Author: Goosic
Subject: Flight of the Bumble Bee
Posted: September 29 2020 at 8:54am
I have every intention of hunting Mule Deer and Javelina next year using my Custom No4. I have been collecting reloading data from every source available, be it old or be it fairly modern on the subject of the 215grn RN bullets used in the 303 British cartridges.
Subject: Flight of the Bumble Bee
Posted: September 29 2020 at 8:54am
I have every intention of hunting Mule Deer and Javelina next year using my Custom No4. I have been collecting reloading data from every source available, be it old or be it fairly modern on the subject of the 215grn RN bullets used in the 303 British cartridges.
Instead of using N202 or IMR4064, I have decided for these particular rounds to use IMR3031 for the powder and magnum primers for ignition. The 3031 is a fairly slow burning powder but is very stable with temperature fluctuations and the use of the magnum primers are strictly for a more controlled burn rate during the ignition process. I have a test load worked up and it will be tested at my next range session this week.
The Test Load: 303 British
Bullet: .312 215grn Woodleigh RN
Powder: IMR3031 40.0grns
Case: Winchester
Trim to: 2.215"
Primer: WLRM
Seating Depth: .375"
OAL: 3.025" + - .002"
Test Rifle: Early No4Mk1 "no star" Savage
20" barrel, 1-10" RH twist two groove.
All of the data collected shows either a maximum CUP of 43,000+ to a minimum of 35,440+ depending on powder preference. At any rate, it is below that of the working 45,000 CUP listed for Enfield rifles. I will update after I have released the Bee's...![]()
