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7mm RUM Loads---actual performance

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Unread 08-05-2007, 07:51 PM
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did you ever check the rate of twist to see what it actually was?
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Unread 08-05-2007, 08:06 PM
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Its nine.
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Unread 08-06-2007, 09:22 AM
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Did some shooting this AM, calm overcast morning. Had to decide weather I wanted a single shot or repeater, this rifle has been shooting great with the bullet just of the lands. Kinda dreaded changing things plus I had to open a new lot of RL-25. Seated the bullet deeper to use the mag, gave myself .005 clearance. Should have probably another .005, but I might just go with one in the mag and one chambered. Started back at 100 and with three shots got it about 2" high, went out to 300 yds and after a sight adj shot a three shot group measuring 1.340". That's about as good as it gets for this ol' boy.
160 gr AccuBond in front of 91gr of RL-25, guess I'll stick with this load til something better comes along.
Also have a 338 RUM I doing alright with, 99gr RL-25 and 225gr ABs giving me 3150-3200 fps depending on the lot of brass Im using. Getting 1-2" groups at 300 yds I've taken this one out to 750 yds with good results. Another load using 92gr of RL-22, I'm getting 3125 fps with about the same accuracy.
Will be out to CO in Oct with a cow and bull tags. Didn't draw on deer this year. One of these RUms, maybe both will be going with me.
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Unread 08-06-2007, 10:31 AM
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You will hear some pretty impressive velocites being thrown around with the 7mm RUM. It is really dependant on barrel length and chamber design.

In average, if your shooting a factory 7mm RUM, you should see around 3450 fps for a top end load with a 140 gr bullet. THe 160 gr pills will on average allow you to get to around 3300 fps.

This is from developing loads for many factory rifles back when I had time to actually do that for customers. Anything much over this in a factory 26" barrel will result in dramatically shortened case life due to primer pocket loosening.

I have also heard many claims of extreme performance with the 7mm STW. Again, most do not list what barrel length is used and also how long their cases lasted. To my way of thinking if you can not feel the primer being seated but it does not fall out of the case, this is not safe pressures to be loading to!!!!

Also, with Wby rifles, I would be suspect of the freebore situation allowing them to be loaded to much higher chamber pressures then standard chamber rifles.

I have seen some Wby rifles with very long freebore in 7mm STW and some with standard length. BAsically these are two different rounds when handloading.

All in all, the STW should be topped out around 100 fps less then what the RUM will offer for same length barrels from what I have seen in testing both rounds.

Again, max velocity potential depends on what you accept as pressure signs. Personally, if I see an extractor marks of any significance or if the primer pocket loosens before 5 firings, the load is to hot. Thats just me. Many have no worries about only getting two firings per case which will result in much higher velocity potentials!!! Thats one way to get a 7mm STW to match a 7mm RUM but its about the only way.

Kirby Allen(50)
Kirby Allen(50)

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Home of the Allen Magnum, Allen Xpress and Allen Tactical Wildcats and the Painkiller Muzzle brakes.

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Unread 08-06-2007, 05:37 PM
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7 Rum

Dito on what kirby said.

I had a custom 7 STW bilt when thier was no brass except
8mm rem mag looking for a really flat shooter.

The rifle was bilt on a browning hi wall and had a 31'' barrel.

After extensive testing this was the results.

The highest velocity reached was 3817 with a 120gr bullet
but accuracy fell off at around 3700ft/sec.

With the 140 3538ft/sec was the best I could do but brass life
was 2 to 3 rounds at best.

Later I bough a Rem sendero in 7 STW an was only able to get
3468 ft/sec with a 140gr bullet.

I now have a 7 RUM with a 26'' barrel and factory loads produce
3543 ft/sec with a 140gr bullet.

These are real velocities using a ohler 35p chronograph at 75 o
NOTE: All these loads were to hot in the summer (Texas avg 95
to 100 o )

So be happy with a usable 3500 ft/sec load with a fac 26'' barrel.
you might be able get a little more with reloads and still be safe.

I have no data on longer barrel 7RUMs.

I hope this helps
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Unread 08-06-2007, 06:05 PM
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What is your load with the 140's at 3540?

"Weatherby was too long so I nicknamed it "Bee""
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Unread 08-06-2007, 07:23 PM
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7 Rum


It is the remingtion factory with the 140gr noz partition
(hard to find sometimes)

And forgive the spelling on the other post (must have had
a brain fart).

I havent had time to work up a hand load yet and grouping
was .519 5 shot,s @ 100yrd,s (not bad for factory loads
in a factory REM 700). standard deviation was 24 ft/sec.
not great but ok.

PS Stock is a AI walnut hunter.


Last edited by J E Custom; 08-06-2007 at 07:32 PM. Reason: Add info
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