Let's Talk About The 458 B&M

Discussion in '.375 & Up' started by TOBY458, Feb 13, 2019.

  1. Brian

    Brian AH Veteran

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    I used the CEB Raptor .500 calibre 410 grain on three cape buffalo last year. All middle of the shoulder shots ( not in the heart) at 40 yds. and all dead right there.
    The muzzle velocity from my old single shot was just 1920 fps. That CEB Raptor in 500. cal. is amazing. Brian
     
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  2. Milehighshooter

    Milehighshooter AH Enthusiast

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    Horrible influence, but great company for a few hours and many cups of coffee!
     
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  3. Milehighshooter

    Milehighshooter AH Enthusiast

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    Go even bigger. Turn that M70 into a 458 AccRel. Basically a 458 Ruger. Capacity of the Lott, length if the Win Mag. Chop it at 20" and you're about 1.5" overall longer vs the B&M and maybe a pound heavier
     
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  4. TOBY458

    TOBY458 AH Elite

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    The goal is lighter and shorter! I'm satisfied with a 450 Grain bullet at 2200fps or so. I think the 458WM should be all that's needed for that. I think a 458 WM with a 22" barrel that came in at 8.5-9lbs with a scope installed would be just about right.
     

  5. michael458

    michael458 AH Member

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    Toby....... If you do anything with that M70 you have, do 458 Winchester. I believe I recall it being 7mm Remington? If so, you do not want to go with a fatter case than what the magazine box is designed to work with, you will have endless issues with it retaining and feeding properly. You cannot successfully put a fat case in those M70s that are designed for that H&H based case, not without tons of work, and even then there are no 100% guarantees. Even with 458 Winchester there will be a few issues, but those can be sorted out. The mag box currently is set up to run those rat bullets designed in 7mm. Now you are putting a 450 gr + bullet in the nose, and the bolt dragging back over that doing it's best to snatch it out of the magazine on its way to the rear. The nose wants to come out of the magazine at that point, and some adjustments will have to be done to account for that. Its a fine line when it comes to feed/function, and you do not want to have a DGR that does not work properly, there would be no point in that..........

    Brian and I at SSK looked at trying the HHBased M70s to build 500 MDM on, since the source of Winchester M70s in 300 RUM is very limited. It was a no go, Winchester did a hell of a lot of modifications to the RUM actions to get that fatter case to feed and function in a M70. Way more than is worth messing with and still most likely not going to get the results you want or desire in a DGR. This was confirmed by a few other gunsmiths as well. While the source of Win RUM based actions is short and few, and drying up, I had Montana do two actions for me designed for RUM, and they served the purpose extremely well, even building a Left Hand action, and hence a Left Hand 500 MDM for a good friend of mine. The Montana action did very well and when the source of Win M70 RUM actions completely dry up, then Montana can take the place of those.................
     
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  6. TOBY458

    TOBY458 AH Elite

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    Yes. I spoke with JD Jones awhile back about converting that rifle to 416 Ruger, and he told me the very same thing. I then asked about 416 Taylor, and he seemed to think it would work. I've played around with some 416 Taylor Dummy rounds and they work fine every time as long as a pointed bullet is used, but sometimes a round nosed bullet will jam coming off the left side of the rails. I tried 458 Win Mag and it does the same thing. Perfect off the right side and jams on the left. I'm wondering if a 458 win mag follower would help? It has some indentations in the follower that could possibly let the cartridge ride up the ramp at a different angle. What are your thoughts on this?
     

  7. michael458

    michael458 AH Member

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    First, I am assuming the gun you want to convert is a Control Feed gun.......... If so, Brian at SSK can sort the left side out pretty easy, some minor adjustments should do it, and yes, a different follower might just do the trick the easy way...... Something Brian can sort out for you I am sure.

    Sure, 416 Taylor being nothing but 458 squeezed down to 416, same case...... Same H&H Beginnings...... would work. I had a 416 Taylor many many years ago....... 458 is the way to play.
     
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  8. TOBY458

    TOBY458 AH Elite

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    Thanks Michael. I may go ahead and order a follower and try to work it out before I send it over. Yes it is a control round feed action. The rounds that come off the right side are as slick as you could ask for. The one that comes off the left will bind with the cartridge rim wedged between the round under it and the mag box. I think maybe if a 458 follower is used, maybe it will allow the round under it to sit at a different angle. The followers are $25.00, so it won't be too costly to experiment.
     

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