7mm RUM Loads---actual performance

[FOTIS]

What velocity are you guys getting with 140-160 gr bullets? Any loads would be great.
I have heard/read some loaders getting 3400 fps with 150's and 3600 with 140's.

Can this be safely done?

 

[JD338]

Pop,

Here is some load data for the 7mm RUM.
http://www.handloads.org/loaddata/defau ... er&Source=

I think 3600 fps with a 140 gr might be a little optimistic but I don't know first hand. That is really smokin.

The Nosler RG#6 will also have 7mm RUM load data, should be out in Oct.

JD338

 

[FOTIS]

Jim I had a 7mm STW years ago. It was a Sendero.
140 NBT's with 80 gr of 7828 gave me 3502 fps on the nose! Accuracy was 1.25" at 300 yards---on average for Brad and I.

So with xx more grains of powder capacity of the rum....who knows?
Just never seen it "written" on a trusted source......

 

[nomosendero]

I have owned 3 diff 7RM's in the past & was really into 7mm. I know of several people who own custom 7STW's, they were really promoted by a local gunsmith. Several of these guys get velocities with the 140 in the area that POP mentioned. I do not see from reliable sources much of a gain over this with the 7RUM, I wonder if the case is a little much for a big boost with a 140 over the STW. It may start pulling away with the 160, but I feel a fast twist barrel & 200gr. Wildcats or bullets over 180gr. is where the round would start to kick butt. Just my thoughts.

 

[FOTIS]

It does pull away with the 160's. I got 3305 with the 160 AB's and retumbo.

 

[JD338]

Very impressive guys.
Should shoot flatter than road kill.

JD338

 

[honkeetonkin]

Hey Pop, I've been playing with a 7rum also useing retumbo. Stopped at 92 grs as groups were 3/8 with three shots shooting 160 partitions but without a crony I had to guess the FPS at 3100 .

 

[FOTIS]

Cartridge : 7 mm Rem Ultra Mag
Bullet : .284, 160, NOS PART SP 16327
Cartridge O.A.L. L6: 3.600 inch or 91.44 mm
Barrel Length : 26.0 inch or 660.4 mm
Powder : Hodgdon Retumbo

Predicted data by increasing and decreasing the given charge,
incremented in steps of 2.0% of nominal charge.
CAUTION: Figures exceed maximum and minimum recommended loads !

Step Fill. Charge Vel. Energy Pmax Pmuz Prop.Burnt B_Time
% % Grains fps ft.lbs psi psi % ms

-20.0 76 73.60 2667 2527 33939 12957 99.8 1.697
-18.0 78 75.44 2730 2648 36355 13170 100.0 1.654
-16.0 80 77.28 2792 2770 38947 13353 100.0 1.603
-14.0 82 79.12 2853 2892 41703 13531 100.0 1.552
-12.0 84 80.96 2913 3016 44609 13706 100.0 1.504
-10.0 86 82.80 2973 3140 47689 13877 100.0 1.458
-08.0 88 84.64 3031 3265 50956 14044 100.0 1.414
-06.0 90 86.48 3089 3391 54422 14208 100.0 1.371 ! Near Maximum !
-04.0 92 88.32 3147 3518 58100 14369 100.0 1.330 ! Near Maximum !
-02.0 94 90.16 3203 3645 62003 14525 100.0 1.291 ! Near Maximum !
+00.0 95 92.00 3259 3775 66147 14678 100.0 1.254 !DANGEROUS LOAD-DO NOT USE!
+02.0 97 93.84 3315 3905 70547 14826 100.0 1.218 !DANGEROUS LOAD-DO NOT USE!
+04.0 99 95.68 3371 4036 75224 14970 100.0 1.183 !DANGEROUS LOAD-DO NOT USE!
+06.0 101 97.52 3426 4169 80196 15110 100.0 1.150 !DANGEROUS LOAD-DO NOT USE!
+08.0 103 99.36 3480 4304 85485 15245 100.0 1.118 !DANGEROUS LOAD-DO NOT USE!
+10.0 105 101.20 3535 4440 91118 15376 100.0 1.087 !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 10% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 10% relative to nominal value:
+Ba 95 92.00 3361 4013 79568 14285 100.0 1.160 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 95 92.00 3107 3430 52423 15245 100.0 1.384

 

[JD338]

Pop,

Nosler has published load data for the 7mm RUM.
http://www.nosler.com/index.php?p=15&b=7mm&s=418

JD338

 

[FOTIS]

Still torn......

 

[JD338]

Pop,

Get them both.........

264 Win Mag in CDL for deer,

7mmRUM in a Sendero for the long stuff.

JD338

 

[FOTIS]

Nope...I already downsized. I want to stay with 3 Big game guns.

I now have the
SAKO TRGS 30-378
WBY 416 Mag MKV

and whatever "smaller" caliber for occasional coyote(rarely), and mainly deer and antelope. Hence the dilemma!

264 or 7mm rum

Sendero or sporter????????????????????????????????????????????

 

[Powerstroke]

Vote #1 for the Sendero

POP....what is the difference in a TRG & TRG(S) ?
I looked long and hard at the TRG in .338lapua Mag, but couldn't ever find one to put my hands on first.

 

[FOTIS]

I believe the TRG-S is the sporter configuration.

 

[Powerstroke]

POP,

Awesome looking gun ( after I had to look it up )
How well does it shoot? I'm sure if it's one of the rounds your keeping it shoots "very" well ??

 

[FOTIS]

POP,

Awesome looking gun ( after I had to look it up )
How well does it shoot? I'm sure if it's one of the rounds your keeping it shoots "very" well ??

Quoted from a post I made on the Wby forum.

Ok, so I just bought one of the last SAKO TRGS left in 30-378.
So I loaded her up with 200 grain Accubonds and 109 gr Retumbo.

Velocity is 3250 fps this is a 100 yard 4 shot group.

 

[Powerstroke]

POP,
That is absolutely incredible !! Nice shooting

 

[FOTIS]

Easy if the rifle is up to par.

 

[JD338]

Nice shooting Pop.

JD338