The 130 Gr Speer HP is a pure varmint bullet ( soft lead core and thin jacket), so is likely to shatter in the first 6" of animal. Not a good choice for the tough woody structure of a hog's skeleton. If you want a light 308 bullet, I have had good results with the 125 gr Nosler Ballistic Tip because the heavier base will often continue to penetrate even when the core is gone at impact velocities in the 1800-2900 FPS range. My favorite medium game bullets in 223 are the 53 gr Barnes triple shock, the 60 Gr Nosler Partition, and the 60 Gr Hornady SP. Another thought for the 308 is to use 150 gr flat point bullets intended for the 30-30 and reduce the velocity to 2400 fps since you are at such short range.
Planning your kill zones to ensure a controlled backstop is always important and shooting from an elevated position is very wise.
At 40 yds consider a rifled shotgun or maybe a pistol - caliber rifle