6.5mm-303 Epps data

[gunners]

Mines on the right next to a factory 180 .303brit
COAL 2.990
Quick load gives me
150 gr speer
H4350 57.5gr @103.6% fill
49,454psi.
Velocity= 2806fps
Actual chronograph 2801,2807,2812fps

 

[Varmtr]

Thanks Gunners
Only just found your reply today. It look similar to a 303 wildcat that a couple of New Zealand guys did called the 303 ICBM.
Looks like min body taper with a 35 degree shoulder angle, good mv especially using a No4 action.
I got to get the QL program would be handy, especially it includes the ADI powders, even thou ADI do make quite a few Hogdgons powders.

 

[gunners]

Done a little more development with Reloder 17 more or less to prove quick loads predictions 174gr got 2696fps avg, 150gr got 2906fps avg, 125gr got 3068 avg.
OCW for 174 should be 2752fps, 125gr 3082fps which are below my limit for a No4 action. So if my action was stronger like yours I could run the 150 at about 3028fps if the brass would withstand it.
Plenty of power from an improved case I think