I know how toxic's uncle feels. I too am a stubborn guy and do things that I should not do, being too proud to ask for help.
Certainly, he should be allowed to use a .223, as has been well said in many of the posts.
If I was offered a chance to get out this November, here in the Ottawa Valley, to a camp, with all of my infirmities & problems, I would jump at it, with my Husky .243, currently in the EE.
I sold my Winchester M70 in .338 on the EE, which was my favourite hunting rifle of all that I've owned over the years but having much less weight that I had, and full of blood thinner, I've been told I should refrain from recoil.
A license here in Ontario for deer is reasonable whereas in Quebec, where are cottage is with lots of deer, where I have an ATV, non-resident tag is well over $200 and only for a buck! No Way!
I must confess here, this post is being composed in Thunderbird (for spell check etc.)> Firefox > to get up on CGN, as a trial.
But all that I've said above is true.