I agree shot placement is what is knocking them down, not the fact you are shooting a 270. Put together an AR in 6.8, 6.5 or 300blk and try it out. With todays prices online you should be able to put together what you need with glass for under $1000. Semi auto and mag capacity aren't necessary, but they sure are nice when you get into a big group of pigs.

For what you're wanting... Browning BAR is a great solution. I'm a huge fan of 270 but I think everyone is right about shot placement. It ain't the caliber that's doing the trick. -Earl

got these 2 with my bolt 270, no hollow points or ballistic tips. 3 shots, bigger pig only took 1 and the smaller one took 2 on the run. Y'all better peep that cartridge, 3200 fps and 2800+ ft/lbs. look at that exit hole, my goodness. I'm not concerned with eh round itself, I was wanting to know about the AR platform in that caliber. If its size i need ill just use the 300WM. but for pigs 100-400 pounds i haven't been disappointed in my little deer rifle yet. I just want the semi auto cuz every time we see pigs its always a big group. more shots means more death for the swine.

best combination of weight and power is AR in 6.8 or 7.62/39/ like hornady sst, ammo in both calibers, only use i see for 300 bo is if you are going surpressed, AR 10 are great but heavy and recoil so hard difficult to get back on target, anything hit while 308 is dead