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7mm RUM vs other mags

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Unread 02-18-2010, 11:06 PM
Join Date: Nov 2007
Location: Kookifornia
Posts: 730
Re: 7mm RUM vs other mags

Originally Posted by Kiwi Nate View Post
I run the 180gr VLD at 3184fps in my 7mmRUM. You can kiss the barrel a slow goodbye after 150-300 rounds as the throat wanders off down the bore- fully worn out at around (accuracy wise) 600 rounds if long range precision is your game. I will be lucky if I keep this current barrel past 400 rounds, will just have to wait and see how it wears. Have a look at the 7mm-.300 Win mag thread if you want a low recoiling flat shooter that won't turn you sour. Otherwise, as others have suggested, you will need to go up in caliber. A super flat trajectory really isn't that big of a deal anyway, not with modern software. It's the shooter's ability to understand the wind that is the biggest challenge.
WOW! Thats crazy, I thought it'd make it to at least 1000 rounds...
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Unread 02-19-2010, 03:31 AM
Silver Member
Join Date: May 2007
Location: Taranaki New Zealand
Posts: 186
Re: 7mm RUM vs other mags

Yeah, crazy allright- and thats with a very tough steel on a custom barrel. I chewed out the throat on a lightweight SPS 7mmRUM over Christmas, 200 rounds, goodbye throat, worn in and worn out in three weeks.

Later in the year, if I can afford to rebarrel, I will cut these barrels in half lengthways and post some macro pics of how ugly thjings can get in a 7mm RUM bore.
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Unread 02-19-2010, 09:32 AM
Platinum Member
Join Date: Jul 2004
Location: Texas
Posts: 7,194
Re: 7mm RUM vs other mags


There are many calibers that will wash out the barrels faster than others and the 7 RUM
is one of them. So if you wan't to shoot F class matches I would not recomend it or some
others because with practise and 60+ shot matches it won't last very long. If you want to
hunt only with it you can get many years out of it.

It is a very flat shooting round and currently the contender for title of the flattest shooting
factory cartrige available.

But there is a few things that can help extend the barrel life on any rifle and I can vouch for
it because I have tried to make my barrels last as long as possible not so much from a cost
standpoint but when you have an accurate rifle you wan't to make it last as long as you can.

I like to pull a bore snake through the barrel every time I shoot it if possible this sweeps out
all of the unburned powder and loose carbon that can/will ware the bore faster when you
fire the next round on top of it, (If you want to see just how much is there from just one shot
fire one round through a clean barrel and then push a dry patch through the bore and look
at it you will be amazed at how much trash is there.

When hunting I carry a bore snake with me for this (Easier that a cleaning rod) and after the shot it is easy and fast and the rifle is ready for the next shot.

Throat erosion is another problem and can be improved some by different types and brands
of powders, cooling time between shot (If Possible), Stainless barrels will normally hold up
better (More ware resistant than chrome Molly) and Lead angle of the lands at the throat
The reamer makers have a good take on this and will recomend the best angle for your use.

The 264 win mag became notorious for this but most were hunting rifles and have lasted a
long time with no more rounds than hunters put through them in a year of hunting (5 to 10).

I lerned of the advantages of the cleaning/sweeping from a good friend that had fired an
estamated 1500 to 1600 rounds through a 7mm STW and had not lost any of it accuracy.

I have a 7mm RUM and plan of using it for hunting only so I am not concerned about barrel
life. And I practice what I preach (clean after each shot if possible).

All over bored cartriges are bad on barrels but as long as you are aware of this buy what you
want and don't look back. But if you plan on shooting a lot of rounds weekly/monthly
then there are better choices. Something allong the lines of a 280 rem.

The best caliber for you is the one you want as long as you understand there is no free

Just some comments and opinions that may help.

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Unread 02-19-2010, 10:39 AM
Bronze Member
Join Date: Nov 2008
Posts: 59
Re: 7mm RUM vs other mags

Thanks guys! I may just go with a 7mm STW or 7mm Roy as they aren't slouches either. But should offer much better barrel life.
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Unread 02-19-2010, 02:19 PM
Silver Member
Join Date: May 2007
Location: Taranaki New Zealand
Posts: 186
Re: 7mm RUM vs other mags

Dry pull between every shot is a good idea.

