Depending on your funds and how far you want to let the addiction go, I'd watch the classifieds for a newer sb2 receiver for a good price and send it in to be fitted with the barrel you want. Don't know if they have the Talo barrels, shorter with sights available. Or find a complete gun somewhere. Pretty much what Dinny said but I don't fit barrels. You may be better qualified for it.
If you haven't already, read the faqs about the year receivers to look for and a bunch of other stuff.
I should add I don't know much about cast and if one barrel likes them better. I too like downloading the 223, can do about anything with better low cost brass
Dinny, just aim a little low on them squirrels and knock the branch out from under them.
Be sure to bring a net

I didn't know they had 230 gr bullets for the .357. Thanks