wheel weight lead is my base alloy
I am not sure what base you are using (pure lead)?
if you are using pure lead ---> trade some of it for harder lead, instead of trying to make it harder
Really hard lead, can be brittle and can shatter
Wheel weights air cooled with a gas check can be pushed to 1900-2000fps and higher
Range lead is even harder then WW (center fire lead)
then there is the option of Heat treating a Lead alloy that can make it very hard
In my experience WW need a bit of tin to help fill out (and i mean only a bit)
16-32 inch of lead free solder added to a full pot
I would like push the lead bullets as fast as my barrel will allow me(bore fouling/leading being the limiting factor) . Just to see what they are capable of. Any bullets that I plan to shoot faster than 1500 fps. are designed for gas checks.
I am shooting mostly .308 Winchester, and just feel that gaschecks keep my bullets in better shape at these pressures/velocities.
I also shoot .358 & .458 diameters as well.
All rifles, but some pistol calibers in the mix.(.38Special,.357Mag. .357Maximum,.35Remington,.357Herrit) 45-70Govt.
I know that some larger caliber/weight bullets dont need gas checks at sub1900fps. My shoulder wont let me shoot them much LOL!
You are correct that tin helps the lead alloy 'fill out' in the moulds. (reduces surface tension/ or makes the alloy wetter, so to speak. Thats why I wanted the 50/50 bar solder. I have a roll of wire solder, and have used it.
I was using a friends lead hardness tester (my new one is in the mail still).
I am hoping I can adjust my alloys hardness according to individual needs. Also hopefully be able to repeat the same alloy specifications dependably. With the limited equipment I have.
Heat treating is an option, but my better half would not appreciate having a mildly toxic element in the oven were our food is cooked! LOL! I know its no problem, but for her peace of mind, I wont do it.
I still have to try the straight Wheelweight alloy at higher velocities (1800fps+). Hopefully it will be fine. It would be allot less work/alloying if wheelweight lead would shoot MOA, and at 2000-2200fps.(without leading the bore) But I some what doubt it.
The linotype I am using now is doing 2050fps, and has shot around 1.25" at 100 yards a few times. Some times more, some times less. More load development is in the works.
Quite often, 3-4 bullets will cluster inside the inch range. But 5 shot groups are usually 1"-1.5" This cast bullet shooting is a challenge! But I'm enjoying it.
Thanks for the replies guys.