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Case preping for match ammo

Discussion in 'Ammo & Reloading' started by Jcann, Jun 2, 2018.

  1. Jcann

    Jcann Sharpshooter

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    These are the tools I use:
    Calipers
    K&M Neck turning tool
    VLD Chamfer Tool
    Head Space Gauge
    Neck Expander Die
    Primer Flash Hole Deburring Tool
    Case Body Resizing/Headspace Die
    Primer Pocket Reamer
    Outside Neck Chamfer Tool
    IMG_2525.JPG

    I'm using brand new Winchester 7wsm brass. First I run them through the body resizing die so the headspace will be consistent. This die does not touch the neck. I check headspace in the headspace gauge. Next I run them through the neck expanding die using plenty of wax.
    IMG_2522.JPG

    After the necks are expanded I trim to a case length of 2.09" +/-0.0005". Consistent neck length affects bullet tension.
    IMG_2523.JPG

    After they're all trimmed and deburred on the outside I turn the outside of the necks to 0.0015". Again this aids in consistent neck/bullet runout and bullet tension.
    IMG_2521.JPG

    Next I chamfer the primer flash hole for consistent ignition and ream the primer pocket.
    IMG_2524.JPG

    The final steps are resizing the necks with my bushing die, chamfering the inside of the necks with the VLD Chamfer tool, cleaning excess wax out with a Q-Tip, and brushing the inside/outside neck plus shoulder with a 3M stripping pad.

    Since this is new brass and my chamber throat has eroded slightly I will need to measure cartridge base to ogive length. I will be conducting another Optimum Charge Weight (OCW) with H1000 powder loads of 65.0, 65.3, 65.6, and 65.9 grains. Velocities with Berger 180 grain Hunting VLD should be around 2,860 to 2925 fps.

    I'll post results once I make it to the farm to shoot these.
     
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  2. dlbleak

    dlbleak Moderator Staff Member

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    Nice write up. Thanks
     
  3. Jcann

    Jcann Sharpshooter

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    Took some measurements to obtain base to ogive and loaded 20 rounds in 5 round lots with each lot a different powder charge



    5890E832-8475-42A0-B0B2-19CEEFED0B05.jpeg 8AA1A88E-C888-4499-835A-75399369A3E8.jpeg
     
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  4. Jcann

    Jcann Sharpshooter

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    8214AB3D-65CC-4D33-9E09-977CB53A40F8.jpeg
    Was out today running an OCW. Both the 65.6 & 65.9 grain charge weight show promise. The 65.9gr had a muzzle velocity of 2,957fps and measured 0.462” and the 65.6gr had a muzzle velocity of 2,920fps and measured 0.427”. Both at 100 yards.
     
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  5. Jcann

    Jcann Sharpshooter

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    C92B94AF-C7FB-423E-91F6-750800A8527E.jpeg

    My sons 260 Rem was a different story. Hodgdons web page list 42.9grs as max charge for Hornady 143gr ELDX bullet. We had ejector marks on the Lapua brass at 42.4grs. I stopped pushing it at 43.3grs. I’ll run another OCW with charge weights below 42.4grs. I didn’t run any through the Magnitospeed although I did like how the 42.7 charge weight grouped. I ended up piercing a primer on the 43.3gr that's why the there is only two shots on the target and the group is mucked up.
     
    Last edited: Aug 25, 2018
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  6. Shadowrider

    Shadowrider Sharpshooter

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    Your process looks great! What kind of matches are you prepping for?
     
  7. Jcann

    Jcann Sharpshooter

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    I'm not working up anything for a match. I'm just trying to get loads that shoot sub 1/2 MOA for an upcoming antelope hunt. I'll load up about one-hundred rounds and shoot them at least to 900 yards and points between before the hunt. I'm also breaking in a new scope and need to gather ballistic data in mils rather than moa like with my old scope.

    Rifle.JPG
     
  8. Shadowrider

    Shadowrider Sharpshooter

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    Your title said match ammo. I was like "what's he shooting with 7mm WSM?" lol

    I have a .270 WSM. I wish it would shoot those groups. If I restock it and prep like that maybe it would.
     
  9. Jcann

    Jcann Sharpshooter

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    If you take your time and work with it, usually you can find a load your rifle likes. Of course its always much easier if you have a match grade barrel, bedded action, good trigger, and a nice composite stock. My rifle generally shoots best with somewhere between 65.5-66.0 grains of H1000 powder with Berger 180gr bullets. Most of the time I need to find my seating depth. Over time my barrel has suffered throat erosion which changes my bullet seating depth. Eventually I'll run out of magazine width.

    For long range application you don't need to strive for a one hole group. One half MOA at 100 yards will do just fine. If I happen to get groups in the 0.2's or 0.3's its by luck. I'm happy with 1/2 MOA, low ES/SD, and a velocity somewhere between 2850 and 2950fps. This load will lay the wood to anything in north America except maybe the big bears.
     
  10. swampratt

    swampratt Sharpshooter

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    Jcann good reading on all of it.
    On the load work up I found my rifles do not show what really happens to the load until I get 200 yards or farther.
    Not busting your chops but I was kind of saddened you wasted those match loads on 100 yard paper trying to fing OCW.

    My best ever groups for my .308 were in the .275" area at 100 yards with 178A-max in .308.
    But I was very puzzled after I had shot that same load many times at 100 yards and it never grouped larger than .4" and I shot at a deer at almost 200 yards and drove the bullet through both shoulders and piled up the buck where he stood.

    I was puzzled because I was not aiming at the shoulder I was aiming at the neck.
    I later that week took the same load and shot at paper at 200 yards it was making 12" groups at 200.

    Never have I seen anything so terrible.
    Now I shoot my worked up loads at 200 yards..and I have found what groups best at 200 yards will in fact group best at 300-400 and 500 yards.
    But I take those loads and shoot at 100 yards and they really do not look impressive like 3/4" groups.
    Nothing to write home about for sure.. but at 200 they remain 3/4" groups.
    Just saying.
    My barrels are factory fodder never had a custom one.
    So your results are probably different.
    The farthest I shot groups on paper is 500 yards but they stay sub MOA.
    I never had a fast round like the WSM stuff.
     

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