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Taken from Layne Simpson's Handloading Column:

Velocity Tests: 6.8mm SPC Remington

Velocity averages taken from one 10 shot string clocked at 12 feet from the muzzle.
Remington Brass was used throughout testing.
Remington 9 1/2 primers used in all loads for the Model 700 LTR
OAL = Over All Length
FPS = Feet Per Second
* = Compressed powder charge
Reduce all powder charges 10% for starting loads.

Remington 700 LTR w/ 21" barrel

Hornady 110gr. V-Max
RL-12 - 31.5 Grains
OAL: 2.345"
Vel: 2,721 FPS

Nosler 130gr. Partition
IMR-4895 - 30.0 Grains
OAL: 2.400"
Vel: 2,428 FPS

Sierra 135gr. MK
Benchmark - 28.5 Grains
OAL: 2.470"
Vel: 2,457 FPS
 
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