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Thread: Power Pro 300 MP as SR 4759 replacement

  1. #1
    Boolit Master
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    Power Pro 300 MP as SR 4759 replacement

    As the title says, has anyone been using this instead of SR4759? What is your experience?

  2. #2
    Boolit Master Lagamor's Avatar
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    Don't mean to go off topic, but most 410 skeet shooters I know claim it is the best currently produced powder for 410. Has the slower burn rate of H110, without the migration issues. If you can find it, count yourself as lucky.

  3. #3
    Boolit Master
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    Got my hands on some Alliant Power Pro 300 MP. Here are two groups compared. Both are from my 20" barreled Remington 700 .308 Win. 1-10 twist with Leupold VX1 2-7x33. Groups are 10 shots each.

    First: IMR SR4759
    Attachment 196032

    Next: 300MP
    Attachment 196033

    These two loads are identical in every way except for the powder. I have read elsewhere on the forum (http://castboolits.gunloads.com/show...=1#post2579046) that it may be necessary to increase the charge of 300MP slightly over the corresponding charge of SR4759. I have not chrongraphed these loads. I suspect that increasing the charge of 300MP slightly to 22.0 grs. may tighten up the group and bring the velocity on par with the SR4759 load.
    Last edited by oldblinddog; 05-23-2017 at 11:09 PM.

  4. #4
    Boolit Master

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    Thanks for posting the pics, with load info ! I have a .30-06 that I'm fixing to start messing with, and this helps alot.

    I would bet that the 300MP load is already going faster than the SR4759 load. If you get the chance to clock those loads, I would certainly like to see that info.
    "Varium et mutabile semper femina." - Virgil
    Man, ain't it the truth....

  5. #5
    Boolit Master
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    I have only found one burn rate chart that had 300MP on it. It was the next slower than SR4759. Of course we don't know how much slower, if any, but that would indicate why the other poster thought it needed an increase in the charge. However, I will chrony these loads later this week and then we shall know for sure what they are doing.

  6. #6
    Boolit Master
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    I have the rounds to test loaded, I was just unable to get to the range this weekend. It will have to wait until Saturday. I am out of town until then...

  7. #7
    Boolit Master Jack Stanley's Avatar
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    How does the 300MP meter , better or worse than the 4759 ?

    Jack
    Buy it cheap and stack it deep , you may need it !

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  8. #8
    Boolit Master
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    I wouldn't know that as I don't meter anything. However, in as much as 300 MP looks like Bullseye, I would bet dollars to doughnuts that it meters very well for those that do.

  9. #9
    Boolit Master
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    300MP is a very fine ball powder. I have used it in place of 4759 in a 3855 with decent results but haven't pursued it's use very far.

  10. #10
    Boolit Master


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    1/2 of the equation that made SR4759 so desirable was it's bulk. It filled larger cases to a greater degree than most other similar burning powders giving much less "powder position sensitivity". Doesn't sound like the 300MP does that?

    Larry Gibson

  11. #11
    Boolit Master
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    Quote Originally Posted by Larry Gibson View Post
    1/2 of the equation that made SR4759 so desirable was it's bulk. It filled larger cases to a greater degree than most other similar burning powders giving much less "powder position sensitivity". Doesn't sound like the 300MP does that?

    Larry Gibson
    Yes, saw it right off. It does not do that. On that it is disappointing, but in everything else it does well ( in my, so far, limited experience).
    USMC 6638

  12. #12
    Boolit Master Jack Stanley's Avatar
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    As long as it's accurate the bulk doesn't matter so much to me .

    Jack
    Buy it cheap and stack it deep , you may need it !

    Black Rifles Matter

  13. #13
    Boolit Master
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    Ok, I don't have all the data but I have some of it. I don't know what the chrony was doing but my two strings were ruined by some wildly inaccurate numbers from another rifle I shot today after these two strings with the SR4759/300MP. Not sure why they got into the strings.

    What I have is the two average velocities, going by memory. For 21.5 gr. SR4759 from the 20" barrel of my .308 Win. : 1775 fps I don't recall the SD on this but the ES was like 9.

    For 21.5 gr. 300MP : 1753 fps I do not recall the ES or SD for this but they were little more than the SR4759; the ES could have been 19 but I'm not certain.

    The rediculous velocities were 6645, 4558 and 1971 which were three shots from a paper patch .338 bullet. The only one I believe is the 1971 which was the only one that functioned correctly by shedding the patch as confetti in front of the bench. The load was 37.0 gr. IMR4895 and it went right to point of aim.
    Last edited by oldblinddog; 06-05-2017 at 12:22 AM. Reason: Corrected typo on powder name.
    USMC 6638

  14. #14
    Boolit Master

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    If those 2 velocities are accurate and the powder is not position sensitive it looks like a winner if the pictures posted are an example of what it can do in your gun. The difference in velocities are close enough to be loading error or std variation.
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  15. #15
    Boolit Bub
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    Did you use a filler with the MP300?ripshod

  16. #16
    Boolit Master
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    No filler was used.
    USMC 6638

  17. #17
    Boolit Master waco's Avatar
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    I'm pretty sure gravel meters better than SR4759. This is why I have an RCBS Charge Master 1500
    The fear of the Lord is the beginning of knowledge: but fools despise wisdom and instruction.
    Proverbs 1:7

  18. #18
    Boolit Master
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    Here are a couple of new groups. The first is .308 Win with the Lyman 311672 sized .311" and 23.0 gr. 300MP. This group is reasonably accurate, however, the cases were badly smoked with this light 163 gr (lubed and checked) bullet. Also the ES and SD were quite high. The 21.5 gr load with the 314299 did not do this, I believe because of the heavier bullet. Some may want to add a 1 gr. pinch of dacron here with the lighter bullet.
    Attachment 197744
    The second group is from the .30-06 loaded with the NOE 311332 194 gr. (lubed and checked), 25.0 gr 300MP and crimped over the scraping groove. The heavier bullet plus crimp allowed more pressure to develop.
    Attachment 197745
    Last edited by oldblinddog; 06-16-2017 at 11:49 PM.
    USMC 6638

  19. #19
    Boolit Master
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    Tried to get some more data today. I went back to the 314299 sized 0.311" in the .308 Win loaded over 22.5 gr of 300MP. I had good pressure an no dirty smoked cases as with the 311672 bullet. I fired 17 of them into one ragged 3/4" hole at 50 yds. Unfortunately with all the sunlight and Rambo on either side of me, the data was corrupted. These loads clocked about 1880 fps or so, but Rambo's muzzle blast was making about 1400 and he got in 4-5 for every one of mine. If I get the chance, I will re-shoot these later this week and post the data. For reference, see the pic above of the same bullet over 21.5 gr of SR4759. They were about the same.
    USMC 6638

  20. #20
    Boolit Master
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    Here is the data:
    Attachment 198721
    USMC 6638

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