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7mm Remington Short Action Ultra Magnum

History


The 7mm SAUM was released in 2002 based on a shortened version of Remington's Ultra magnum case which is in turn based on the 404 Jeffery’s case. The SAUM was designed to produce 7mm Remington Magnum performance from a much smaller cartridge case and more compact rifle configuration.

In 2002, the same year as the introduction of the 7mm SAUM, Winchester released their own short magnum, the 7mm WSM. The two competing cartridges were presented to the market but only one survived - the 7mm WSM. Not only was the WSM more popular with hunters, the cartridge was soon adopted by several rifle manufacturers, ensuring its continuation.

Case capacity of the SAUM is slightly less than the WSM, as is the factory COAL. Remington adopted these dimensions to enable their short magnum cartridges to fit into the compact Model 7 action. Factory barrel length of the Model 7 is 22" as opposed to Winchester's short magnum barrels at 24”.

The 7mm SAUM currently retains a small following. This cartridge, chambered in the model 7 rifle, is appreciated for its ability to produce high power from a small, ultra-light weight platform.
 

Performance


The 7mm SAUM does not achieve 7mm Remington Magnum velocities or performance. This cartridge duplicates the velocities of the .280 Remington.
 

Factory Ammunition


Remington loads include the 140 grain Core-Lokt Ultra at 3175fps, the 150 grain Core-Lokt at 3110fps and the 160 grain Core-Lokt Ultra at 2960fps. However, these velocities are taken from a 24" test barrel. Actual velocities in tested Model 7 rifles average around 3150fps with the 140 grain load, 2950fps with the 150 grain and 2850fps with the 160 grain load. 

The 140 and 160 grain Core-Lokt ultra bullets produce similar terminal performance to other core bonded designs, delivering high shock and wide wounding at impact velocities above 2600fps and clean but often delayed killing as velocities approach 2400fps. At lower velocities, kills can be very slow. Unfortunately, the Core-Lokt Ultra bullets have very low BC’s of .409 and .414 and even the faster 140 grain bullet is down to 2600fps at just 225 yards. 

The standard 150 grain Core-Lokt is an excellent performer on lighter medium game out to 200 yards. Beyond this range, as velocity falls below 2400fps, kills can be very slow due to narrow wounding.
 

Hand Loading


The most suitable powders for hand loading the 7mm SAUM are those in the 4831, N165 range. Achievable velocities duplicate factory loads including 3150fps with 140 grain bullets, 2950fps with 150 grain bullets and 2850fps with 160-162 grain bullets.

References to bullet performance can be found in the .280 text of which the 7mmSAUM performs very similarly.
 

Closing Comments


The differences between the 7mm SAUM and 7mm WSM in factory ammunition or hand loads average about 75fps in favor of the Winchester which is mostly relevant to the Winchester’s 2” longer barrel. However it is perhaps moot to draw comparisons between the two because the design concept behind the 7mm SAUM Remington is to offer an effective medium game hunting cartridge in an extremely efficient carbine for hunters who require the minimum of bulk and weight. 
 
Suggested loads: 7mm SAUM Barrel length: 22"
No ID   Sectional Density Ballistic Coefficient Observed  MV Fps ME
Ft-lb’s
1 FL Rem 140gr Corelokt .238 .409 3150 3084
2 HL 139gr SST/IB/AB .246 .486 3150 3062
3 HL 154gr SST/IB .273 .525 2900 2875
4 HL 160gr Partition .283 .475 2850 2885
5 HL 162gr A-Max .287 .625 2850 2921
 
 
Suggested sight settings and bullet paths           
1 Yards 100 160 287 327 350 375 400 425
  Bt. path +3 +3.8 0 -3 -5.1 -7.8 -11 -14.5
2 Yards 100 165 294 335 350 375 400 425
  Bt. path +3 +3.9 0 -3 -4.3 -6.8 -9.7 12.9
3 Yards 100 150 265 305 325 350 375 400
  Bt. path +3 +3.6 0 -3 -4.8 -7.5 -10.6 -14.1
4 Yards 100 150 257 297 325 350 375 400
  Bt. path +3 +3.5 0 -3 -5.9 -8.8 -12.2 -16
5 Yards 100 150 264 305 325 350 375 400
  Bt. path +3 +3.6 0 -3 -4.9 -7.5 -10.6 -14
 
 
No At yards 10mphXwind Velocity Ft-lb’s
1 300 6.6 2468 1893
2 300 5.4 2569 2036
3 300 5.6 2388 1949
4 300 6.4 2293 1868
5 300 4.7 2420 2107
 
 
7mm SAUM Final.jpg

 
  Imperial Metric 
A .534 13.56
B .550 13.97
C 30deg  
D .534 13.56
E .320 8.12
F 1.538 39.06
G .497 12.62
H 2.035 51.7
Max Case 2.035 51.7
Trim length 2.025 51.4

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