I'll round up the a diagram of the pellet dimensions soon.
There is another way to make a mold which I would probably choose over the lead pellet if you're using a 1.57" Bofors barrel. Here's a quick diagram of it, and it will work at all ranges, not just 200yrds or less. It will work with both lead and zinc, but I would use zinc because of the weight. Lead or zinc both shrink about 1%, so the section that was cast in the barrel area will come right out. I've tested this and proven it many times. I would use this technique on the mountain rifle if the rifling was not prohibitive (saw tooth). You will have to do a little experimenting to determine how big the engagement area (how long of a section of bore) will be because at some length it will bind up because of the gain twist. I would cast different length plugs in the barrel section and push them through the bore to see what you can get away with. You can pour around a piece of conduit standing in the section which makes something that looks like you would use for lapping. This rifled plug on a conduit handle can be pushed down the bore and retracted if it binds. Use a lot of oil too.
You may end up being able to use something that looks like the first drawing, or be limited to something like the second.