I used my 25-06 with 100gr BT for a head shot on the first one I got, I have also used my 243 with a reduced 90 FMJ load and my 12 guage.
As far as I am concerned if I ever get a chance to go again, I will use the 243 and reduced loads. It wasn't nearly the noise almost hardly noticed by the rest of the flock, had the one I shot not been flopping a wee bit, and I didn't have to pick shot out at the supper table. I shot one in the head and another through the breast and out the back both dropped with no major damage.
The shot gun one had a good amount of lead through out the breast, even though the majority took the head and neck. The 25 was simply a decap and game over, but the noise ruined the rest of the hunt.
Had a neighbor who shot them every year using 30-06 and 180gr Hornady Spire Points. He always waited until he could get a shot in through the top of the breast and out the back, his always seemed to be in pretty good shape other than the 30 cal hole, you couldn't really tell they were shot. There just wasn't enough there to really open the bullet so it seemed to just zip right through.