qajaq,
Good shot placement is more the key than anything, a 170 gr bullet should do the deed. A swaged lead .22 lr has killed more animals than we'll ever know.
Some of my cast bullet and hog encounters have been;
A chest shot (charging) 350 pound Russian boar with a .35 whelen, using a RCBS 200 gr FN at around 1700/1800 fps.
A running broadside ferral pig with a .30/30 with a 170gr FN at 1800 fps
A 450+ pound russian/domestic mix with a .44 mag with a RCBS SWC at around 900fps.
a ferral pig with a .45 colt, a 255gr swc at around 850/900fps.
I have also been present with folks using the same or similar loads, All of which worked well.
You haven't mentioned what caliber you are using. There are several charts and formulas that factor in bullet face diameter and sectional density as well as weight and velocity into their equasions for "knockout" power or energy.
I'm interested in what tactics/ methods you plan to use, ( spot and stalk, bait etc.)and what caliber you are working with. What kind of shot you expect to encounter, and what distances you expect to shoot at, they are as important or more important than what weight and velocity you are getting.
I hope this gives you some information to go on, Rvtrav