You are going to have to but both and shoot them. I found some 270 ammo for $10 a box and bought 10 boxes for practice. It would shoot around 1 1/4" to 1 1/2" Not too bad. Especially when the ammo I hunt with shoots a half inch smaller at 100 yds and costs 4 times as much!

Dont shoot through brush, I dont care what the idiot at the gun store told you. 400 yds not really that far away for a clear shot. Just about any centerfire will do that.