Anybody out there mess'd with the .375 RUM.

If so please share.

Thanks,

Jeff

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Originally posted by Jeff Wemmer:
Anybody out there mess'd with the .375 RUM.

If so please share.

Thanks,

Jeff

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I responded on the African Hunting Forum.

I have just aquired a Remington custom shop 700 ABG in 375 RUM, havent shot it yet. Plan to try the Barnes triple shock, and the Northfork. Will let you know what I come up with. also gonna try RL22 since I have it lying around for my other rifles.

I tried r-22, imr 7828 and imr 4350 with 270 grain bullets in a 375 ultra that I had.

95 grains of imr 4350 went 2950 fps. The others were slower.

By far the best data available in in Lyman's 48th edition, pages 275-276. Pressures and velocities are given for six bullet types/weights for start and max loads with as many as 11 different powders.

The 375 RUM has an expansion ratio mid-way between the 30-06 and the 270 Win and basically offers 270 velocities with bullets about twice as heavy as those in a 270. IMR 4350 is about in the middle of the burn rates shown, and is a good choice for a single powder for bullets weighing 235 to 300 grs in a 26 inch bbl:

Speer 235 104 grs 3239 fps 61,200 psi
Nosler 260 PAR 93.5 grs 3005 fps 60,700 psi
Barnes 270 gr X 92.5 grs 2938 fps 60,000 psi
Speer GS 285 92.0 grs 2921 fps 61,700 psi
Barnes RN solid 300 93.5 grs 2877 fps 60,700 fps

These are all VERY close to what I get in my 26 inch 375 RUM. Note that the SAAMI spec for this round is 65,000 psi, so these are fairly conservative. As an interesting aside these data show that MagPRO powder will give the same velocities without exceeding 55,000 psi using compressed loads.

The listed powders are all slow enough that those that are not compressed can get another 100 fps or so and still average around 63,000 psi but I can't imagine that a hunter would opt for more power at this level.

If the MagPRO is accurate, it is a dandy choice for African hunting where heat may arise pressures...105 grs of it will launch the 300 gr solid at 2870 fps at only 53,000 psi.

Is that information for the Magpro powder in the Lyman book? The load data on the Accurate powder website does not include Magpro.

quote:

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Originally posted by gixxer:
Is that information for the Magpro powder in the Lyman book? The load data on the Accurate powder website does not include Magpro.

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Yes, it is in the Lyman book. I plan to try some in my 375 RUM soon, once I get a muzzle brake and a heavy stock on it!

Yes, I am contemplating a mercury reducer in my stock. My rifle weighs around 9 without the scope, and my scope is 21oz, so we shall see.