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.300 Ultra Mag vs. 7mm Ultra Mag

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Unread 02-20-2006, 05:07 PM
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Join Date: Feb 2005
Posts: 628
Re: .300 Ultra Mag vs. 7mm Ultra Mag

you need to make sure you are comparing bullets with a similar b.c. thats were you differences are coming from. from 0-600 yards sheer velocity will win, but from 600 on the b.c of the bullet will win the race every time for same starting velocitys.

I too would recomend the 300 over the 7mm just because there are so many more good quality longrange bullets for it. I have never liked limiting myself to a few bullet choices.

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Unread 02-20-2006, 05:18 PM
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Join Date: Jan 2003
Location: The rifle range, or archery range or behind the computer in Alaska
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Re: .300 Ultra Mag vs. 7mm Ultra Mag

I have they are pretty close from 0 to 400 yards with the 300 RUM having the upper hand, but once you go past 400 yards the 300 RUM drops more and more in fps and energy and the 7mm RUM starts to really shine.

[/ QUOTE ]

On paper yes the 7 always wins past certain yardages. In the real world sometimes it isnt quite as simple.

PLEASE understand, I am not dogging the 7mm RUM or any 7mm. Both the 7 RUM and the 300 RUM have outstanding qualities.

Take for example one of my awesome loads for the 300 RUM, a scorcher of a deer and varmint load. Its a 178 AMAX on top of 93.0 grains of RL-25. Velocity is 3450 FPS using bullets coated in tungsten disulfide. Published BC is .495
Plug all those numbers into a ballistic calculator it wikll tell you this:

The bullet in standard air will drop 186" at 1K from a 300 yard zero with 1131 FPE remaining.

The 7 mm RUM with a 162Grain AMAX at 3450 FPS (thats generous) with a published BC of .625 will drop (according to a calculator) 160" with 1433 FPE remaining. Ready for the catch?

In real world experiments and tests my 300 RUM launching the 178 AMAX at not 3450 but 3100 FPS kicks the living crap out of the 7mm RUM.

Here are the results:

88' ASL
26 degrees F.
29.61 in HG.
77% RH.

-169" 1826 FPE remaining.

If I were to use me next load up (same bullet at 3300 FPS) the calculator would say:
-147" 2117 FPE remaining.

Will the AMAX in 7mm do the same? I have no idea. Like I said, I am not here to dog the 7mm's just that I belive the 300 does better than alot of folks give it credit for. I am simply pointing out that the 300 RUM can be a MAJOR contender for those LOOOONG shots with a bigger bullet to boot.

Bottom line, choose the one that makes you feel good all over. You cant go wrong with either.
Long range shooting is a process that ends with a result. Once you start to focus on the result (how bad your last shot was, how big the group is going to be, what your buck will score, what your match score is, what place you are in...) then you loose the capacity to focus on the process.
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Unread 02-21-2006, 07:27 AM
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Join Date: Jun 2003
Location: Hermiston, Oregon
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Re: .300 Ultra Mag vs. 7mm Ultra Mag

The only thing the 7 RUM might win in is retained velocity and less trajectory. However, I'll try a little ballistics comparison for ya. Shooting the 210g VLD at 3100fps with a BC of .640 you will have somewhere around these numbers at 1000 yards. 1494lbs energy, 1790fps, 54.5 inches of wind drift with 10 MPH, and zero at 200 yards, the drop is -219. Now for the 7 RUM and the 162g AMAX. 1405lbs energy, 1976fps, 49.1 wind drift, and -181 with 200 yard zero. Damn, why didn't I get the 7 RUM??? Considering you can get 3400fps with the 162g AMAX. Those numbers beat the pants off the 300 RUM in velocity retained and trajectory. HOwever, trajectory is a moot point with come up clicks. the 7 RUM also beats the wind by 5 inches, again not much, but hey, the only advantage I see is the 300 RUM beats it by about 90 lbs of energy which is not even a .22 LR. You cant go wrong with either though, both are outstanding LR calibers.
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Unread 02-21-2006, 08:24 AM
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Join Date: Feb 2006
Posts: 76
Re: .300 Ultra Mag vs. 7mm Ultra Mag

Thanks for everybody's help. After plugging some more numbers last night and after realizing that there are more bullet choices for the 300 RUM, I am leaning that way. I was kinda leaning that that way anyway due to the fact that I am a big 300 Win Mag fan, but I was wondering if the 7mm RUM was as good as the numbers showed.

Again thanks for all your help. [img]/ubbthreads/images/graemlins/grin.gif[/img]
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Unread 02-21-2006, 11:54 AM
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Join Date: Jun 2007
Location: Wilmington NC
Posts: 4,690
Re: .300 Ultra Mag vs. 7mm Ultra Mag

Not really sure comparing a 7mm 162 vs a 30 cal 210 VLD is a good comparison.

The 210 VLD and 240 SMK are the top bullets BC wise for the 30 cal, while the 162 in 7mm is no where near tops in 7mm.

If we go to the 7mm, look at the Sierra 175 SMK and the 180 gr 7mms.

If you will do that, think you will find that the 7mm has a lot of advantage except in pure bullet mass and KE.

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Unread 02-21-2006, 01:52 PM
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Join Date: Dec 2002
Location: Northern Michigan
Posts: 1,014
Re: .300 Ultra Mag vs. 7mm Ultra Mag

Don't forget the 7mm 200gn Wildcat RBBT. If you run this bullet at 3100 fps with a B.C. of anywhere between .64 and up its rather astounding.
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Unread 02-21-2006, 03:11 PM
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Join Date: Feb 2004
Location: Pennsyltucky
Posts: 2,630
Re: .300 Ultra Mag vs. 7mm Ultra Mag

Mag,i don't know where you're getting 3100 from a 7UM, but shooting the most accurate loads from mine, the 180 bergers will arive at 1k faster than the 200 wildcats.
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