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  1. #1
    JeffreyDeGraff's Avatar
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    375 Whelen Improved

    I got some 300gr PRVI RN to shoot out of my 375 Whelen Improved. Ive been using load data for 9.3x62, because they have almost exactly the same case volume ( I talked about that in another thread). My research has shown Western Big Game powder to be great with heavy bullets in the 9.3x62, so I gave it a whirl with this. I loaded up one round with 64.0gr, one with 64.5gr, and one with 65.0gr, just to look for pressure signs. 64.5 was compressed, 65,0 was very compressed, so I stopped there. I shot them at the range yesterday and had a surprisingly good group.



    I need to load some more of these up and see what kind of velocity Iím getting. Iím hoping for 2300-2400fps.


    JTD

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  2. #2
    JeffreyDeGraff's Avatar
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    Here are my two loads for the 375 whelen improved.


    Left is the 300gr PRVI RN over Western Big Game powder. I havenít shot this load over the chronograph yet, but it is very accurate. On the right is the 270gr Speer SPBT over RL15. This load is going 2515fps.


    JTD


  3. #3
    JeffreyDeGraff's Avatar
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    I started load development for my 375 Whelen Improved and the 300gr PRVI RNSP with BigGame powder. Velocity was good accuracy OK, but it would not feed reliably from the magazine. I need a shorter OAL for it to feed, but with BigGame I couldnít get the bullet any deeper because of how much powder being used (very compressed). So Iíve decided to change direction with a faster burning powder. Winchester Staball Match is between Varget anf W748 on the burn rate chart so Iím going to give it a go. Iíve got 5 rounds loaded up, one of each powder charge going up in .5gr increments, to where I feel like the max charge should be. My velocity goal for this combination is around 2400fps.



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  4. #4
    JeffreyDeGraff's Avatar
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    I was able to go shoot yesterday. With the bullet .030Ē off the lands, rounds 1,2,3 almost feed and round 4 (the last round) fed perfectly. Next outing I will try .040Ē off the lands. I didnít quite get the velocities, with staball match, that I thought I would but I didnít get any pressure signs either, so I can keep working up. 56.0gr was 2316fps. 56.5gr was 2317fps. 57.0gr was 2314fps. 57.5gr was 2329fps. And 58.0gr was 2356fps. Next time out Iím going to try 58.5 through 60.0gr and see what happens.




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  5. #5
    Flyeralan's Avatar
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    That is one sweet looking rifle!

    "Long range shooting, It's like golf, but for men"

  6. #6
    JeffreyDeGraff's Avatar
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    After this weekend Iíll let you know if itís sweet or not. Ha! Just kidding. Itís been a great rifle so far. Hoping to get the 300gr PRVI RN feeding and load developed. Then I can move on to the next bullet.


    Sent from my iPhone using Tapatalk


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