I am not sure it's so much a matter of "more is better"......rather, it's more why a .357 gives anything a 30-30 cannot already do.
The OP's statement on the matter helps to explain.
Here's the problem, quote:
"If I go with a larger bore it feels like if I'm limiting myself in range, it's ok because I have a hammer behind me."
Presumably he means if it's range limited the larger caliber at least makes it hit harder. What's mystifying is why, exactly, one would judge a .357 as hitting harder when in fact it shoots bullets no heavier than a 30-30 at somewhat slower velocities?
In comparison to a 30-30 I'd hardly classify a .357 as being in the "hammer" category. That's giving five hundredths of an inch of bullet diameter way too much credit.
His desires are (somewhat) clearly expressed....the ability to attain them is questionable given his stated alternative (the .357).