I used some Trail Boss in cast British .303 reloading today. Did the quick numbers last night and whipped up four sets of 5 cartridges all with 185 gr cast lead bullets. Used the four Lee powder scoups 2.2, 2.5, 2.8, and 3.1 cc which is about 10.6, 11.7, 13.2, and 14.6 gr of TB resp.
Shot at 50 m. out of a 1916 BSA SMLE.
The lowest charge grouped best but was like 14 inches low. Middle charges were pretty wild, 2nd lowest especially. Highest charge was 2nd best group but was also back to around 2 inches low vs POA.
I do believe I'll continue and try and develop a 95% +/- charge.
I am encouraged.
BTW I tried 'the Load' [13.0 gr Red Dot] with this bullet and gun before and while the bullets hit near POA and grouped OK they almost always keyholed. None of the shots today with TB keyholed.
Update: Tried the heavier charge .303 loads today and that didn't pan out, groups were poor. In the meantime I whipped up some 7.5x54 French with Trail Boss too and again the lighter loads were more accurate. It is the range Trail Boss was designed for, that is, slower lead bullets. I don't like jacking the sights so high hence the 95% attempt but I guess the large drop goes with the territory.
Last edited by Lars; 02-21-2010 at 12:42 AM.
Assault weapon is a term invented and used for propaganda.