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7mm RUM for Long Range

 
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  #1  
Old 01-18-2009, 09:57 PM
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7mm RUM for Long Range

First Off hello to everyone, been reading posts here for some time and decided to join.

I did a search but came up with little so I figured this was as good of a place to ask.

Do you feel the 7mm RUM is up to standards not in velocity, we all know velocity is no issue, but the fact its a bit pickey and unpredictable for reloading to make a long range hunting cartridge.

I do own 2 in 700 actions, and have seen first hand how picky they are, however i found 2 loads that suit my needs on with 160s and the other with 140s, i would not call them tac drivers. but acceptable for hunting to resonable distances

I am just looking for comments with regards to the 7mm rum, and what you found that works with this cartridge.

Thank you
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  #2  
Old 01-19-2009, 07:37 AM
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Posts: 593
Re: 7mm RUM for Long Range

Welcome to the forum!
My 7 RUM shoots 180gr Bergers very well. If your looking to strech that caliber out, I'd consider shooting heavier bullets with higher bc bullets .
You won't have the velocity, but the heavier bullets will perform better.
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Old 01-19-2009, 03:48 PM
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Re: 7mm RUM for Long Range

What makes it picky and unpredictable, never noticed that. I have loaded for at least 4 different 7RUMs and found them to be very easy to load for using about 94 plus or minus grains of Retumbo with either the 160AB, 168 berger or the 162 hornadys.
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  #4  
Old 01-19-2009, 04:48 PM
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Join Date: Dec 2008
Posts: 24
Re: 7mm RUM for Long Range

I have found i can not get them as accurate as a 7mm rem, just are not paper puncher accuracy like you see with other cartridges. I have a hard time wih them, unless I expect too much.
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  #5  
Old 01-19-2009, 05:06 PM
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Re: 7mm RUM for Long Range

i would agree with the word "picky" and i would also agree with the 180 Bergers.

what i found works with this cartridge is to make it a 338!
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  #6  
Old 01-19-2009, 10:55 PM
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Join Date: Jul 2004
Location: Texas
Posts: 5,493
Re: 7mm RUM for Long Range

Quote:
Originally Posted by JYuke View Post
First Off hello to everyone, been reading posts here for some time and decided to join.

I did a search but came up with little so I figured this was as good of a place to ask.

Do you feel the 7mm RUM is up to standards not in velocity, we all know velocity is no issue, but the fact its a bit pickey and unpredictable for reloading to make a long range hunting cartridge.

I do own 2 in 700 actions, and have seen first hand how picky they are, however i found 2 loads that suit my needs on with 160s and the other with 140s, i would not call them tac drivers. but acceptable for hunting to resonable distances

I am just looking for comments with regards to the 7mm rum, and what you found that works with this cartridge.

Thank you
The 7mm RUM is about the flattest shooting factory round on the planet and any time you
have a large overbored case you will have a somewhat finicky round .

But just like a hotrod engine it can be made to perform with some good bullet and powder
combinations.

I like to load 99 to 100% load density with all loads especialy the cases with 100+ grain
case capacities.

Also heavy long barrels work best in the big cases. The bigger the barrel normaly the less
finicky they are.

The main advantage of the big 7mm is it's ability to handel the heavest bullets better.

Lets say you want to shoot 1000 yards. the 7 Rum will push a 175gr bullet 20" flatter
than a 7 Rem mag can push a 160gr bullet an deliver 160 ft/lbs more energy .

I have a sporter weight #4 conture 7 RUM that shoots consistantly in the .400 range
and one of these days I will build one with a heavy( #7 ) 28" barrel just to see how well
it will shoot.

J E CUSTOM
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  #7  
Old 01-20-2009, 01:07 AM
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Join Date: Oct 2007
Location: Patagonia Mountains, Arizona
Posts: 756
Re: 7mm RUM vs 338 RUM at Long Range

Quote:
Originally Posted by davewilson View Post
i would agree with the word "picky" and i would also agree with the 180 Bergers.
what i found works with this cartridge is to make it a 338!

The following is a "Quickload" comparison of a 338 RUM vs a 7mm Rum, both with 30" barrels, both with ~90% SAAMI max pressure using available powders picked for high velocity. In this example "long range" is 2000 yards.

cartridge 7mm RUM 338 RUM
Bullet 180 Berger 300 SMK
Powder H870 91.8gn Retumbo 96gn
Muz V 3170 fps 2725 fps
2k V 1117 fps 1044 fps
2k E 494 ft-lb 726 ft-lb
2k drop 1568 inch 2033 inch
2k wind 25.1 in/mph 27.1 in/mph
2k TOF 3.32 sec 3.74 sec

At some distance a higher BC projectile will have a flatter trajectory than one with a lower BC independent of initial muzzle velocity (within reason) . In the case of the 7mm RUM and 338 RUM however that distance occurs when both projecties are subssonic. The 338 needs more case capacity or higher pressure to equal the supersonic trajectory of the 7mm RUM than the 338 RUM case can provide.

The 7mm RUM offers a flatter trajectory, a little lower wind deflection, and most noticably less recoil. The 338 RUM offers more delivered energy, larger holes, and longer barrel life.
I woudn't bet on either to give best accuracy. on a given day. That would depend on a lot of factors incuding the atmospheric conditions even if the rifles and bullets were perfect.

I don't own a 7mm RUM but I have a 7mm STW which shoots 180 Bergers and 338 RUM which shoots 300 SMKs. I built both for 1 mile silhouette and they are similar in design and weight. (Rem 700's, 29 & 28" barrel, HS stocks, no brakes. The 7mm STW is much easier to shoot because of lower recoil and typically gives better accuracy (for me). The 7mm STW case has less capacity than the 7mm RUM but it still gives a lower time of flight and flatter trajectory than the 338 RUM.

Last edited by LouBoyd; 01-20-2009 at 01:12 AM.
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