From its inception I never got very exited about the 204. I kept comparing it with the 22-250. I had one when it was called the 22 Varminter in the later 1950tees. I decided on a 223 Handi, but it was a poor shooter, a swap barrel was no better perhaps worse to called a varmint rifle.
So I rebored the 223 to 6mm and made it into an all time tested one hole
shooter the 6x47. With a 1-12" twist it handles bullets for deer.
But with 50gr BT it is deadly on coyotes out as far as I can hit them about 350yrds. MV is 3500 ft. not pushing it in a Handi rifle.
With all what I read about the 204 I think the 22-250 is a better choice, and my 6x47 is close behind it. The 6x47 uses the same parent case as the 204
but uses a substantially heavier bullet. Of course it is a wildcat, so what, its accuracy of less than 1/2moa qualifies it for a genuine varminter.