy stays between .750"-1.5" 3 shot groups at 100 yards with every powder/bullet combination that I've tried.
    I usually only shoot 3 shot groups with the 458 SC when I'm developing loads,just to keep from wasting money.If a load won't shoot 3 bullets good,why waste 2 more.

    Here's a target when I noticed something was going wrong. 2.514" at 100 yrds.

    [​IMG]

    Here's a target after the magazine mod. .785" at 100 yrds

    [​IMG]

    I'd really suggest learning to reload for this caliber.It's a lot cheaper than factory ammo,and the results are a whole lot better.Plus,there are so many different bullets to choose from,and you can really make these things shoot good with a little effort.
    I've found that it doesn't really matter what type of bullet you shoot out of this caliber-JHP,FN,FNLP,RNLP,or BT they will all shoot great with the correct powder type/weight combo.
     
  14. Triumphman

    Triumphman Active Member

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    Damn, you certainly found the sweet spot that 458 likes.
    Del
     
  15. Eturnsdale

    Eturnsdale New Member

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    Yup. The whole 25 and 300 thing is only accurate for 62 gr 5.56. And you can change the PBR by simply zeroing at different distances.

    Point blank range will differ completely depending on caliber, and even then bullet weight construction and sights.

    As for the OP. IDK, shoot better?