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

 
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  #1  
Old 01-08-2010, 02:35 AM
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7mm Rem Mag or 7mm Ultra Mag???

I am looking to get a new Remington SPS Stainless rifle in either 7mm Rem Mag or 7mm Rem Ultra Mag.
I am not worried about in barrel life as I plan to use the action for a future project anyway. I plan to shoot the 180 grain Berger bullet for large game. Which calibre should I choose?
What sort of velocity could I expect from the 7mm RUM compared to the 7mm Rem Mag with this bullet?
Would the 7mm RUM need a brake?
All advice welcome
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  #2  
Old 01-08-2010, 05:54 AM
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Re: 7mm Rem Mag or 7mm Ultra Mag???

Quote:
Originally Posted by Topshot View Post
I am looking to get a new Remington SPS Stainless rifle in either 7mm Rem Mag or 7mm Rem Ultra Mag.
I am not worried about in barrel life as I plan to use the action for a future project anyway. I plan to shoot the 180 grain Berger bullet for large game.
Quote:
Excellent choice.

Which calibre should I choose?
Quote:
I would choose the 7 RUM. It all depends on how far you plan to shoot.
What sort of velocity could I expect from the 7mm RUM compared to the 7mm Rem Mag with this bullet?
Quote:
I would say 3000 for 7MM Rem Mag and 3250 for 7mm RUM

Would the 7mm RUM need a brake?
Quote:
Depends on how sencitive you're to recoil. You will always enjoy better a shooting section having a muzzle brake on it, but you can't forget those shooting ear plugs or your shooting section is over.
All advice welcome
On the comparing tables below, the red sections for velocities incicates the
velocities and distances at which you are sub-sonic.

Good Luck!

info below on windage is for a 10 mi/hr cross wind.



Please aproach all ammunition reloading with caution. Velocities implied may not be obtainable with your rifle. Always drop charges 10% from maximun loads and increment them slowly and carefully. You are the only one responsible for your actions. Thanks!
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Last edited by Eaglet; 01-08-2010 at 02:02 PM.
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Old 01-08-2010, 11:18 AM
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Re: 7mm Rem Mag or 7mm Ultra Mag???

Eaglet, That's a great chart you provided for Topshot but isn't 3000 fps a little optimistic for a 180 out of a 7 RM? I was only ever able to get about 3000 fps with a 160 gr bullet out of a 24" barrel. Maybe I'm wrong, but I'm guessing 2850 or maybe 2900 for a 180 bullet out of a 26" barrel?

Mark
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Old 01-08-2010, 01:58 PM
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Re: 7mm Rem Mag or 7mm Ultra Mag???

Quote:
Originally Posted by MontanaRifleman View Post
Eaglet, That's a great chart you provided for Topshot but isn't 3000 fps a little optimistic for a 180 out of a 7 RM? I was only ever able to get about 3000 fps with a 160 gr bullet out of a 24" barrel. Maybe I'm wrong, but I'm guessing 2850 or maybe 2900 for a 180 bullet out of a 26" barrel?
Mark
MontanaRifleman, you could be right, the value I used this time was not from experience since it's been a very long time I reloaded for two different 7mm RM and don't have any info. So I went to Reloaders Nest to find only one for the 180 berger and it called it for 3000 ft/sec; the other info I found after your post was on a writeup from Bryan Litz,
Quote:
We’ll consider the ballistics of a 7mm Remington Magnum with the heavy 180 grain Berger VLD hunting bullet at an average 3000 fps muzzle velocity, with a standard deviation of 10 fps.
I still have a gut feeling that 2900 would be better suited.
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HEBREWS 13:8
Jesus Christ the same yesterday, and to day, and for ever.

Our Lord Jesus said that as it was in the days of Noah and
also as it was in the days of Lot so it shall be in the days...
It's happening again!!! God sent to us His prophet, and His Word
to this generation and we once more are rejecting it as was prophesied!!!

---> As promised, God Sent His Prophet to us!

Last edited by Eaglet; 01-08-2010 at 05:56 PM.
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  #5  
Old 01-08-2010, 02:38 PM
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Re: 7mm Rem Mag or 7mm Ultra Mag???

Eaglet, after doing a quick search through some old threads, I have seen anywhere from 2850 in 24" barrel to 3100 in a 30" barrel for the 180's. I was using IMR4350 with my load for the 160's and no doubt some of the slower powders like Retumbo and RL25 could give better performances. So My guess would be 2900-3000 out of a 26" tube,depending on powder, barrel etc.

That being said, what really caught my attention was the MV's you used for the RM and RUM were only 250 fps diff. I figure the RUM for at least 300 fps more and up to 400 fps more depending on load etc.

Topshot, here's and old thread that might interest you.

7mm vs. 7mm ultra mag?

P.S. I agree with going with the 7 RUM, especially if you're not woried about barrel life. It is an awesome cartridge. As far as a brake goes, I shoot my 300 RUM without one. The brake thing is individual preference.... If I had a 7 RUM, it would not be braked.

Last edited by MontanaRifleman; 01-08-2010 at 02:45 PM.
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  #6  
Old 01-08-2010, 07:28 PM
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Re: 7mm Rem Mag or 7mm Ultra Mag???

Great info boys,

The 7mm RUM is looking good. Out of the Remington Factory rifles on offer, what model would you choose, keeping in mind that I will be scrapping the rifle for its action once I burn out the tube.

I fire a lot of rounds each year. I expect that it would take me about two years to burn a 7mm RUM barrel.
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Old 01-08-2010, 07:28 PM
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Re: 7mm Rem Mag or 7mm Ultra Mag???

A Remington factory tube may or may not stabilize the 180 gr VLD. I have a 7mm RUM and tried the 180 gr JLK VLD. At 100 yards I was shooting a little over a half inch. I moved out to 500 yards on a large piece of cardboard and my rounds were going all over the place, around 10-12" groups. No wind to speak of and I was using a solid rest and a 6.5-20 SF Leupold, so I think human error was minimized. I was getting 3100 fps out of my 26" barrel, maybe could have gotten more but I don't know.
The 168 gr VLD either Berger or JLK should stabilize just fine and there shouldn't be much difference in wind drift due to the higher starting velocity. Either cartridge would serve you well. The 7mm RUM does have fairly sharp recoil in a sporter weight rifle, noticeably more than the 7mm Rem Mag. Just my 2 cents.
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