Load Data

Safety Warning

  • Reloading ammunition is an activity that possess with it a certain amount of risk due to hazards of storing and handling flammable chemicals (powder), incendiary devices (primers) and bullets containing lead.  
  • All reloading components as well as loaded ammunition should be stored properly and securely in accordance with all laws, local and Federal.  
  • All components should never be handled by children or women who may be or are pregnant or breast feeding.  
  • Reloading should only occur in a well lit and ventilated area, free from distractions. 
  • Whenever changing production lots of any component, you must revalidate your load by reducing the charge weight by 10% to account for manufacturing lot-to-lot variances and increase from this new starting load in incremental steps being observant of pressure signs while measuring velocity using a chronograph.  
  • If you reach your previous recorded velocity at a lower charge weight, stop increasing the charge weight.  
  • If you reach your previous charge weight with no pressure indications and the velocity is less than your previous performance, proceed with your load development is smaller .2 grain increments.  
  • Loading without a chronograph is dangerous since a chronograph can provide measured data that pressure is increasing based on the incremental gains in velocity. 
  • North American Sportsman, LLC, Raptor Shooting Systems and / or its principals expressly disclaim any and all warranties with respect to use of the data presented herein.  Users assume all risk, responsibility and liability whatsoever for any and all injuries (including death), losses or damages to persons or property (including consequential damages), arising from the use of any product or data, whether or not occasioned by negligence or based on strict liability or principles of indemnity or contribution. 

SAFETY FIRST, SAFETY LAST, SAFETY ALWAYS!

Loading data will continually be revised and published only here on this website as new bullets and powders are evaluated.  

Copying this data to any other website or publication is a violation of US Copyright Law. 

  • All loading data was tested with new Winchester 308 Winchester commercial brass on the 1st Following the first firing, end users can expect a small increase in case capacity.
  • When using Lake City Military Brass or any other brand of brass, there can often be a difference in case capacity due to brass thickness. Exercise due care and always adjust your starting load accordingly increasing your powder charge in small increments.

Methods of observing, not measuring, pressure:

  • Measure all shots during development with a chronograph recording data and observing incremental gains in velocity.  When velocity gains increase in larger increments, pressure is rising at a faster level.
  • On new brass only, measuring the inner diameter of the extractor groove using a knife-edge caliper comparing new unfired brass and fired cases. You will see some growth between .001”-.003” depending on the brand of new brass.   Reminder, this method of measurement is applicable to NEW brass only and does not apply to brass that has previously been fired which experiences work hardening.
  • Observe markings on the case head from the ejector which can be indicator of higher pressure
  • Observe Primers for changes in the appearance after firing. Some flowing of the primer is normal, but flattening of the primer or seeing flowing of the primer around the firing pin strike are indications of high pressure.

Sierra 250 Grain Game King – 2.690 inches COAL

Powder: Alliant Reloader 10x

  • Primer: CCI 250
  • Brass: Winchester 308 Winchester Commercial – 1st Firing
  • Starting Load: 41.0 Grains
  • Maximum Load: 44.4 Grains
  • 2465 fps with 18 inch barrel

Powder: Vihtavouri N530

  • Primer: CCI 250
  • Brass: Winchester 308 Winchester Commercial – 1st Firing
  • Starting Load: 42.0 Grains
  • Maximum Load: 45.3 Grain
  • 2425 fps with 18 inch barrel

Powder: Ramshot X-Terminator

  • Primer: CCI 250
  • Brass: Winchester 308 Winchester Commercial – 1st Firing
  • Starting Load: 42.5 Grains
  • Maximum Load: 46.0 Grain
  • 2380 fps with 18 inch barrel

Powder: Accurate Arms 2200

  • Primer: CCI 250
  • Brass: Winchester 308 Winchester Commercial – 1st Firing
  • Starting Load: 42.0 Grains
  • Maximum Load: 45.0 Grain
  • 2450 fps with 18 inch barrel

Speer 270 Grain Boat Tail Soft Point – 2.790 inches COAL

Powder: Alliant Reloader 10x

  • Primer: CCI 250
  • Brass: Winchester 308 Winchester Commercial – 1st Firing
  • Starting Load: 41.0 Grains
  • Maximum Load: 43.0 Grain
  • 2335 fps with 18 inch barrel

Powder: Vihtavouri N530

  • Primer: CCI 250
  • Brass: Winchester 308 Winchester Commercial – 1st Firing
  • Starting Load: 42.0 Grains
  • Maximum Load: 44.6 Grain
  • 2325 fps with 18 inch barrel

Sierra 350 Grain Match King – 2.800 inches COAL

Powder: Accurate Arms 1680

  • Primer: CCI 250
  • Brass: Winchester 308 Winchester Commercial – 1st Firing
  • Starting Load: 30.0 Grains
  • Maximum Load: 33.0 Grains
  • 1825 fps with 18 inch barrel and 1725 fps with 10.75 inch barrel.

LeHigh 175 Grain Controlled Fracture – 2.715 inches COAL

Powder: Accurate Arms 1680

  • Primer: CCI 250
  • Brass: Winchester 308 Winchester Commercial – 1st Firing
  • Starting Load: 41.0 Grains
  • Maximum Load: 43.50 Grains
  • 2850 fps with 18 inch barrel and 2525 fps with 10.75 inch barrel

Powder: Accurate Arms 2200

  • Primer: CCI 250
  • Brass: Winchester 308 Winchester Commercial – 1st Firing
  • Starting Load: 45.0 Grains
  • Maximum Load: 47.8 Grains
  • 2650 fps with 18 inch barrel

LeHigh 175 Grain Match – 2.715 inches COAL

Powder: Accurate Arms 1680

  • Primer: CCI 250
  • Brass: Winchester 308 Winchester Commercial – 1st Firing
  • Starting Load: 41.5 Grains
  • Maximum Load: 43.50 Grains
  • 2850 fps with 18 inch barrel and 2525 fps with 10.75 inch barrel

Powder: Accurate Arms 2200

  • Primer: CCI 250
  • Brass: Winchester 308 Winchester Commercial – 1st Firing
  • Starting Load: 45.0 Grains
  • Maximum Load: 47.8 Grains
  • 2650 fps with 18 inch barrel