"Fire Formed" brass don't fit?

Discussion in 'Gunsmithing Forum' started by lightninman, Oct 29, 2010.

  1. lightninman

    lightninman New Member

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    Put a new barrel on my 30-06 model 700. I have always only "neck sized" my brass, and the old brass didn't fit the new barrel (no surprise here). I "full case" sized the brass, and all is fine. Worked up some loads and went to the range. I have 3 of 6 combos that are already sub-MOA! I'm thinking I love my new barrel! But when I made up the next set of test rounds (neck sized only), they will not chamber? This is the same brass that was fired from this barrel? They were a little tight to eject, but not to the point that I was at all concerned.

    I guess my question is this; can this be saved (short of gun-smithing heroics), or should I just go ahead and have the thing chambered to a 300? Should the gunsmith that fit my barrel Fess up here, or is his obligations done (it does shoot spec ammo)? Anyone know a GOOD gunsmith in the Savannah Area? I really wasn't expecting to spend more money on this thing!
     
  2. Fisherking

    Fisherking New Member

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    It is a new chamber and mabey the chamber is polished to smooth. I would shoot it and basicaly break in the barrle and chamber full length resize for a while and then after the polishing is knocked off try just neck sizing after that.
    How many rounds does it have down the tube?
    I would figure after around 200 or so you should not have this problem.
    F.K.
     

  3. Dillinger

    Dillinger New Member

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    If your brass was:

    1) Still hot when you ejected it &

    2) A little tight to eject

    I would expect that some of the swelling of the brass happened after you removed it from the chamber, and thus you would have a problem trying to put it back in, since it was left to it's own devices.

    If you have a tight chamber, this could be the issue. The thing is just "-" that much too tight all the way around to allow for reloads.

    I am afraid it is early and my head isn't exactly on straight, so I don't have any immediate answer for you in addition to the fact that I am nowhere near the reloader that half the guys here are.

    But I will bump this up and ask for help from the guys.

    JD
     
  4. cpttango30

    cpttango30 New Member

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    I would smoke a cartridge to see just exactly where you are hitting in the chamber.

    A tight chamber is exactly what you want. Factory chambers tend to be towards the larger side of SAMMI specs.

    What kind of throat was put in it? Maybe your bullets are too long.

    It might be because your are full length sizing the brass you are bumping the neck back just enough to chamber. Are you using a neck sizing die or are you using a FL sizing die and adjusting it to neck size?

    If you are using a FL die to neck size you are not bumping the shoulder back and that is your problem.
     
  5. Highpower

    Highpower New Member

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    I think tango is right on the money. You need to bump the shoulder back about 1 or 2 thou, and I think you'll be golden assuming your case length and chamber throat are in harmony.

    I load mainly for semi-autos, but I still follow the above for my long range rounds. I use Redding competition dies for those utilizing the type S - full bushing dies. I can adjust the die body to give me a .002" bump on the shoulder so that I don't under-size the case, yet I can adjust the amount of neck sizing independently of the die body.

    Those dies are the berries IMHO. YMMV.
     
  6. stalkingbear

    stalkingbear Active Member

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    It sounds to me that you need to adjust your FL resizing die to "kiss" the shoulder just a bit harder. It's common for just a couple thousands of a inch of neck to remain unsized when using FL dies and neck sizing. I'd also back off a grain or so of powder and check to see that your necks don't need to be turned. It sounds like the chamber is correctly reamed to me or the FL resized ammo would give you problems as well.
     
  7. lightninman

    lightninman New Member

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    There are only about 75 rounds thru it. I would love for you to be right. I was wondering about actually polishing it more (close to the bolt?? Like maybe the taper is "just" off?
     
  8. lightninman

    lightninman New Member

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    The barrel might have been warm at the range; I thought maybe the brass might be swollen in the middle, but the Mic doesn't show it? When the brass don't fit, it is by about an 1/8" or more shy from chambering? I ment to address everyone that replied (i really do thank ya'll for the input), but it looks like I am just being added to the bottom. To the guy with the ability to "neck and shoulder" only, thanks, but I can't do that with my dies( don't think that I'm not interested if the shoulder is the problem!) That would be sweet. I will try and die or "Smoke" the brass and figure out just where the problem is. I just got a bit excited about the problem and posted before thinking past "poor taper" or "out-of-round chamber". "Man, you gotta love the internet and people willing to share ideas to your problems"!!
     
  9. JonM

    JonM Moderator

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    i would do this first. i bought 250 rounds of mil-surp 308 for my rem700 xcr compact just to do a thorough shoot in. although yours is prolly much tighter than my rifle i would try shooting it a bit more before adjusting you die settings.
     
  10. lightninman

    lightninman New Member

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    A sharpie worked real well for marking the shell. I dropped it in, caught it with the bolt, and just giggled it. It looks like the whole chamber is uniform except a spot on the shoulder. I will try the shooting thing first, but I have a feeling the nice die set is in my near future.

    [​IMG]
     
  11. cpttango30

    cpttango30 New Member

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    light did you put that cartridge in the mag and chamber it that way or did youjust drop it in the rifle and run the bolt closed?

    If you put it in the mag that could account for the two spots where it was rubbed off. Try seating a bullet like you would normally do.

    Color the case up to the case mouth and color the bullet as well.

    You could have a short throat and you could be jamming the bullet into the rifling. That unto itself is not a bad thing you just have to adjust your load accordingly.

    If you have a tight neck and a short throat your going to find out with a bullet seated. That is what I am thinking.

    You may need to invest in a neck turning tool. You can always call your smith (Who I am sure would want to help you find out what is going on) and ask him about your problem. Me may be able to say oh yeah I chamber to the SAMMI min specs so you may need to trim and turn the necks.

    Hornady Manufacturing Company :: Reloading :: Metallic Reloading :: Tools & Gauges :: Case Care :: Neck Turning Tools

    I would pick one up and just uniform the case necks and see what happens.