Re: Looking for rebarrel advice
If you want to use your magazine, the 6x284 is probably not going to work well.
Do you want to leave the bolt face alone? (22-250 is .472") And use the magazine?
If so, you could build a 6mm-BR, or 7mm-br, but they might be a little underpowered for you needs? Maybe not. The can be extremely accurate and there is excellent brass available.
If you don't mind opening up the boltface but still want to use the magazine, you could go to a 243 WSSM (probably get one fewer in your magazine than with the 22-250).
If you don't mind opening up the boltface and don't mind single shot, there are tons of options.
If some is good and more is better, then too much is just right.
My mind is a raging torrent, flooded with rivulets of thought, cascading into a waterfall of creative alternatives