Personally.......I will never intentionally target a deers neck at a distance of 285yds.
The 85gr kills that I have made on both deer and hogs were a complete pass thru. My main reason for using bullets of the solid copper makeup is I do not like jacket separation. Same reason that I use hardcast lead with a wide meplate when loading my 444Marlin,454Casull,45-70,and 500S&W. I believe that even at speeds LOWER than the manufacturer states as "nominal" for their product,the bullet will still be effective.
Reloaders constantly load bullets of most any caliber,for most every chambering,at lower or higher speeds than the manufacturer designates as "nominal". Especially with the vast difference in the bbl twist rates of today. And ......... the rotational velocity as well as the forward velocity of a bullet will directly effect it's terminal performance. So will its intended target. All of these things are out of the direct control of the bullet maker. The bullet makers will tell you the bullets intended twist rate for bullet STABILITY .... NOT for terminal performance. This is one reason that I am a true believer in fast twist bbls just as long as you are a responsible reloader.
PLUS.....a bullet manufacturer has to come up with a high and a low speed for the "best" performance of their bullets. They do exhaustive tests of their line of bullets......BUT.....if they state that the bullets terminal performance will be best at between 2200 and 3000fps they never say what their test results were at speeds over and under the listed speed.
Remembering back in the day of the Hornady .224" 50gr SX bullets. When they came out they stated that you should not use these in the "fast" twist bbls of the Ruger Mini-14 (1:10). That was BS. I have launched these bullets out of a 1:7 twist bbl at 3300fps (AR). They were devastating on coyotes and woodchucks. --- pruhdlr