@Catahoula Fella I know, by the name of John Bissell, wrote an article approximately twenty years back about his bullet experience with Hornady and Sierra in .243 and .308. He found that the Hornady Interlock bullets he used (for private hunting and control of red deer and pigs) were equivalent in hardness and performance to the next weight up in the Sierra Pro Hunter range. Specifically, the .243 87 gr Hornady soft point Interlock was equivalent to the .243 100 gr Sierra Pro Hunter. The same applied with the.308 Hornady soft point Interlock and the .308 Sierra Pro Hunter.
I suspect that a similar relationship would apply to the .257 87gr Hornady Interlock and .257 100 gr Sierra Pro Hunter projectiles.
John still hunts for recreation and writes articles to help new hunters but these days spends more time managing at his computer than out in the field.
Have fun with your new toy and remember ... the missus always knows when you get another firearm!
It is simply a matter of whether or not she tells you that she knows!