Yes, have to admit, one of my greater problems is that I use the RUM every week. It is also expected to fire three rounds in quick succession which is hard on the throat.

If I fired 10-15 rounds a year from it, it would last forever. On the other hand, if I only fired 10-15 rounds with it a year, I wouldn't get to learn how it shoots in our winds.

Last edited by Kiwi Nate; 02-19-2010 at 02:51 PM.
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Unread 02-19-2010, 05:37 PM
Gold Member
Join Date: Dec 2002
Location: mathias wv
Posts: 987
Re: 7mm RUM vs other mags

Well I'm not here to call anyone out, but some of these posts are just not what I have saw from my 7mm AM. It has around 460 rounds downrange, all were 160 nosler accubonds at 3500-3575 fps. each loading the MV goes up 25 fps as (I guess) the brass hardens. at 3575 fps I anneal and its back to 3500.
I've only shot ball powders, my barrel has never been hot. I have a 4 groove, 9 twist 30" lilja.
My original load for the accubonds was jammed .006" into the lands and I did on occasion pull a bullet while unloading a live round, after 460 rounds I still occasionaly pull a bullet unloading a live round, now how bad can my throat be eroded? I shoot 30-50 rounds a year through this rifle besides what I use during hunting season, I've used it 3 seasons took 26 deer with it, how many more do you think its good for?
These are the reasons I can't except the "burnt the throat out in a weekend" responses, I don't think its possible unless you do it intensionaly.

BTW my 7mm AM cases have 122 gr capacity of H2o
Born to Hunt, Forced to Work!
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Unread 02-20-2010, 02:21 AM
Silver Member
Join Date: May 2007
Location: Taranaki New Zealand
Posts: 186
Re: 7mm RUM vs other mags

Thats why I want to get the barrels off these rifles and cut them in half with an angle grinder, so I can substantiate what has been seen through bore scopes - with macro photos.

I don't have much choice over how cool the barrel stays during shoots as the rifle is often used by my hunting clients. Its not uncommon for clients to fire 3 shots in quick succession. The long range rifle is available week in, week out as we don't have set hunting seasons here.

The other problem as stated earlier, is that I have to practice a lot to understand how the wind changes from valley to valley here. Last night, I was shooting at 735 yards, down the length of a valley with a 15mph left to right crosswind. I dialed for 15mph but missed the target. I set the scope for zero wind and hit the target. When I went down to the target, a massive right to left draught was coming down a side valley (evening cooling etc). The big steep valleys here are always a challenge like this. I tend to avoid using the cheaper .308 for LR practice as it ends up several yards off target, I can't see the bullet strike and am left wondering what the heck is going on. Hence why I would rather practice with the rifle that is going to be used for the long shots anyway.

In a slightly different situation three weeks ago, I had a client here for a pig hunt. He spied a pig at 350 yards and being of an age where his joints would not allow him to climb down the ridge and get closer, he took the shot- and hit it in the backside. The poor pig took off at a hundred mile an hour, down the valley. I had three choices, either leave the clients behind and take off with the dog after the pig, take the clients back to the hut, then come back, go to the landrover and get the RUM.

The pig re-appeared again, way down the valley, still trotting along, the client had given up and was looking quite dejected. I went to the Land Rover, grabbed the gun, ammo, put the drop chart in my mouth. Ran back to the ridge edge, lay down, range 604 yards, angle must be 15-20 degrees-I better leave off a click and be sure not to aim above the center line, wind is about 5mph, ohh, better avoid the front roasts otherwise the client will have no meat left at all, aim, fire- job done.

Thats when all the practice pays off for me, being able to get a shot off quick on a non stationary target at long range, no mucking about.

Hope that explains my situation a bit better.

I am getting close to 400 rounds with this rifle which is a testament to the custom barrel. Whether it makes it to 600 rounds, who knows.

If you have the time to let the barrel cool between shots and only fire a handful of shots per year, thats great. You are still under the 600 round mark so it will be interesting to see how it lasts. The Bore snake idea sounds very useful.
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