Sorry if I offend anyone, but here's my 2 cents (if it's even worth that):


1.243 Win -- deer only. not appropriate for elk & moose, IMO.
2.257 Weatherby Mag -- deer, maybe elk. probably not for moose.
3.257 Roberts -- deer. probably not forelk. not for moose.
4.25-06 Rem -- deer, maybe elk. probably not for moose
5.264 Win Mag -- bullets are probably on the light side, but it's a better choice for elk & moose than any of the 25s, IMO
6.270 Weatherby Mag -- OK for all three, though probably not ideal for moose.
7.270 Win -- deer, fine. elk, ok. moose- would prefer a bit more.
8.Good "Ol" 30/30 -- love it for deer. maybe ok at close range for elk and really close range for moose, though I'd prefer more oomph.
9.260 Rem -- I'd recommend for deer only, same as .243
10.270 WSM --OK for all three, though probably not ideal for moose.
11.280 Rem --about the same as 270 win: great on deer,maybeso-so on elk,not quite as much as I'd like for moose.
12.7mm Mauser -- deer, fine. elk, maybe borderline. moose- would prefer a bit more.
13.7mm-08 Rem -- deer, fine. elk, a bit light.moose,I'dprefer more
14.7mm Rem Mag -- This is probably the 'threshhold' cartridge where I'd be OK with it for all three. Probably better moose cartridges available
15.308 Win -- great on deer, ok on elk, could probably get by with it on moose.
16.30-06 Spfd -- has probably taken PLENTY of all three species, though maybe not ideal for moose.
17.300 H&H Mag -- all of the 300 mags are probably ok for all 3 species, IMO
18.300 WSM
19.300 Rem Ultra Mag
20.300 Win Mag
21.300 Weatherby Mag
21.325 WSM -- good all-around choice
22.338 Win mag -- THE round for elk and moose?
23.375 H&H Mag -- seems like alot of recoil to deal with to shoot a deer. great for the big 2, though.
24.7mm WSM -- see 7 rem mag
25.338 Federal -- maybe ok for all three, albeit atsomewhat closerranges for elk and moose.
26.7mm Weatherby Mag -- ditto the other 7s.
27.30-378 Weatherby Mag -- at $5 a round, I'd probably invest in a smaller cartridge for deer.
28.340 Weatherby mag -- for deer?? although I don't believe in 'overkill' (dead is dead) I probably wouldn't swat flies with a post maul, either.
29.50 BMG -- seriously? have fun carrying it around.
30. 6.5 X 55 Swedish -- seems light for moose, but from what I understand, the Swedes use it all the time.