Worked up some 308Mx and 338Mx up dated 2-23-11 with load data and chrono data
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Thread: Worked up some 308Mx and 338Mx up dated 2-23-11 with load data and chrono data



  1. #1
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    Worked up some 308Mx and 338Mx up dated 2-23-11 with load data and chrono data

    It was warm enough to go shooting today temp 55 degrees, Wind 10-15 MPH and more wind than I like but hea it beats not shooting. Relative humidity 81% Pressure 26.96. I only got 3 loads shot for the 308MX. I figured I would try the Hornady 150 gr GMX #30370. this bullet would only be able to be loaded with one in the chamber and one in the mag, but I figured it would be fun to work up anyway. I shot Leverevolution powder, the targets were shot at 100 yards with the wind at my back with a right to left quartering angle across the range. 42.0 gr = 1.5 inch, 42.5 gr = .25 inch..yes 1/4 inch, and 43.0 gr 1.75 inch. Hornady brasss and Win LR primer

    Pic of the 42.5 gr 150 gr GMX load


    The 338 MX didn't go so well. I tried the Barnes 185 gr TSX HP bullet with Hornady Brass, CCI 200 Primer and Leverevolution powder 45.5 gr = 2.75 inch, 46.0 gr = 2.25 inch, 46.5 gr = 2.75 inch, 47.0 gr = 4.0 inch, and 47.5 gr = 4.0 inch,

    Also shot the 200 FTX bullet with same brass and primers

    45.5 gr = 3.0 inch, 46.0 gr = 3.5 inch, 46.5 gr = 3.25 inch, 47.0 gr = 3.5 inch, 47.1 gr =3.0 inch

    Not real impressed with the 338 results.

    I did not check any velocities it was too windy to try and set up the chrono and I usually don't bother to check velocities until I have an accurate load. It takes concentration away from shooting a group to try and have the chrono lined up so I don't put a bullet through it.

    Back to the loading bench.
    IN MEMORY OF PFC JEFFREY ALAN AVERY, 571st MP CO, KILLED IN ACTION 23 APR 07, AGE 19, MUQUDADIYAH, IRAQ.

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    Re: Worked up some 308Mx and 338Mx loads today

    So tell me, on the 338 loads were they much worse than factory? Seems like that gun should shoot a lot better than what you got. Looks like Hodgdon gives a max load of 47.5 gr of the LVR powder. But 3 - 3.5" groups are not what I would expect. I'm going to shoot mine with AA2520 on Saturday if there isn't any wind. I want to see what kind of groups I can get at 100 yards.

    The 308 was really a winner. Makes me wonder if the LVR powder isn't optimized for lighter weight bullets, particularly in 30 caliber. Looks like the 150 gr was a pretty sweet spot for it.
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    Re: Worked up some 308Mx and 338Mx loads today

    See thats what happened to me and some one said something about cripping, but I have tryed it a couple times and am not impressed so now I'm going to try A 2520 and have bought some. Dennis

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    Re: Worked up some 308Mx and 338Mx loads today

    Quote Originally Posted by Halwg
    So tell me, on the 338 loads were they much worse than factory? Seems like that gun should shoot a lot better than what you got. Looks like Hodgdon gives a max load of 47.5 gr of the LVR powder. But 3 - 3.5" groups are not what I would expect. I'm going to shoot mine with AA2520 on Saturday if there isn't any wind. I want to see what kind of groups I can get at 100 yards.

    The 308 was really a winner. Makes me wonder if the LVR powder isn't optimized for lighter weight bullets, particularly in 30 caliber. Looks like the 150 gr was a pretty sweet spot for it.
    My rifle shoots right around an inch or better with factory ammo and with my AA2520 load. My rifle. Shoots three inch groups at 300 yards not at 100 yards. I have my doubts that this is the same powder as the factory ammo.
    IN MEMORY OF PFC JEFFREY ALAN AVERY, 571st MP CO, KILLED IN ACTION 23 APR 07, AGE 19, MUQUDADIYAH, IRAQ.

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    Re: Worked up some 308Mx and 338Mx loads today

    Yea! so I have two pounds of LE for sale, maybe good for blowing stumps. Dennis

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    Re: Worked up some 308Mx and 338Mx loads today

    yes 1/4 inch
    That's great! Good work!

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    Re: Worked up some 308Mx and 338Mx loads today

    Quote Originally Posted by big medicine
    My rifle shoots right around an inch or better with factory ammo and with my AA2520 load. My rifle. Shoots three inch groups at 300 yards not at 100 yards. I have my doubts that this is the same powder as the factory ammo.
    I've always had good results with AA 2520 and heavier bullets. It does better for me with the 200 gr and 220 gr 35 caliber bullets. It's also done very well for me in the 338 and the 200 gr FTX with the limited testing I have done. Groups as tight as the factory loads. I just don't know how the velocity compares because I haven't been able to use the Chrony due to the weather.

    I'm thinking this LVR powder is the blend suited to the 30-30 and the 308. I noticed that they really didn't list a lot of calibers to use it with. I thought of getting a pound to try in the 30-30, but I have a good load with H4895, so I see no reason to change.
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    Re: Worked up some 308Mx and 338Mx loads today

    Got back out today and shot again. Time 1700, Temp 49 degrees, Wind none, Humidity 49%, pressure 30.18 great day to shoot. I shot some loads for the 308MX and the 338MX once again.

    338MX Hornady Brass, CCI 200 primer AA2520 powder Barnes 185 gr TSX HP bullet. (Note: This load is only to be loaded with one in the chamber and one in the mag tube) added note (there is no published data for this load so you need to use caution at your own risk)

    43.0 gr = 2 shots touching total group 1 inch, 43.5 gr = 3.0 inch, 44.0 gr = 1.5 inch, 45.5 gr = 2.25 inch

    308MX loads shot with Horndy brass and Rem 7 1/2 primer Leverevolution powder
    150 gr GMX (again this is one in the chamber and one in the mag tube)
    42.5 gr 2 shots touching total group .75 inch, 43.0 gr = 2.0 inch, 43.5 gr = 1.25 inch, 44.0 gr = 2 shots touching total group 2.0, 44.5 gr = 2 shots touching total group 1.0 inch, 45.0 gr = 2 shots in same hole total group 1.0 inch

    160 FTX 308MX bullet Leverevolution powder
    41.0 gr = 3.0 inch, 41.2 gr 2 shots touching total group 1.0 inch, 42.0 gr = 2.5 inch, 42.6 gr = 3 shots touching total group just a little over .25 inch ( pic)


    I had given up trying to load for the 38MX because I could not find any powder bullet combo that shot worth a dang. I spent much of 2008 trying different powder bullet combos and nothing was worth loading. Now finally something that shoots.

    I need to go back and rework these loads that shot well and see if they are consistant and get some velocity data.
    IN MEMORY OF PFC JEFFREY ALAN AVERY, 571st MP CO, KILLED IN ACTION 23 APR 07, AGE 19, MUQUDADIYAH, IRAQ.

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    Re: Worked up some 308Mx and 338Mx up dated 2-18-11

    You know I think we will find the perfict load for both the 308 me and the 338 me but I really don't think it will be the LE powder. but let's keep looking. Dennis

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    Re: Worked up some 308Mx and 338Mx up dated 2-18-11

    I just love seenin them cloverleafs. Good shootin Big Medicine. DP
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