As I have stated previously in other posts, I am not a rifle caster. However, I am now going to be helping a friend of mine with his 300 Blackout. He wants to shoot high speed, and heavy subsonics through a suppressor. Also wants to shoot hollowpoint and solids for hunting. Mainly for hog. Playing around with the lead alloy calculator, I came up with this:
Attachment 97247
The idea was to keep the copper down to close to .1%, and not let the antimony content exceed that of the tin. At least in my head, by what I have read, and trust me, just on this site there is a LOT of reading, that it should make a fairly tough, yet malleable bullet. Hardness might have to be increased quite a bit for shooting through a rifle. I have pure, lino, foundry, range scrap, COWW, SOWW, 50/50, 60/40, 63/37, #2, and the solder listed to play with.
The plan is to also ESPC the boolits using a 315 degree cure polyester coat.
Now, for the kicker. We currently do not have any molds to test this with yet. If the calculation looks correct, or if someone has something in mind that will work better, I am always open to better ways of doing things.
The custom alloy I have listed on there is from some solder wire I have that I had analyzed.
If someone would be interested in testing this solder as an additive, in an attempt to meet the requirements stated above, I can send 2-3 pounds to them, but please, do not waste my solder if you want it. I have a decent amount of this stuff, but it is a finite supply. Once it's gone, it's gone. Accurate posted results would be expected as the price, but any left over would be yours to keep, of course. For what I can tell, a little bit of this stuff will go a long way. Thanks.