As long as you hunt the same elevation, temperature, and never swap ammo (and bullet lots never change), you are good to go with a custom turret.
In all actuality, a custom turret works fine for shots to 500-600, even if you change some variables. Beyond that, a lot of variables start to really effect bullet path.
I want to clarify this statement. You also have to know your actual bullet and velocity! I recently had a buddy who asked me to look at his scope. Said all his shots past 100 yards (his zero range) would start to hit high as he went out when he dialed his custom turret. Which caused him misses on two big Coues bucks last fall.
As soon as I picked it up, I knew what his issue was. I told him no way was the velocity on the turret was correct, which would throw his drops off.
.270 Win
Factory Federal 130 NBT ammo
100 yd zero
He had shot a couple over a chronograph that must have had something VERY wrong with it. This is what it gave him. And what he gave Kenton...
2186fps. I told him when I picked it up, "No way are you only getting 2186fps from a .270 Win w. 130 NBTs in factory ammo."
I took it out to Cowtown, and shot two shots to confirm. I figured a rough estimate of 3100fps. Put that in my ballistic solver and came up with 6MOA for a 431 yard prairie dog steel. Which was his 275+/- yard marking on the turret.
This is 6MOA (24 clicks).
His 430 yard marking was at 14MOA (56 clicks-an additional 8MOA or 32 clicks=34.75" additional elevation)
His actual velocity was 3050 & 3056fps, for a 3053 avg. 867fps faster than he gave Kenton.
Here is the short video I made for him. Excuse the delay in the first shot fired. I had to adjust the diopter for my old eyes.