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Warning: Bullet selections are specific, and loads are not valid with substitutions of different bullets of the same weight. Variations in bullet material and length will alter net case capacity,  pressure and velocity results. Primer selection is specific and primer types are not interchangeable. These data represents maximum loads in our firearms and test equipment and may easily be excessive in other applications. All loads should be reduced by 3%,  and developed following safe handloading practices as represented in established reloading manuals produced by component manufacturers. Presentation of these loads does not constitute a solicitation for their use, nor a recommendation.
 

Cartridge: 303 British

  Firearm: No.5 MK1 Jungle Carbine   Max COL: 3.075″
  Bullet Diameter: 0.311″   Primer: CCI 200
  Barrel: 19.7″   Reloading Dies: Lee Precision
  Max case length: 2.222″   Group: Distance 50 yards – Three shots

Military Metallic Sights – Loads Kept Within SAAMI 49,000 MAX PSI

COL and Capacity   Load Data & Performance
Bullet Type Bullet
Weight
C.O.L.
Inches
Net
Grains
Water
  Powder Charge
Grains
Muzzle
Velocity
FPS
Muzzle
Energy
Ft/Lbs
Group
Size”
Sierra 125 2.900 51.4   Re17 51.0 2798 2173 2.2
Sierra 125 2.900 51.4   Benchmark 44.0 2822 2210 1.9
Sierra 125 2.900 51.4   H414 53.0 2637 1930 2.6
Hornady SP 150 2.992 50.3   Re17 48.0 2588 2231 2.0
Hornady SP 150 2.992 50.3   BL-C2 47.0 2597 2246 2.5
Hornady SP 150 2.992 50.3   Win760 50.0 2640 2322 3.1
Speer 150 3.040 52.2   Re17 50.0 2724 2472 2.7
Speer 150 3.040 52.2   Varget 46.0 2639 2320 2.6
Speer 150 3.040 52.2   H414 51.0 2645 2329 2.7
Sierra 180 3.075 49.6   Re17 46.0 2583 2667 2.9
Sierra 180 3.075 49.6   BL-C2 44.5 2455 2410 2.7
Sierra 180 3.075 49.6   IMR3031 40.0 2479 2456 2.4
Remington 180 2.952 48.6   H414 47.5 2473 2444 2.1
Remington 180 2.952 48.6   IMR 3031 40.0 2441 2382 2.8
Remington 180 2.952 48.6   RS BigGame 45.5 2418 2338 2.5
Rifle’s accuracy was better than my eyesight