I booked a hunt in the summer of '08. I need some advice.

I have acheived some great groups with my 45-70 using a 300gr. Hornady hollow point bullet going at ~1900fps. Is this a good enough load, should I go for a heavier bullet, or faster velocity?

I also have some great groups with my .308 using a 78gr. Hornady A-MAX. I still have not chronoed it, but according to the manual, it should be around 2100+ fps.

If these loads are good enough for hog, where should I place my shots for the 45-70 and .308 respectively. I've seen people on the boards shoot for the lungs, and some shoot somewhere on the neck area. I don't know if the shots are dependent on the bullet being used. I also read someone's post saying to go for the head using a .308. What is the easiest shot. I'm thinking the lung area because it's so large. Thanks for your help in advance.