lead/tin vs. Lyman #2

[laowho]

Hi All,

Figured I'd make this my first question. Just finished reading the pertinent articles over at LASC, but these tend specifically toward handgun loads. Have also come across considerations for twist and other factors. This will be strictly for target out of the Shiloh Sporter #1 (30") with OE FF, DGL lube and 3 moulds: SAECO #645, Lyman #457124, and Lyman #457125. Assume normal loads. Guess I understand the importance of appropriate obturation vis a vis bullet BHN, powder pressure, and lube. Given all of the aforementioned parameters, I'm wondering:

whether any use of antimony (apart from $ savings) is advantageous or even desirable;
what the ideal lead/tin ratio is;
whether distance or conditions are coming into play in any of this;
and whether by water cooling for increased BHN any other advantage accrues, and if so, whether it's worth a possible trade-off re: the possible loss of casting quality that a certain percentage of tin might afford.

My first casts will be of lead/tin only at 20:1, but I often see 30:1 and have also seen 16:1. I've checked the pages here but may have been looking at the wrong section. This is for reference and comparison, and I'd be tempted to purchase some Lyman #2 alloy. Not interested in cost factors here, just performance.

Oh, and if I'm completely overthinking this, just say so, and maybe mention what I should be looking for (beyond leading and groupings) as I try various recipes. Thanks,Doug