Personally I used to be quite sceptical of .22 cals and 50-60 g on roe, and thus used to shoot .243, 6.5x55 and later 30-06...
When I turned to the .223, I was astounded by the efficiency they put roe down with. With a traditional soft point, at ethical ranges (sub 200m), the .22 cal delivers hydrostatic shock and can drop roe in their tracks. Now, so can a .243 of course, if the bullet is put through bone to initiate expansion..but I have seen more runners in .243 and 6.5x55 and even with 30-06 than with the .22 cals.
I recall Paul (then, @barony) commenting on his .375H&H and how even ‘that’ was letting reds run up to 100yds+ after a good H/L shot.
It’s all about delivering the right bullet into the right place, with the right velocity.
Interestingly, the 6.5x55 is drumming up tremendous popularity in the UK for deerstalking, but oddly, of all the calibres I’ve seen and used on deer, it’s probably the worst for dropping deer quickly and delivering hydrostatic shock.
The two most effective I’ve seen are the .222 and .223 with 50-60g soft points, .243 with 85-87g SP and HP through H/L or neck, and through shoulders,, 85g, 95g and 100g partitions, and the factory norma 100g SP.
The 30-06 with a 180g partition is also a very effective round on larger deer through bone. Leaves roe running, and reds stumbling about a bit when put through soft tissue.
As for .204 with 50g...well, like others have said, if you can deliver a bullet with stability and with the integrity needed to avoid bullet blow up, then in theory there’s nothing wrong with it,,but IMHO, it’s just making life difficult for yourself
As for Bergers on roe...suss...