300 Win Mag and Magpro

Discussion in 'Reloading' started by Long Time Long Ranger, Jul 20, 2011.

  1. Long Time Long Ranger

    Long Time Long Ranger Well-Known Member

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    I have been having such good luck with magpro in a number of my rifles I tried it in my Tikka 300 win mag today. I could not believe the results in a 24" barrel. I loaded 86.5 grains with a 180 grain hornady sst and a cci 250 primer. Three shots were all touching at 100 yards at 3230 fps with a five fps spread. I went up to 87.5 grains with no pressure signs and over 3250 fps but the best accuracy was the 86.5 grain load. I have some 180 grain cutting edge bullets with the listed .6 bc coming in this week. I am very excited about getting a .6 bc at 3230 fps out of a 24" barrel 300 winchester accurately.

    Just thought I would throw this out there for you 300 win mag shooters.
     
  2. Firecat

    Firecat Well-Known Member

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    LT, How did you know where to start your charge weight with the MagPro? I can't find any data for it anywhere. Looks like you have a winner for sure. I can't get my load to break 3000 FPS out of a 24 inch barrel, let alone 3200 FPS
     

  3. Trickymissfit

    Trickymissfit Well-Known Member

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    email Doug Phair at AA Powder, and he'll send you data. They all seem to be a pretty good bunch over there. I'll see if I can't find his email adress in a few minutes
    gary
     
  4. Trickymissfit

    Trickymissfit Well-Known Member

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  5. Firecat

    Firecat Well-Known Member

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    Thanks Tricky.
     
  6. Trickymissfit

    Trickymissfit Well-Known Member

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    Doug has a lady that works with him (or for him), and she's really ontop of her game!
    gary
     
  7. Long Time Long Ranger

    Long Time Long Ranger Well-Known Member

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    I just work up my own loads using the powder burn rate. After a few rifles I have a good idea starting a new one. I have loads now with magpro for many cartridges and can just extrapolate and get it close. I load up five or so rounds starting with what I know to be a light load and go up until I hit pressure signs. Then I know my load range with that powder in that rifle. With the 300 winchester I went up to 87.5 grains with no pressure signs but hit that great load at 86.5 grains and staying with it.

    My data after 40 years of building about everything anyone could imagine is far more extensive and realistically accurate than any loading manual.
     
  8. Firecat

    Firecat Well-Known Member

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    Very Nice LT. Looking on their website, they have the data listed. Looks Promising. I think I may try it with some Tipped TSX. May also try with some Scirrocco's. What has your experience been with the 180 SST's. Is Hornady conservative with their BC of .480?
     
  9. Long Time Long Ranger

    Long Time Long Ranger Well-Known Member

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    In my opinion it is conservative. I just happenned to pick up that box of bullets when I did this load. I am sure it would have worked well if I had picked up the accubonds sitting beside them or the ttsx's. I have had good luck with the 180 sst's in the past and the bc seems to be listed low but I have never done any real long range testing with them. I load the 180 grain 30's for my mid range guns out to 800 or so yards and can't tell much difference between them and the accubonds listed higher. My choice would be the 180 ttsx among these though. I was basically just working up data and hit on this with the hornady's. I am trying the ce bullets with that load later this week with the high bc and see how that works out.

    If the 180 grain CE bullet hits close to that .6 I would make it a longer range gun though at those velocities.
     
  10. mooser

    mooser Well-Known Member

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    do you have any load data for this powder with 180 barnes bullets?
     
  11. Nomosendero

    Nomosendero Well-Known Member

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    LT, I do wonder what could be done with the Barnes 175LRX in the 300WM with this powder?

    Is this powder temp. stable?

    Have you tried this powder with the 264WM?
     
  12. Long Time Long Ranger

    Long Time Long Ranger Well-Known Member

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    I am loading 180 grain CE bullets tonight and am shooting those in the morning. They are monometal like the Barnes so I assume the load data would be very similar.

    I do not know how temp stable the magpro is. We have taken a number of animals with magpro in the 257 wby to 600 yardsbut I keep all my bullets the same temperature during hunting so wouldn't know.

    I am confident this powder will be great in my 264 winchester but have not tried it yet. It does wonders in the 257 wby which is virually the same size case and .007caliber difference. We shoot amazing groups at 3760 fps with magpro and 100 grain ttsx in the 257 wby.

    I will report after I shoot in the morning.
     
  13. phorwath

    phorwath Well-Known Member

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    MagPro is rumored to be reasonably temperature stable. I haven't proven it one way or another myself. This is just what I've read.
     
  14. Nomosendero

    Nomosendero Well-Known Member

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    Thanks for the reply. I think in these terms more & more because I shoot here in AR in the Spring & Summer (hot) & then go on Western hunts in the fall,the temp difference is huge.

    And of course you can make adjustments, but the more consistant the better.