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7mm RUM vs other mags

 
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  #1  
Old 04-16-2009, 08:51 PM
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7mm RUM vs other mags

I was plugging the 180gr Berger VLD's into a ballistic program and realized if you can launch them at 3300fps+ they absolutely outshoot anything 250gr and under in any caliber bullet.

Now for the cartridge to push it:

7mm RUM (is this the same case as the 300RUM, or would the 300RUM necked down be advantegous as in case w/ the .338 edge?)

.284 Norma Mag, based on the .338 norma case, necked down to .284, should yield roughly 97gr case capacity

7mm Allen Mag, based on the .338 Lapua case, should be very samiliar to the Norma mag, accept in long magnum format

(of coarse w/ these large sums of powder being burnt, I realize the need to a high quality 28-30" tube)

Anyone have expierence w/ these cartridges? how about highspeed 7mm barrels? the 180gr vld Berger bullets?

I know Nathan Dagley is planning on building the .284 norma, I am looking forward to that! Any HELP would be MUCH apreciated, thanks guys.
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  #2  
Old 04-16-2009, 09:10 PM
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Re: 7mm RUM vs other mags

There's also the 7mm-300 Weatherby/7mm-378 Weatherby variants. W/ 92 and 120 grains capacity respectfully, however I don't care for belted/double radius shoulder cartridges.
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Old 04-16-2009, 09:50 PM
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Re: 7mm RUM vs other mags

My 7 RUM loves the 180gr Bergers @ 3007 fps. Not the numbers your looking for, but good accuracy, low velocity spread and better barrel/brass life than running the pi$$ out of it.
If your going to play, your going to pay
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Old 04-16-2009, 10:05 PM
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Re: 7mm RUM vs other mags

What gamedog said.

"If youre gonna play, you WILL pay." That little bore with all that powder and gas shooting those long heavy bullets at near the speed of light.......Your barrel will be shot out nealy as fast

All of the RUMs are hard on barrels. The trade off is high retained energy of which the 338 RUM or EDGE using 300 SMK's is the king. More energy, better barrel life etc......

IMHO if youre set on a 7mm then a slightly smaller case may be a bit more appealing. A 7mm rem will offer good velocities with th 168-180 pills and longer life.

Guess you got to ask yourself how much you plan on shooting it.

The over bore hyper velocity magnums always look like the cats meow on paper and in the ballistic software but there are several prices to be paid to get those cool paper ballistics. Cost of powder, constantly replacing beat up brass, costs to the gun smith for setting the barrel back regularly, costs of new barrels and the cost to redevelop new loads for all those new barrels. I have played the game and payed. And payed and payed.......Now I am looking into the WSM variety. Then again, I shoot ALOT.
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Last edited by Michael Eichele; 04-16-2009 at 10:10 PM.
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Old 04-16-2009, 10:39 PM
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Re: 7mm RUM vs other mags

Thanks a lot for the info guys, I appreciate all the wisdom you have, as I am pretty new to the long range shooting scene.

Is there a limit on velocity that the 180 berger can fly? I hear the 168's start to break down past 3250-3300 depending on twist of coarse.

I would like the velocities higher, but if I can't have them, I might just have to step up to the .308 or .338 calibers, as I know the 210 smk @ 3150 hangs w/ the fast 180 7mm's.

I call BS on all of Lazzeroni's stuff, all # @ high altitudes w/ light bullets, of coarse, its a hunting round, trying to show off I guess.

Barrel life would more than likely be better on a .338/.308 weapon of this case capacity range huh?
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  #6  
Old 04-17-2009, 12:19 AM
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Re: 7mm RUM vs other mags

Yes. As the bore gets bigger, the bbl life gets better. To a point that is. 100 grain capacity case is a 100 grain capacity case. Going from a 284 to 338 wont buy you another 3000 rounds but can buy you 500. At least in the RUM cases anyway.

Dont overlook the 210 JLK and 208 AMAX. These are very high BC bullets up to par with the .284 180 grain bergers. They also deliver more energy. Guys are getting about 3200 with the 210's and 208's with the 300 RUM. Again, you will have to pay to play. Not much better barrel life over the 7mm RUM is expected here either.

Honestly, if youre just getting into this arena, start smaller. Big boomers are tempermental and expensive. They can put a sour taste in a mouth fast.

Dont get me wrong, big cases have their place and do excellent for the jobs they were designed to do but dont get caught up in bigger is better. Trust me I know how it feels to want the biggest baddest thing out there just because theyre cool and impressive. They are in fact cool and impressive but not always practical, espescially if youre somewhat new in the sport. You really need something that will work for you instead of you working for it. After you are more comfortable, then try a big boomer.

the WSM line is somewhat short of the RUM performance level but they are (IMHO) easier to load for, cheaper to operate and offer more life. You can still drive a 210 to 2800-2900 depending on the barrel. You will do it with a lot less frustration than the hyper velocity versions.
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Long range shooting is a process that ends with a result. Once you start to focus on the result (where the shot goes, how big the group is, 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.

Last edited by Michael Eichele; 04-17-2009 at 12:27 AM.
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  #7  
Old 04-17-2009, 04:01 AM
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Re: 7mm RUM vs other mags

Michael,

Wooo hoooo you're raining on my parade............ But I'm one of those power driven folks.

I shoot a 270 Allen Mag but wish I would have went with a 7mm due to the lack of 270 heavy bullets. I've shot her an extra bunch just just because. I fully expect to get a few shots over 1000 rounds through it. A 7mm smoker should exceed that amount of total shots just because it would be in someone else's hands. Once I get things settled out the rifle won't see 10 shots a year thus its life will be long.

I am treating berger bullets very harshly. The 150s won't shoot at any "reasonable" velocity in my fast twist 3 groove 30" bbl. The less the jump the smaller the group but min size is 1.5 MOA.

I'm working on a process to reduce 7mm Bergers to 277. When this is done to the 168s group size is right around 1 foot @ 50 yds. Really!. All holes are out of round to some extent. More than 90% of the holes are nearly horse shoe shaped. This is at velocities less than 3000 fps.

I suppose the same results would be achieved with the 180gr normal jacketed bullets.

The 180gr thick jacket match bullet shows good promise.

Highdrum, I'd recommend something like a 338 RUM, EDGE, or some such. Push the 300 SMK to whatever velocity you wish. Learn its drop and you're good for long range on larger animals. My carry rifle is a 338 RUM sporter weight with its range being limited only by the scope on it. To 900 yds its deadly and really fun to shoot.

But I wouldn't run away from one of the big 7s but I'm bettin you'll be short on bullet selection. One of the noted smiths here has gone the berger route and has ended up shooting 160 NABs in his. He mentioned, if I recall correctly, that he didn't notice much if any difference in jacket thickness between the regulars and the thicks.

When the Wildcat bullets gets going later this spring/summer bullets will no longer be an issue.

Nightey Night.....
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