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7mm Rem Mag or 7mm Ultra Mag???

 
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  #15  
Old 01-10-2010, 08:53 AM
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Re: 7mm Rem Mag or 7mm Ultra Mag???

I have had a 7 RM for 20 years now. I'm on my second barrel now. Its a Hart with a 10 twist and it shoots the 180 JLK or Bergers just fine in the 2900 range with excellent groups. I could probably get more velocity out of it but it shoots too good to mess with. At the velocity the RUM will get, a 9.5 or 9.25 twist will work just fine. There are some benchrest shooters getting 2900+ with a .284 Win and 30" barrels.

When I rebarreled I almost went with the 7 RUM but I like to shoot too much and was worried about burning it out too quickly. The numbers look good for the RUM but the longest shoot I could have were I hunt is 700 yards and there really is not a huge advantage at that range. I would rather have the barrel life to practice more!!
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  #16  
Old 01-10-2010, 12:53 PM
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Re: 7mm Rem Mag or 7mm Ultra Mag???

Quote:
Quote:
Originally Posted by Topshot View Post
The 7mm RUM is just such an impressive beast, I'm just gunna have to get one and run it in tandem with the .338 Edge and find out how impressive.
If you put 180 VLD @3300 fps next to a 300 SMK @ 2850 fps, the 180 will beat the 300 in drop, down range velocity, TOF, and windage, but the 300 crushes the 180 in energy and momentum. The 180 get to past 1150 yds with 1800 fps vel @ 1000' altitude, while the SMK gets to 975.
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  #17  
Old 01-10-2010, 07:27 PM
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Re: 7mm Rem Mag or 7mm Ultra Mag???

Quote:
Originally Posted by linksmechanic View Post
I get 3000 fps with a berger 180 with retumbo out of a sendero sf11 7rm. I hope I get more than 3100 with my rum.
If a 26" barrel limits the 7mm RUM to only 100 to 150 fps more than a 7mmRM then there is not a lot of advantage.

Maybe I would be better off getting a 7mm Rem Mag first, shoot a few Big Sambar with it, at up to say 500 yards and see how the 180 grain Bergers work on them. Then If I am happy with the performance of the Berger bullets at that range, I can then rebarrel later on to 7mm RUM with a longer barrel and extend my range knowing that bullet performance will not be an issue and I can also get the higher velocity available via a longer barrel.

What do you think of this logic?
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  #18  
Old 01-10-2010, 08:56 PM
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Re: 7mm Rem Mag or 7mm Ultra Mag???

Quote:
Quote:
Originally Posted by Topshot View Post
If a 26" barrel limits the 7mm RUM to only 100 to 150 fps more than a 7mmRM then there is not a lot of advantage.

Maybe I would be better off getting a 7mm Rem Mag first, shoot a few Big Sambar with it, at up to say 500 yards and see how the 180 grain Bergers work on them. Then If I am happy with the performance of the Berger bullets at that range, I can then rebarrel later on to 7mm RUM with a longer barrel and extend my range knowing that bullet performance will not be an issue and I can also get the higher velocity available via a longer barrel.

What do you think of this logic?
Topshot,

3000 fps is upper end velocity for a 7RM shooting 180 VLDs and it's coming out of a 30" barrel. The RUM will get you at least 300 fps more (maybe close to 400) than the RM out of the same legnth barrel with a good powder. In a 160 bullet it will almost definitely get you 400 fps more out of a 26" tube - 3050 vs 3450 on average.

Cheers
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  #19  
Old 02-08-2013, 05:15 AM
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Re: 7mm Rem Mag or 7mm Ultra Mag???

What diferens is there in velocity/altitude - I shot at 0 to 2000 feet. I see most of you seem to be at 4000 +??
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  #20  
Old 02-08-2013, 01:17 PM
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Re: 7mm Rem Mag or 7mm Ultra Mag???

You can use a ballistic calculator to find that out.

Here's a couple I use for quick reference.

JBM - Calculations - Trajectory

External Ballistics Calculator
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  #21  
Old 05-12-2013, 09:42 AM
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Re: 7mm Rem Mag or 7mm Ultra Mag???

1. Bullet placement.

2. You will shoot better with less recoil.

3. A elk on 1000 yards make no different with a central lung shot.

4. Go for the 7mm rem.mag and put attention to the load/bullet.

The 7mm rem.mag is maybe a little bit boring, its the same feeling when you like to get that new Chevy when you drive the old model.. But remeber that this is the ammuntion and rifle idustry way to make money, get new products out on the market and keep the cash flow !

Even the bullet industry is keepeing new slogans on some new bullets, but its the same old core bound stuff like 15 years ago !

Also you will have problem to get a proper feeding with the short bulky mags regarding the 7 mm WSM, if you using a drop box mag.

Good luck, Michael

Kamchatka Moose 725 yards (7mm Rem.Mag)
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