[M.T. Pockets]

I agree that the only way is to measure off 400 yards and find out. I sight my .300 Win. dead on at 200 yards. On a still day it groups from 2" - 4" at this range, if I'm shooting well.

Step back to 300 yards and the group opens up a bit and moves down about 8". A 10 mph crosswind will also move the bullet a few inches at this range. I'm still very comfortable shooting at 300 yards.

Moving to 400 yards is a big step from 300 yards. The group will open up to about 12" and down about 24" - 28". I've found that most ballistic charts are a bit too proud of the trajectory at longer ranges and the drop is more than they say.

A 10 mph wind could move your group quite a ways. Make sure you have a big target. I'd say shooting at 400 yards is at least twice as hard as shooting at 300.

I'm just a hunter that likes to shoot a lot. I know target shooters that can shoot much, much better at that range. But they've worked extremely hard over a long time to get that good, and they have better equipment than my factory rifle & ammunition.

Have some fun and get out there and shoot for yourself at 400 yards, you'll have some fun and it's good practice.