Trouble Grouping .270 Win Loads

Discussion in 'The Ammo & Reloading Forum' started by Chebyshev, Oct 3, 2011.

  1. Chebyshev

    Chebyshev New Member

    Oct 3, 2011
    I went to sight in my Ruger M77 Mark 2 this weekend in preparation for the upcoming whitetail season in the east. I had horrible problems getting groups from the new rounds I loaded this year and was hoping to get some recommendations from more experienced reloaders.

    In the past I used 130 grain Speer Grand Slams with 56 grains of IMR7828 and was able to shoot 1" groups at 100yds without much problem.

    This year I tried loading up some 130g Hornady InterLock SST to try something new. I started with 58 grains IMR7828 and was shooting horrible 8" groups. I think they were a bit hot because the primer was flattened and cratered so I backed it off to 56 grains IMR7828 and shot more like 2". I tried some with 52 grains of IMR4350 and got maybe 3" groups. I was basing these choices on the hodgdon website reloading tables and the Speer manual.

    Does anyone have experience with this caliber/bullet combo? What do you use for powder? What about seating depth? I haven't messed with that too much, I've just been seating them to about the mid point of the cannelure.
  2. howlnmad

    howlnmad Well-Known Member Supporting Member

    Nov 26, 2008
    Harriman, Tn
    Have tried adjusting your OAL with these different components?

  3. gdmoody

    gdmoody Moderator Supporting Member

    Sep 7, 2007
    Athens, Georgia
    Welcome to The Forum, Chebyshev.

    I know that you have checked that your scope is still securely fastened to your rifle. I do not have a .270 and I don not use IMR powders but from what you say, you might want to hover around the 55 to 57 grain loads and try 1/2 grain increments to see which one is best OR go back to the Grand Slam bullets.
  4. Chebyshev

    Chebyshev New Member

    Oct 3, 2011
    @howlnmad: I did load the second batch (56 grains of 7828) a bit longer because we figured maybe that was part of the problem, but I didn't do any fancy testing like is outlined here

    @gdmooody: Yes, I checked the scope mounts and the screws that hold the receiver. Everything was tight. The scope hasn't been removed/moved for probably 5 years.
    Last edited: Oct 3, 2011
  5. myfriendis410

    myfriendis410 Member

    Mar 30, 2011
    Lompoc California
    I would suggest a thorough cleaning. Use something like CR10 or Sweet's 7.62 and clean until the patches are tan or white. Ruger rifles I've handled in recent years seem to have a somewhat rough bore. I worked up a 77 Mk II in 7mm r.m. last year and this was the case. Ten shots and you'd better clean it thoroughly.

    Somebody on another forum was having trouble with their Tikka and everyone chimed in with the suggestion to clean. He did and his problem went right away.

    As to powder; I load for my hunting partner's .270, and the standard for that round really is IMR 4350. I prefer Federal 210M's over any other as a general rule. Be sure your brass is trimmed to maintain even neck tension on the bullet.
  6. woolleyworm

    woolleyworm Well-Known Member

    Feb 23, 2009
    SW Fort Worth
    With every bullet/powder change in a bolt action, I'll do a ladder test. Even though the bullets you're using are the same wt, they are probably much different in design and BC. Take the time to load/shoot 20 rounds with the ladder test and you'll get a clear picture of whats going on with your loads.

    Are you FL or neck sizing?

    Semper Fi and welcome to TFF,

  7. Chebyshev

    Chebyshev New Member

    Oct 3, 2011
    The rifle was cleaned at the end of last season and I plan on cleaning it prior to more shooting. I don't think this is an issue.

    @woolleyworm: I am FL sizing. By ladder test you mean changing the load by a 0.5 grains every 3 shots or something to see what amount of powder works the best?
  8. 312shooter

    312shooter Well-Known Member

    Mar 17, 2008
    Las Vegas NV
    First neck size the brass you fired in the rifle and start at a minimum charge. You changed your bullet/powder combination therefore your load development needs to backup to square 1. After the aforementioned cleaning try the original moa recipe and verify you don't have action, scope or barrel problem. Try another powder with the hornadys and go have fun shooting.
  9. Chebyshev

    Chebyshev New Member

    Oct 3, 2011
    From everything I've read, neck sizing the brass doesn't really make that much of a difference in production hunting rifles, it is more for precision bench shooting or varmint loads. I don't even have a neck sizing die for .270.
  10. 312shooter

    312shooter Well-Known Member

    Mar 17, 2008
    Las Vegas NV
    I disagree totally and yes you do have a neck sizing die! A neck resizing can be accomplished by backing your FL sizing die off a touch. Search around and you'll find out besides accurizing your loads, you are accomplishing much more. While maintaining a good fit in your rifle chamber you are minimizing the cases from stretching, less brass flow, less trimming and longer life of the cartrige. You have the opportunity to produce VERY accurate ammo in your inherently accurate 270, don't close the door on potential!
  11. myfriendis410

    myfriendis410 Member

    Mar 30, 2011
    Lompoc California
    Did you use an aggressive copper remover? If you used Hoppe's #9 you are not getting any of the copper out. I like and use the CR10 made by Barnes. A wet nylon brush is introduced into the rifle and passed through ten times and allowed to stand for five minutes. A dry patch is then pushed through. Repeat until no blue or green tint is present on the patches. I found out the hard way that I had a copper fouling issue and returned the rifle to it's former 1/4" groups by a thorough cleaning, which took me three hours. Really quite an amazing amount of copper came out.
  12. JLA

    JLA Well-Known Member

    Feb 26, 2007
    Heart Of Texas

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  13. 1 Eyed Jack

    1 Eyed Jack New Member

    Aug 19, 2011
    JLA, the link you provided here is a great read, I'm about half way through, oustanding info,
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