As in a lot of posts about using BP, the lead concoctions are all over the pages. Realizing that a certain rifle might prefer a different mix, I was wondering where the middle to best concoction occurs. Seems that tin will make casting easier and lend a little hardness to the mix. Antimony simply provides the higher Brinell numbers. Or all three comes up with the Lyman #2 mix using the correct percentages. 
A number of posts announce that the mix has moved slightly to harder bullets which seems to go against the BP effect.
Where is the point where you rely on the bump up effect and still get good velocity? And no leading. For the sake of conversation, let us assume we are using a superb lube and does not lend itself to leading.

It's generally determined by getting out to the range to find out what your individual rifle likes the best and it does make a difference. I spent a little over year using different alloys some were mixed with harball, linotype, lyman 2 of varying amounts including lead and tin. To make a long story short all though I found some mixes containing various amounts of antimony that shot extremely well 1-16 tin and lead ended up being the most day in, day out and year round most consistent for my use. All though the testing was extremely enjoyable for me it was also very time consuming and I learned allot of what I hadn't known prior too of some real value and I would do it again. The way one needs to look at it or the way I did and still do is it is a point gained by finding the right alloy or simply a point lost by not taking the time required to find the correct one for your rifle. It all boils down to how much one would like to get out of his rifle the very best it has to offer or if one just feels good is good enough to reach his own personal goals that he has chosen to set for himself.

JLouis