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375 RUM with 350gr MK

 
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  #1  
Old 04-24-2011, 12:31 PM
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Join Date: Jul 2008
Location: Clearwood, WA
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375 RUM with 350gr MK

Has anybody tried the 350gr MatchKing in the 375 RUM? I have this urge to put together a heavy long range 375, but I don't really want to deal with the CheyTac case or action sizes. The RUM seemed like a decent option. I'm not sure how fast this case can move a bullet that heavy, but I'm expecting somewhere around 2700 fps.

I ordered a box of the 350gr Sierras and some 375 RUM brass so that I could put together a few dummy rounds as inspiration. Those should be here in a few days. I'm not sure what the OAL will be, so I don't know what action I would need to use in order to have a repeater. I'm not really worried about that though.

Andrew
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  #2  
Old 04-24-2011, 05:35 PM
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Location: New Zealand
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Re: 375 RUM with 350gr MK

Cutting edge 320gr BC.830 might be worth a look as well
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  #3  
Old 04-25-2011, 09:24 AM
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Join Date: Dec 2005
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Re: 375 RUM with 350gr MK

You might call/email Sierra and ask what twist is best for that long, heavy bullet at the speed you'll want to shoot it. A 10 or 11 inch twist may be what it needs.
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Old 05-23-2012, 09:27 AM
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Re: 375 RUM with 350gr MK

i have a 338 edge now and i was thinking the same thing that the 375RUM with the 350 would be good long range i would have the throught cut deep so i could seat the bullet out . my action and stk is set up for single feed. When your shooting past 500 yds if you miss usily the criter you are shooting at just stands there and lets you try agin so a fast reload was not an issue for me . buy the way my edge is for sale.
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Old 02-12-2014, 07:20 PM
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Join Date: Apr 2012
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Re: 375 RUM with 350gr MK

I have sold my 338 edge and built a 375 rum with a 32 in barrel and I put a JP recoil eliminater on
Loads so far are 350 smk with 87grs imr 7828 and 91grs RL25 both shot about 1/2moa with RL25 being a bit tighter now time to put them over the crony. Ihave no pressure signs and expect to get arond 2800 fps with the long barrel that will get the 350 smk with a BC of .800 the same trijectory as my 300 mag shooting 178 a Max at 3150fps out to 1000 yds
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  #6  
Old 02-12-2014, 09:35 PM
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Join Date: Jul 2008
Location: Clearwood, WA
Posts: 110
Re: 375 RUM with 350gr MK

Since that post I built a 375 RUM/404 improved to shoot the 350gr MK. I ended up with the 350s at 3050fps from a 30" barrel. I'm pretty happy with how it turned out but I really don't shoot it much. I end up shooting the Striker in 284 Win more. Go figure!

Here's a picture of a standard 375 RUM next to my improved version and my 375 next to a 404 case.



Andrew
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  #7  
Old 02-13-2014, 12:02 AM
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Join Date: Apr 2012
Posts: 49
Re: 375 RUM with 350gr MK

Is that what they call the box monkey? And what is your load I might rent a reamer and ream it out some but maybe ill leave it alone if I can get 2800 it will do what I want. My 338 edge pushed the 300 over 3100 and I backed it down to save on brass so I'm only 50 gr heveyer so ill se when aether gets better ill get more time at the range it is hard to find load data on the combo so I'm going from what I can find to start
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