Glad it worked out for you - proof, indeed, that I don't talk out of my a$$ ALL the time. As for cast - v - swaged, it's a matter of rich -v - poor. Y'see, I'm a poor old part-disabled pensioner who can only afford to cast whereas you are undoubtedly some kind of bloated plutocrat who can easily afford to pay 25 times more than I do for the same thing, namely a little lead ball.
The lighter/heavier/warmer/cooler thing is not imaginary, BTW, it's a fact of life with shooting BP, especially rifle at long ranges - it's called RAD - relative air density, and has a tremendous effect on any longer shooting bullet, and here I'm talking about 900 - 1200 yards or so. 100gr of FFg on a cool day will feel totally different from that same load on a hot day, especially underneath a 500 or 600gr bullet.
tac, still not dead enough for someone, it seems.