Reloading The .303 British Rifle

Posted on: Thursday January 7, 2021
Reloading The .303 British Rifle
MD Smith

MD Smith


(Note: These are near maximum loads, you should use 10% less to start.)

(See note on Powders below or read all about various
Powders.)

Bullet is .311″ diameter. Some people use the standard 30 caliber bullets (.308″ dia) and it will work, but not well. I don’t recommend it. Much better accuracy and performance can be obtained by using the .311″ jacketed or .312″ 7.62x 39 Russian. Due to different barrel lengths, type of bullet, seating depth, primer type and other factors, you may not get near the FPS charted. It is just a guide and the reason you should start under these charges and work up.

MAXIMUM LOADS – – DO NOT EXCEED — Start 10% less

123-125 grain Speer (125 Spitzer SP & 123 FMJ)
IMR 4895 45.0 gr. 2,840 FPS
H380 48.0 gr. 2,700
Reloader 15 46.0 gr. 2,788
AA2230 43.0 gr. 2,790
150 grain JSP
IMR 4895 42.0 gr. 2,594 FPS
H4895 42.0 gr. 2,479
H450 50.0 gr. 2,306
H414 48.0 gr. 2,482
H380 44.0 gr. 2,443
A2230 43.0 gr. 2,704
A2495 46.0 gr. 2,727
A2700 48.0 gr. 2,561
IMR 4064 43.0 gr. 2,554
180 grain JSP
IMR 4895 40.0 gr. 2,320 FPS
H4895 40.0 gr. 2,295
H450 50.0 gr. 2,281
H414 46.0 gr. 2,304
H380 42.0 gr. 2,276
A2015 38.0 gr. 2,420
A2495 44.0 gr. 2,478
A3100 46.0 gr. 2,024
IMR 4064 40.0 gr. 2,283
180 grain LEAD
A2230 39.0 gr. 2,459
A2495 44.0 gr. 2,529
A3100 46.0 gr. 2,063

Discussion: If full power loads are used in the .303, the cases will not last very long. With reduced loads, they will last a fairly long time.

The .303 was originally adopted in the late 1880’s and lasted untill it was replaced in 1957 by the 7.62 mm Nato round. It started out propelled by black powder and later replaced with smokeless. It had similar speeds as the 30-40 Krag.

* #2400, Reloader 7, 11, 12, and 15 are products of Alliant (formerly Hercules) Powders. H380, H414, H450, H4350 and H4895 are products of Hodgdon Powders. IMR 3031 and IMR 4895 are products of IMR (formerly DuPont) Powder
Company. A2230, A2495, A2700, A3100, A2015 and A2460 are products of Accurate Arms Company WMR, WSF, WSL, 760, 748, 680, 231 and 540 are products of Winchester, Components Div.

References: Accurate Arms Co. 1996 Reloading booklet – – Alliant Powder Co. Reloaders’ Guide (1995) – – Hodgdon’s Basic Reloaders Manual (1996) – – Speer Reloading Manual, #12 – – Winchester Reloading Components Manual, 14th edition – – Lyman Piston & Revolver Reloading Handbook, 2nd edition. – – VihtaVuori Oy Company,reloading booklet (1995) – – Numerous magazine articles on reloading special calibers and personal loads where noted.