270WSM and magpro?

Discussion in 'Reloading' started by Deederswy, Mar 10, 2014.

  1. Deederswy

    Deederswy Well-Known Member

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    Ive seen some older post with people using magpro with their 270WSM's....has there been more that have used it and if so what kind of results have you gotten? I was thinking about shooting the 140 AB....
     
  2. Shortmagman

    Shortmagman Well-Known Member

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    I have loaded Magpro behind both 140 TSX, and 140 Accubonds. My Winchester Model 70 with a 24 inch barrel produced 3150+ ft/sec with both bullets. My accuracy was not quite as good as it is with IMR-4350 or RL-22, but Magpro seems to work best at or near the max. loads, and it does give very good velocity out of the 270WSM's.
     
  3. Lefty7mmstw

    Lefty7mmstw Well-Known Member

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    Just don't use fed primers and magpro. I tossed a half pound of magpro some years back as we were having hangfires in multiple calibers (including the 270 wsm and 7rem) using it. Later I called sierra on data for wssm's when they came out, and spoke with them about magpro also; it seems there is an issue with the chemistry of the two not playing well together. He said to go to win or cci and you would likely be fine; by then the powder was in the trash though.
     
  4. Shortmagman

    Shortmagman Well-Known Member

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    Lefty,

    That is quite interesting. I have always used WLRM primers with Magpro without problems. I just went back to the data from Accurate Arms when they were selling Magpro and found that they used WLR primers, so I probably do not need to use the mag primer.gun)
     
  5. Trickymissfit

    Trickymissfit Well-Known Member

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    have to kinda wonder where that information came from. I don't shoot the WSM, but use Magpro, and like it. I use it in the 270mag as an alternate to 3100, and yes I use Federal primers with zero problems. I have used CCI and some Winchester primers as well. Magpro (for me) seems to work best with heavy bullets, and found the 150 grain bullet to be best so far.
    gary
     
  6. robdaniels

    robdaniels Well-Known Member

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    I use MagPro in my 270 WSM with 130, 140 and 150 bullets all shooting well
    Have used Federal and Winchester Mag primers both without a problem.
    MagPro is good, but I think it is very dirty burning. And yes it likes a Max load.
     
  7. Lefty7mmstw

    Lefty7mmstw Well-Known Member

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    Tricky, the hang fires were with our rifles and fed primers. When I wiggle the little lever on the bottom on a 7mag (or my dad does on his 270wsm) and it takes a second or two to blow there are issues. I wasn't sure what caused the issues as it was only with that powder and really didn't care... still don't. I'm not a fan of slow ball type powders though I use a couple on occasion. They often burn dirty and have little application that a stick powder can't beat save for pushing a case that's a bit small for the performance you are looking for. I was just relating an experience we had with someone's explanation of the likely culprit.
     
  8. feelinducky

    feelinducky Well-Known Member

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    I was trying magpro in my 270WSM 140g AB's and fed primers. I could not get any consistency with it, like 100fps spread. But now you have me thinking about the Fed primer thing. I may go back and try it again with cci's.