Ed Harris
posted this
30 January 2013
http://lbtmoulds.com/
www.castbulletengineering.com/page0031.html
.303 BRITISH --This cartridge is ideally suited to cast bullet use. Excellent accuracy equal or better than Jacketed Bullet performance can be obtained from standard barrels and the 2 groove war production barrels.
It is not uncommon to find significant wear in some of the old Lee Enfield SMLE rifle barrels and this should be taken into consideration when choosing the cast bullet design and diameter you will use. We recommend sizing to .313” minimum with .314” often a better choice.
Bore sizes are generally consistent at .303” while groove diameters we have measured range from .312” up to .314” in standard barrels. The 2 groove barrels we have measured again are consistent at .303” bore size but even new barrels can be as large as .318” in the grooves. This is one instance where an undersize bullet can still perform as the wide lands in 2 groove barrels displace a large amount of the driving bands and this displaced alloy tends to fill the oversize grooves.
Our bore riding nose type designs feature nominal .303” nose diameters. Some of our later designs have slightly larger nose diameters from .304” to .305". Illustrations available.
73 de KE4SKY In Home Mix We Trust From the Home of Ed's Red in "Almost Heaven" West Virginia