Do belts affect accuracy?

Discussion in 'Rifles, Bullets, Barrels & Ballistics' started by trader388, Mar 11, 2004.

  1. trader388

    trader388 Well-Known Member

    Messages:
    323
    Joined:
    Feb 12, 2004
    choosing between a 300wm and 300wsm...does the belt make the 300wm less accurate?
     
  2. Chilly Willy

    Chilly Willy Well-Known Member

    Messages:
    46
    Joined:
    Jan 5, 2004
    hold your pencil at the eraser and write your name....this represents the 300 WM. Now hold the pencil close to the lead point and write your name...this represents the 300 WSM. Which delivers a more controlled result?

    WSM same for RUM

    This only pertains to bullet alignment to bore, and can effect accuracy and consistancy.
     

  3. COBrad

    COBrad Well-Known Member

    Messages:
    946
    Joined:
    Jan 4, 2004
    I've shot many, many rounds of 7mm mag and .300 Jarrett (necked down, "improved" 8mm mag cases) and found them to be very accurate. I also size them so that I am headspacing off the shoulder. I've had two 7mm hunting rifles, one bedded, one factory, that consistently shot in the .4's, with carefully worked up handloads. My 7.5 lb. .300 Jarrett shots around .5 if I do my part. They have worked for me.
     
  4. a.JR

    a.JR Well-Known Member

    Messages:
    98
    Joined:
    May 28, 2003
    Trader,The answer to your question is No..I shoot a 300winmag imp in 550 and 1000yd bench comps and it is very accurate and a lot easier to buy good quality brass for..JR..Jeff Rogers
     
  5. littletoes

    littletoes Well-Known Member

    Messages:
    362
    Joined:
    Apr 12, 2002
    You could have a smith remove a little material ahead of the belt in the chamber, then it would always space off the shoulder. End of question.
     
  6. JBM

    JBM Well-Known Member

    Messages:
    113
    Joined:
    Jan 12, 2004
    ...or just trim the bases so they are square (I use a Wilson trimmer) and then headspace off the shoulder.
     
  7. trader388

    trader388 Well-Known Member

    Messages:
    323
    Joined:
    Feb 12, 2004
    both great suggestions! thanks!!!
     
  8. Mysticplayer

    Mysticplayer Writers Guild

    Messages:
    1,459
    Joined:
    Jul 27, 2001
    Not when you do reload your own ammo. The belt plays no role in the headspacing of the ammo. Only downside of that belt is that the web infront of the belt may grow and affect chambering. Difficult to size.

    However, since the case is bigger, you may be running lower pressures so this stretching is less pronounced.

    The Win mag has been used for many years at LR matches and is very competitive. If you want to shoot a 30cal LR, then heavier bullets will help. WSM case is just a bit small unless long barrels and/or high pressures are used. That is not necessarily good for accuracy or brass life either.

    Jerry
     
  9. trader388

    trader388 Well-Known Member

    Messages:
    323
    Joined:
    Feb 12, 2004
    As far as hunting goes I dont plan to reload. But for targets I'm looking to load either LR J40s, Berger VLDs, or JLKs. Hunting I dont need pin point accuracy...but targets I'd like .5 MOA if I could. Targets going out to 1000 yards and would love to get beyond 1000...maybe 1500?

    Choice is now between the 7 WSM or 300 WM

    [ 03-12-2004: Message edited by: trader388 ]
     
  10. Brown Dog

    Brown Dog Writers Guild

    Messages:
    635
    Joined:
    Sep 26, 2003
    JBM,
    I'm sure I'm being dull, but could you explain
    "...or just trim the bases so they are square"
    Are you taking off the leading edge of the belt?

    Often wondered what would happen if one were to remove the belt entirely.
     
  11. DANTEC

    DANTEC Well-Known Member

    Messages:
    390
    Joined:
    Jul 6, 2002
    I agre with JBM and if you chamber is righ design accuracy is thes ame

    por chambering make poor accuracy with or without belt

    tips : use a 0.218 custom headspace GO gauge and set your headspace to feel the contact on 0.218 gauge that improvement accuracy , any belted case are over 0.216 on belt

    chambering set with GO/NO GO saami is POOR

    good shooting

    DAN TEC
     
  12. JBM

    JBM Well-Known Member

    Messages:
    113
    Joined:
    Jan 12, 2004
    <BLOCKQUOTE><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><HR>I'm sure I'm being dull, but could you explain
    "...or just trim the bases so they are square"
    Are you taking off the leading edge of the belt?<HR></BLOCKQUOTE>

    No, that wasn't really a good explanation.

    When I prep cases for my heavy bench rifle, I put the cases in a Wilson trimmer, backwards, so the cutter (oversize) is cuttnig the base of the case. It squares it up nicely -- you'd be surprise at how bad some are. My heavy bench gun has headspace set to .215 and I've never had any cases with trimmed bases not fit. After fireforming they headspace off the shoulder anyway.
     
  13. trader388

    trader388 Well-Known Member

    Messages:
    323
    Joined:
    Feb 12, 2004
    hmm maybe I should think twice about who I have rechamber my 300SAUM to 300WSM. Wonder if I will have problems with rem 700 and 30" barrel???
     
  14. Darryl Cassel

    Darryl Cassel Well-Known Member

    Messages:
    1,757
    Joined:
    May 7, 2001
    Just food for thought fellows.

    A "belted" 300 weatherby Imp case holds the ten shot heavy gun World Record of 3.151" at the Williamsport 1000 yard club.

    As mentioned, there are lots of really good brass to be had, in the belted line.

    I believe the military (Army) still uses the
    300 Win mag in some/most of their LR rifles and team competitions of 1000 yards.

    Later
    DC