belted cartridges

Discussion in 'Long Range Hunting & Shooting' started by jlvandersnick, Jul 16, 2019.


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  1. longrangebob

    longrangebob Well-Known Member

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    My first belted magnum was my 300 in 74 - predominantly Neck sized but when I got new barrel(s) full sizing advisable & Larry Willis’s Die made all the difference in keeping most of my long used - brass — had a number of belted magnums since (340 my new fav since 95) - now a whole # of non-belted - following 06 History a lot older as started with it when younger - ALL are good - but strongly suggest neck sizing till bit stiff to close bolt then 2-3 thousands set back with full length resizing except Hunting Dangerous or Long Range Match when full length advisable - & annealing for those matches -
     
  2. DavidleeCole

    DavidleeCole Well-Known Member

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    Nov 7, 2014
    I have had issues with my .300 Whby mag in the past when I first started loading. I was running the die all the way down till it bottomed out on the shell holder then another 1/4 turn like the manual said. It was oversizing the brass and I was doing this every load so after about 3 to 4 loads and the head would come off. Frustration is what it was. Now I don't load like that and overwork my brass sp i have not had that problem yet and i am well on the 6th loading of my brass.
     
  3. Shootin4fun

    Shootin4fun Well-Known Member

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    Dec 3, 2010
    This is what I have experienced in my 7RM as well. If I only NS, bumping .002 when I do FL size, then about 2 - 4 firings will require FL sizing again. Here we go back into the debate of FL vs neck sizing. Because when we NS, each time we fire, the case is pushing the shoulder out and it is not being made consistent with previous firings. A guy has a whole video on one of our other threads here exhorting the reasons NOT to NECK SIZE. It makes sense to FL size every time, having the die set to bump .001 - ,002. That way the cases are always the same dimentions, no capacity change, no energy expended in expanding the brass a different amount when it finally hits the chamber shoulder area (requiring another bump). But I have not done controlled experiments over say 4 firings to compare velocity or POI changes as the NS cases' shoulder grows. Generally, I can't say I see a POI shift as they grow. And I have not compared my chrono results looking for a pattern over successive NS firings. I have been NS my 7RM and 6.5CM for a few years now. It's so much easier and faster. But on the 6.5 I am reverting back to FL every time. For one thing, it seems to me that it forces better runout numbers. The case is fully supported by the sidewalls of a FL die so the neck always hits the bushing in the same axial position every time. With NS, axial alignment variances can occur. Just my own ponderings...
     
  4. bigngreen

    bigngreen Well-Known Member

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    Issues of o we sizing and having case head separation are not any different issue between belted or non belted, the issue is simply not sizing down the very small area just ahead of the belt which eventually for some causes stiff bolt close at some point. Even the small area just touching the chamber is not beneficial to accuracy.
     
  5. 22250imp

    22250imp Member

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  6. 436

    436 Well-Known Member

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    J E Custom likes this.
  7. CatShooter

    CatShooter Well-Known Member

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    I'll say NEVER, cuz your example is out of context to the original post...

    That refers to removing the belt and leaving it in the original calibre. And no company makes headspace gauges for belted cases to headspace on the shoulder... they all measure the belt to bolt face headspace.

    so I will spell it out for those that have problems reading and understanding plain Engrish.

    There is never a reason to remove the belt on cases that will be fired in the original chamber/calibre. You simply adjust the die to headspace on the shoulder. It could not be easier.
     
  8. trhall

    trhall Well-Known Member

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    Aug 10, 2010
    The Secret Service, FBI, and Military all use belted case 300 win mag. They also all use the Larry Willis Collet die to alleviate brass thinning just above the belt after multiple firings. Larry recommends every third firing and this has worked out well for me over the last 15 years.
     
  9. bigngreen

    bigngreen Well-Known Member

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    Excellent job of spelling that out in plain English there rock star!
     
  10. MudRunner2005

    MudRunner2005 Well-Known Member

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    I’m 100% sure the federal government and 99.9% of the MIC doesn’t reload their own ammo. The only exception being the AMU (and other similar military units of each branch) for competitions and testing.
     
  11. JCSZ

    JCSZ Member

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    Jun 11, 2013
    I have always full length sized my 300wm and there isn't an issue. If I remember right, this was spewed onto the internet as marketing hype for the then NEW belted magnums.
     
  12. MudRunner2005

    MudRunner2005 Well-Known Member

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    You realize that the .375 H&H, (the original "belted magnum" that was the parent case for pretty much all the belted magnums we have today) has been around since 1912, right? And that most of the "new" belted magnums we have today were designed and introduced in the 40's, 50's, and 60's, right?

    I could be wrong, but I'm pretty sure the internet wasn't around back then...
     
    436 likes this.
  13. blackaj

    blackaj Well-Known Member

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    Anyone else need to get on here and reassure themselves that belted mags are the best thing ever..
    And anything without a belt is pure marketing hype:rolleyes:
    Cracks me up fellas
     
    Orange Dust, bigngreen and Barrelnut like this.
  14. MudRunner2005

    MudRunner2005 Well-Known Member

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    Be careful, don't go looking into a mirror... Your own bias is showing... You know, that thing you were just making fun of because you believe the opposite... But instead managed to make yourself sound just as ridiculous as a non-belted fanboy. ;)

    I own just as many non-belted, as belted cartridge chambered rifles... Also a couple of rimmed centerfire cartridges... Nobody said anything was the best thing ever, or that it was better than anything else. But nice try at the attempted sarcasm.
     
    Frog4aday likes this.