Another thing you might do is download one of the following calculator, it helps get things pretty close to whee you want them. The initial post has one but there is a link to another I think. I use the one put up by Bompo but it is the older one before the last couple of updates. It works out pretty well for me.
Lead-alloy-calculators
Another program I use with this is called Convert. Its good to pull up the smaller amounts of tin due to the calculator using pounds as a reference. To me figuring decimal percentages of a pound in my head just don't cut it. With Convert, you simply set the input to pounds and the output to ounces and start throwing in numbers. Its nice to be able to throw in say .076 and find out exactly how many ounces that is. Since most recommend not exceeding the percent of antimony with tin I usually shoot for something close to or equal to what I am using. Also since most of the more common metals used are listed along with they close approximate of components, it is really helpful.
Just doing a quick look, I might start out with the following amounts and see where that got me,
Pb - 4#
Lino - 1#
95-5 solder - .08# or 1.28 oz
This should give you something in the neighborhood of a 2.28 / 2.44 / 95.3 (Sb/Sn/Pb) and run around a 11.5 hardness.
I wouldn't sweat the water dropping until after you shot some that fit. I'm using some alloy in my .357 that is only a 9.5bhn and running it up to around 1150fps with no issues.
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