Some good points here, I though have never been of the view that "If the Govt send me to kill an enemy in war with this cartridge that makes it ok to hunt deer with" point of view. In my opinion there is no such thing as overkill and I consider even the 7.62 x 39 and the 30 30 to be marginal on anything outside of close up 50 yards woodland shots!
It is your conscience after all, that and the 3 hours blood trailing.
I disagree with the marginalization of the 30-30 cartridge/rifle.
It seems that on the internet, it is popular to discredit this rifle cartridge.
Usually by persons whom have never taken the time to improve sights on factory rifles,
or spend any significant amount of time with them at a rifle range before purposefully using them for big game season.
My harvest with a peep sighted Winchester 30-30 Carbine (circa-1956) was at 260 yards on Nov'2005. (high sight-in on purpose)
Deer was more than 3/4s facing me, I held for his white-throat patch and into the 'boiler room' the 150 grain silvertip RN bullet went.
Deer fell dead almost immediately after the shot striking it in the chest, two inches left of centre.
I take it, most British or European hunters would not use a 30-30 rifle or carbine by choice for deer hunting?
That's fine too, but don't believe for one second, this old cartridge cannot get the job done on deer, with proper ammunition, in the right hands.
This just takes a little more time at a rifle range, getting to know one's bullet impact at differant ranges.
I got to the point myself of 200 yard offhand shooting, striking a 10 inch gong, with a 90% success rate.
Cheers........