sndmn11
"DADDY"
Remember that the point of the cold bow or cold bore challenge is not to compare yourself to anyone else which is why the prizes have nothing to do with the actual range someone shoots. The point is to make it fun to challenge ourselves in an honest way and to give each of us a better understanding of OUR limitations.
This is real close to my perspective. My goal with a rifle is to be deadly in any position within 100 yards, nearly all at 200, and to be really frank, it would take perfect conditions for me to take a shot at 400 yards on a big game animal, 300-350 would be much more likely as a max in the real world FOR ME. I do practice farther, but wouldn't consider anything beyond 400 to be in my MER now or anytime in the near future. You guys are talking about distances close to double. Just like I might practice very effectively with my bow out to 100 yards, that doesn't mean it is anywhere close to my MER. For me, shooting at an animal and a target are very different and our household has walked away from more on game shots with 100% confidence and zero regret than we have taken because of the idea of needing to "know" the whole scenario is good.
I would be game for a one day 10-20 shot standard process from varying positions and % of MER as position changed. Very similar to what @Phil Mendoza did with his challenge in 2020, but all in one day to clear the hurdle of getting to a safe rifle range. https://www.rokslide.com/forums/threads/effective-range-challenge-info.168610/