MVP & steel case ammo

Discussion in '223 / 5.56 MVP and Variants' started by TexasPete, Dec 27, 2016.

  1. TexasPete New Member

    Member Since:
    Aug 7, 2016
    Message Count:
    4
    Anyone else use steel case ammo (e.g. Tulammo or Monarch) in their MVP? If so, have you had any issues with it? I'm wondering if I'm dealing with a broken extractor due to this ammo not ejecting properly.
  2. wood chucker Moderator

    Member Since:
    Dec 19, 2012
    Message Count:
    1,599
    Hi Texas Pete and welcome to the boards.
    Sorry to hear about your troubles. If it were me I'd contact Mossberg by phone and fax and email right away and send it in. So far the only extractor issues to date have been with steel case ammo.

    I apologize right off for repeating the next part if you already know it.
    That steel case stuff don't spring back down after firing like brass does and the steel itself isn't slippery like brass either. Steel cases has a better than average grip on the chamber walls after firing which makes extraction a real chore.

    The biggest reason I don't shoot steel case and try to steer folks away from it is the bullets are almost always steel jacketed, copper washed but steel jacketed. Put a refrigerator magnet on the bullet you'll see what I mean. Steel jackets are softer than barrel steel but nowhere near as soft as copper.
    They are rough on bores. I found that out the hard way once. These other fellas did some scientific testing on copper vs steel for wear and accuracy. http://www.luckygunner.com/labs/brass-vs-steel-cased-ammo/
    Fritz373 likes this.
  3. Keith Moderator

    Member Since:
    Dec 7, 2014
    Message Count:
    1,185
    I have not run steel for the reasons stated above. Bolt rifle chambers are generally a tighter tolerance than semiautomatic rifle chambers, so semiautomatics can tolerate steel better. Though, they still are known to have issues from time to time. Personally, I would steer clear of steel cased ammo. The rifle wasn't designed with steel cases in mind.
  4. spamassassin Well-Known Member

    Member Since:
    Aug 8, 2014
    Message Count:
    1,114
    Shot a lot of it initially before I put the rifle in match configuration. The steel jacketed copper washed bullets were very hard on my barrel (I've got a replacement coming since it's basically shot out now) and I fragged at least 2 extractors with that stuff. I've also blown extractors from excessively hot ammo. I think I'm on my 5th extractor now but I'm extremely hard on them with fast cycling, hot loads, extended strings of fire and the steel cased stuff did not help. Now using brass cases, proper copper jacketed match bullets and backing my loads down from too hot to just hot and I haven't blown an extractor in over 1,000 rounds. Take that for what it's worth.
  5. TexasPete New Member

    Member Since:
    Aug 7, 2016
    Message Count:
    4
    Thanks for the feedback everyone! I primarily went with steel case for the price since I'm just a "plinker", but I'm beginning to think steel case isn't worth the hassle. I guess I'll have to re-evaluate my bulk ammo purchasing.

    I'm still waiting on Mossberg to get back to me about the extractor. Reading around this forum and others, I see it's not an uncommon problem. Too bad because I really like the MVP.
  6. spamassassin Well-Known Member

    Member Since:
    Aug 8, 2014
    Message Count:
    1,114
    The feeding issue exacerbates the extractor fragility with steel cased ammo. You run the bolt forward and the round doesn't feed right and the rim and extractor often have to decide who wins. If the extractor doesn't slide over neatly which it often doesn't on the steel cases then you get a break.
    Fritz373 likes this.

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