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Thread: Swift Data?

  1. #1
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    Wink Swift Data?

    Anyone have any data for a 375 Rum with 270 grain Swift a frame bullets? I would like to use H 4350 powder, and the manuals I have use IMR 4350. What Powder does Swift recomend in their manual? Thanks Bill
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    Default The BIG 375...

    I have loaded this one with H4350. This has been my most accurate powder for it but RL-22 was the highest velocity with the 270 A-frames.

    90.0-95.0 grains of H4350 and the 270 A-frame is what works. 95.0 grains gives about 2900 fps. My test rifle for this one was a Bill Wiseman rifle made on a Sako action and one of his effective but hideously noisy brakes and it never moved off the bench when shooting. I shot many one inch groups with this rifle at two hundred yards.

    This bullet when loaded with 105.0 grains of RL-22 will give 3000 fps from this 24" barrel.

    The best field performance from this slayer is with the 300 Swift A-frame and 97.0 grains of RL-22 for 2800 fps. Enjoy.
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    Question power

    I am reloading for a 350 Griffin & Howe and was wondering how the H4350 would work for it and if so how many grains would you start out with. I am using IMR 4350 right now and found that 72 gr produces very good groups. I would just like to try some other powders and have also thought about trying RL-15. What do ya'll think. Thanks

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    Default

    Quote Originally Posted by 450HUNTER View Post
    I am reloading for a 350 Griffin & Howe and was wondering how the H4350 would work for it and if so how many grains would you start out with. I am using IMR 4350 right now and found that 72 gr produces very good groups. I would just like to try some other powders and have also thought about trying RL-15. What do ya'll think. Thanks
    I would think a little slower powder would be better more likely RL-19 with this 35 bore. The rule is smaller bore= slower powder with same case size. Isn't your G&H an improved case with more shoulder?
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  5. #5
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    Default

    Quote Originally Posted by 450HUNTER View Post
    I am reloading for a 350 Griffin & Howe and was wondering how the H4350 would work for it and if so how many grains would you start out with. I am using IMR 4350 right now and found that 72 gr produces very good groups. I would just like to try some other powders and have also thought about trying RL-15. What do ya'll think. Thanks
    In my 350 Rigby I used both H4350 and Varget, and found that I had better accuracy with Varget. The Rigby is slightly smaller in capacity than the 350 G&H. I found both 66 gr Varget and 71 gr H4350 produced 2700 fps with 250 gr bullets, but Varget groups were sub moa, and H4350 was 1 1/4" to 1 1/2" for 3 shot groups.

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    Murphy
    I have been necking down 375 H&H brass but I just purchased some 350 Griffin & Howe brass from Quality Cartridges. The brass was not cheap either but you have to pay to play sometimes. What grain would you suggest to start with for the RL-19?

    Paul H
    What grain would you suggest starting with the Varget? I have been using IMR 4350 and found 72 gr to do pretty could but I would like to try some other powders.

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    Default

    At this charge level it will take about 4.0 grains more RL-19 to equal the velocity/pressure of the IMR-4350 load. Start with the RL-19 where you stop with IMR-4350. The 72.0 grains is a good starting point and up to about 75.0 or 76.0 grains of RL-19, with the same bullet. RL-15 would use about 4 grains less than 4350 and Varget would be about 2.0 grain less than RL-15. This is just extrapolation, I haven't loaded with the Varget much. Paul can speak to that issue.

    The G&H case will hold a little more powder than the 350 Rigby case, about equal the 358 STA, If you have a manual that list the the STA you could use reduced data from that....this would be a fun round to experiment with.
    Is there nothing so sacred on this earth that you aren't willing to kill or die for?



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