In our lifetime, my Dad and I have shot many times past 300 yards at both targets and live game including coyotes and prairie dogs. But we've never tried shooting at 400 yards. I just put a nice rig together; it's a Sako A7 Tecomate in 270 WSM with Durasight Z2 Alloy steel bases and TPS HRT Alloy Steel rings. Topped off with the New Zeiss Conquest HD5 3-15x42mm with Rapid Z 800 reticle. We had shot the rifle at 300 yards with groups between 2 and 3 inches. But it had a Bushnell Elite 4200 on it at that time; when I put the zeiss on it; we wanted to try the 400 yard mark on the rapid z reticle to see if it worked like it was supposed to. So we sighted it in .86" high at 100 yards which is what Zeiss' ballistic calculator says we should do if we want all the hold over marks to be on clear out to 700 yards. It was very hot on this day; but we shot early and still the humidity was so high that sweat was just pouring! The bench was too short at the range we shot at; the rear sandbag was nearly falling off the bench; and my dad even had a premature trigger break because the bench was so uncomfortable and we were sitting on a darn spool that ground cable comes on and it was too high relative to the bench. Anyway; here's my dad's group.
4" group; 420 yards; 4.2" = MOA; Range confirmed with Leupold RX-1000i TBR
Here's my group: The 3 in the black; the one in the orange was our 100 yard shot to make sure it was hitting .86" high at 100 yards; and we thought it was close enough at .90 inches.
3.5" group; the 10-ring in the target is 7" diameter. Bullseye is 3"; 420 yards; so 4.2 is MOA
We were very impressed that the rifle was holding sub-MOA accuracy out to 420 yards.
When we drove out to the steel plate, all three of dad's trophy bonded bullets were stuck into the steel!! Velocity at 400 yards is around 2300 fps! The bullets were intact and mushroomed!
It's impressive how tough that trophy bonded bullet is; Most bullets we have shot splatter against a steel plate; Not These!