This has been a great thread!
I will add that there is no such thing as over gunned. There is such a thing as poor bullet choice no matter what cartridge you are using. I have been consistent in this thinking since long before I became a bullet maker. Someone early in the thread mentioned a bull that absorbed a close range shot. Sometimes strange things happen, but I am going to venture to guess that he either had a bullet that failed to deform properly or a bullet that shed too much weight with the high vel impact to penetrate deep enough and still retain enough vel once into the vitals to do enough damage to cause the needed trauma for quick blogs loss.
As a bullet maker I have learned that bullets that are marginally stable but still shoot accurately will have a higher probability of failure to track straightand deform properly. A 1.5sg or higher calculated at standard atmosphere at sea level, well greatly increase consistent bullet performance. Know the distance that your setup will retain at least 1800fps and limit yourself to that shot distance. And finally when it comes to elk, don't stop putting bullets in an elk until it is of its feet. If it is of its feet and still breathing, be prepared to shoot again. Don't get off your rifle until it is dead.
Steve
Thank you for the update, I agree this has been an awesome thread with everyone offering really good advice/wisdom.
MY plan is to use a premium factory round (no matter what caliber is ends up being) like Nosler accubonds or ABLR. I would think that can get the job done in a .30 cal or 7mm mag.