For hunting to 350 & possibly to 400, you are fine with your sight in and hold over plans, as long as you know the size of your target in inches. For that plan bigger targets are more forgiving, smaller targets shorten the range it will reliably work. For example, I’ve used an 18” avg. chest size for mule deer for a long time and mentally divide the chest depth into 1/3’s.Alright then…I guess I’ll have to consider just basic RF binos or a great handheld. Any suggestions?
I have never tried to holdover for a 400 yd shot before. I zero at 200 yards with my 7 rem mag at the gun range and practice at that distance.
According to ballistic data, supposedly about 6 inch drop at 300 yards, then 18 inch drop at 400 yards with 150 gr Remington Scirocco ammo.
With your guesstimate ballistic info, at 300 you hold at the top of the middle third, 350 at the top of the deer or slightly over. Dead deer result as it’s adequate precision for the task at hand most of the time. I do practice to 600 and don’t dial unless it's past 350 or 400 depending on the quarry. It works well for me.
You do need to actually shoot at 300, 350, & 400 to verify your dope. But odds are the ballistic data you have is close. You probably won’t win any challenges shooting at steel and using inches for hold overs vs these guys. Is what these guys are saying a more precise method, yes. But with practice it’s not necessary to consistently kill big game to 350 and maybe 400.
Many of these guys shoot to 500, 600, 800, or more. Their advice to zero at 100 is good for what they do because you need not worry about density altitude to any degree for shooting at 100. Zero at 100, dial what ever the calc says based on the environmentals and dead deer result. I’ll know my 100 zero, but I do dial it up for a 200-225 zero to hunt with. I don’t dial until past 350 or 400, but do know my marks to 600, which is as far as I can easily practise. If you have to check zero while hunting knowing the 100 zero is money.
Regardless of what you decide to do, practice is the key.