.303 Cast Bullet Load
Posted 19 Apr 2012 - 10:09 AM
I have been experimenting with HRBC 303 Copper Hawkes (with gas check) and several powders in both a 1942 SMLE Range Rifle, and a 1898 Martini Enfield.
Both shoot the same .311 Sierra Matchking HPBT bullets very very well, but neither handle the HRBC 180gn .311 FP cast projectile. Target looks like a shotgun has fired tumbling bullets at it!
I have just ordered the Lyman 314299 mould (.314 dia, 200gn)to see if a larger diameter cast bullet helps.
Posted 19 Apr 2012 - 05:34 PM
"The people never give up their freedom . . . Except under some delusion." Edmund Burke
"Let us remember that if we suffer tamely a lawless attack on our liberty, we encourage it." Samuel Adams
Posted 19 Apr 2012 - 06:22 PM
Spot on the money there Peter! I am beginning to think a Chronograph may be very useful for cast bullet load development.
Posted 19 Apr 2012 - 06:43 PM
The velocity range was for two reasons - one may be an old granny porky - the other is range regulations.
I was 'told' that a 20:1 lead:tin projectile would strip and lead the barrel if pushed faster than this. The second is that to shoot metal plate the range restriction is 1700FPS.
The view down the barrel of the Martini Enfield is black, but clear, rifling. I pushed a moly lubed patch down the barrel, then belted a .311 cast bullet bullet down from the muzzle end. Hard work until about six inches from the breach, were it virtualy fell through. It came out with very prominent rifling engraved on it. There is obviously some obduration of the projectile due to the belting down the barrel.
How do you measure the groove diameter when a groove is opposite a land? My vernier tips are not quite fine enough to fit into the groove.
I am a bit concerned about the sloppy six inches from the breach. My Seargents Tool view shows a clear chamber and then rifling. I pushed a projectile up the breach with a bamboo skewer until it stopped. Measuring revealed that the projectile would be about 1.25 inches from the case mouth as it engaged the lands. Obviously that first few inches of the barrel is a bit worn!
Posted 19 Apr 2012 - 07:22 PM
This is the reccomended loads direct from ADI for a 303. Hope it helps some
FOR LEAD PROJECTILES
BARREL LENGTH: 24 INCHES
BULLET DIAMETER: - .312 CALIBRE (.312 SIZED DIAMETER)
TWIST RATE: - 1: 10 INCHES
BULLET POWDER STARTING VELOCITY MAXIMUM VELOCITY
WT. TYPE C. W. APPROX. C.W. APPROX.
(GRAINS) ______MIN_(GRAINS) / (FT/S) / MAX_(GRAINS) / (FT/S)
185 grain ____AP50N____ 9.50 / 1375 / 13.50 / 1550
185 grain ____AP70N____ 10.50 / 1325 / 14.00 / 1585