I hope the 1/4 is enough for 400-800 yrds!
I was punching holes in 1/2" @ 600 yards with a 243 Ackley.
, the same metal looked like Swiss cheese at 800 yards with my Edge.
AR500 is where its at, plain and simple.
On a side note 1/2" T1 will stop just about anything (within reason) @ 1K.