wheel weights vs 20-1

[camerl2009]

ok im making a mold for my martini henry mk 4 witch uses a .470 480gr bullet the only choice of alloys is wheel weights but i need 20-1 lead/tin

it has to be close enough to 480gr and .470-.472 as these guns where made for one load and the sights are not adjustable (only for yardage) how close will wheel weights get me to this if i use 20-1

[mtngun]

Sorry, my molds are not designed for black powder alloys. Please do not order a mold spec'd for wheelweight and then use it for a black powder alloy.

20-1 is nearly the same density as WW, but apt to cast a different diameter. 20-1 requires a smaller sprue hole.

[camerl2009]

this is a coustom mold makers website right 20-1 should be a choice this gun is picky on what you feed it and it likes 20-1

i need a flat point mold for hunting

[mtngun]

[camerl2009]

ok then how to i adjust the wheel weight alloy on the design thing to cast a .470 480gr bullet in 20-1 the sprue plate and block material does not matter lee molds are aluminum and thay cast just fine with so called blackpowder alloys. even through 20-1 works well in revolvers

and making a mold to customers specifications is making a custom mold

[mtngun]

There is no predicable formula for as-cast diameter of a given alloy. Every mold and every bullet design behaves a little differently.

Sprue plate most definitely matters. WW requires a different sprue hole than BP alloy. A WW sprue hole will be extremely difficult to cut with BP alloys, distorting the bullet base, and putting a lot of wear and tear on the mold.

Lee blocks are much much smaller than my blocks -- which is a good thing, for BP alloys, which require a hot block. Lee blocks are also a different alloy that is not heat treated.

[camerl2009]

so what to do then as i need a bullet mold made for this gun that will cast at .470-.472 and close to 480gr in 20-1 theres no other alloy i can use for this and its a hunting bullet going to be used on moose and bison so a flat point is necessary

i dont see that 20-1 is a bp alloy as many many people use it for handguns

[mtngun]

Well, seeing as you want a custom mold for a BP SSR application, and since there is a GLUT of custom moldmakers for BP SSR, I suggest you contact one of them and go from there.

Thread locked.

As I have said before, it is not the purpose of this forum to beg for custom work that we never claimed to do.