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.22-250 Primer backing out

Discussion in 'Handloading and Reloading' started by Theinkman, Dec 20, 2020.

  1. Theinkman

    Theinkman Member

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    I am reloading some Sierra 45gr spitzers for my R700 SPS Varmint in .22-250 and am seeing primers backing out 4-5 thou. Using Varget 36.0 and 36.5 grains working up a load. I got excellent accuracy from both loads-5 shots a dime could cover. New Hornady brass, checked with a comparator at the shoulder datum prior to firing at 1.561-1.562. After firing these loads, the fired rounds check out at 1.561-1.562. Fired some factory loads and those are at 1.566 on the comparator. So it appears my brass is not stretching at all during firing with these loads.

    Lyman 50th says 36 gr of Varget for a starting load, Hodgdon shows 35 gr with a 45 gr bullet. No pressure signs at all. My son has the same rifle and his brass is doing the same thing. I'm thinking a low pressure load, but I really like the accuracy.

    Don't believe there is a problem, but wanted feedback from you all.
     
  2. troy fairweather

    troy fairweather Member

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    36.0 is 2 grains over max for the 45 in my data
     
  3. AJC1

    AJC1 Member

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    Primers can only back out if there is room in the chamber to do so. Use your comparater and measure from base of primer to shoulder. Minus .001 and that should be the demensions of your sized brass. You have to much headspace
     
  4. Theinkman

    Theinkman Member

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    What manual are you using? I just double checked both the Lyman and Hodgdon manuals and they are exactly as I stated for .22-250.
     
  5. troy fairweather

    troy fairweather Member

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    Hornady 9th edition.
     
  6. Theinkman

    Theinkman Member

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    I get the concept of too much headspace but my brass is not stretching at all. These rounds were not FL sized prior to loading. I sized the neck to ensure there was adequate tension to hold the bullet. If I take the measurement you suggest, I come out with 1.566. My brass going into the chamber is 1.561 and after firing it is 1.561. I don't understand how that can suggest excessive headspace.
     
  7. Theinkman

    Theinkman Member

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    Troy-I have the Hornady 10th and they show a 45gr bullet for a .22 Hornet. This bullet is not designed for .22-250 so I didn't use the load data for it.
     
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  8. troy fairweather

    troy fairweather Member

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    Any chance the bottom of the brass is cuped you have any pictures. Did you try different primers.
     
  9. Theinkman

    Theinkman Member

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    Troy-the brass looks fine-just like new! I don't have any other primers. Currently using Federal GM210M. I will try to get pictures of the brass in a little bit. Honey do's are happening right now.
     
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  10. troy fairweather

    troy fairweather Member

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    Ok take your time, I had a Remington 700 22-250 that did the same thing. I never found out why, it would close right on a fl sized round.
     
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  11. AJC1

    AJC1 Member

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    I only know one way to check for sure and that's to shoot a jammed bullet if that's even possible based on the length of your throat. That's not favored by some shooters and I would not do it with a max load. It will pin the case to the bolt and blow the shoulder forward.
     
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  12. South Prairie Jim

    South Prairie Jim Member

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    .005 Headspace ?
     
  13. edwardware

    edwardware Member

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    @AJC1 hit it:
    and your pressure is low enough that you're not stretching the brass back onto the primer.

    It's not an immediate concern, but DON'T bump shoulders until the brass stretches out enough to leave 0.000" headspace (no primer backing), then bump 0.002".
     
  14. South Prairie Jim

    South Prairie Jim Member

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    This /\ /\ +1
     
  15. Grumulkin

    Grumulkin Member

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    Gentlemen,

    A load that is too heavy doesn't make primers back out. It will flatten them out to the edge and you can get pierced primers but they don't back out. It's also highly unlikely that the problem is too much headspace. Excess headspace will cause incipient head separations and head separations but I have never found it to make primers back out. In addition, primers backing out 0.005 inches is minimal and would give me no worries at all.

    So, what is the problem? The load is a little light. My Speer manual for the 22-250 loaded with Varget and 45 grain bullets has a maximum load of 38.5 grains and the maximum load for that combination in my Lyman manual is a compressed load of 39.5 grains. Loads in the manuals are based on pressure guns, different brass, different bullets, etc., so probably aren't going give exactly the same pressure as what the handloader will get.

    The accuracy of the load is apparently excellent. It could be left as is or could be increased. My practice is to increase a load until the groups start opening up and consider that the maximum load and then go back to the one that gave the best accuracy. That would be assuming I wasn't getting sticky extraction or primer signs of excess pressure.
     
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  16. Theinkman

    Theinkman Member

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    That was my plan.
     
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  17. Theinkman

    Theinkman Member

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    Exactly what I was planning on doing. There is advice floating out there that low pressure fired cases should never be loaded with higher pressure loads. Doesn't make sense to me and I think my next load wouldn't have to be higher pressure. I think the case is going to stretch over time even with the same loads. Accuracy is great-I'm going to continue to work with these loads.
     
    Last edited: Dec 20, 2020
  18. South Prairie Jim

    South Prairie Jim Member

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    There is a lot of mis- information on the internet.
    Im not sure what a low pressure fired case is supposed to be.
    There are virgin cases
    Once fired cases
    Fully fire formed cases
    FL sized cases
    Neck sized cases
     
    Last edited: Dec 20, 2020
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  19. Theinkman

    Theinkman Member

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    Apparently a low pressure fired case is one that is loaded and fired with a "low pressure" charge of powder. I actually did find that term on the internet. I won't be using it in the future.
     
  20. Bfh_auto

    Bfh_auto Member

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    Another way is expand one to 243 and size just enough for the case to chamber. I have done this with good results. I do anneal though.
     
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  21. Bfh_auto

    Bfh_auto Member

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    That is in reference to cat sneeze/ bunny fart loads.
    People use extreme low charges of pistol powder or too low charges of rifle powder that don't create enough pressure to resize the brass.
    The primer pushes the shoulder back causing excessive head space after multiple uses.
     
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  22. AJC1

    AJC1 Member

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    I forgot about the false shoulder. Great thought.
     
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  23. South Prairie Jim

    South Prairie Jim Member

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    He shouldn't really need to false shoulder a 22-250 just to get a case to fill out, I also would not do load work up on virgin cases to avoid chasing the tune.
    I suggest jamb that bullet and hit um again
     
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  24. Bfh_auto

    Bfh_auto Member

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    I wasn't trying to suggest doing that. Just that it is another way of the headspace is off.
     
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