LG,
I use various alloys with b.p. depending on the application...from pure lead to 50/1 to a mix of w.w./lead to plain w.w with 2% tin added.
I was using a mix of w.w. / lead (11 BHN) when I shot the targets illustrated.
SPG has worked very well for me ... at least in the cartridges with a 40 gr. charge and lower sectional density bullets.
As they say, "A picture is worth a 1000 words." and the targets do speak for themselves.
I have thought about getting some DGL lube to try but haven't done it yet.
w30wcf