Do you have it covered?
17 HMR
Ruger .204
.243 Win
7MM RM
.338 WM

I'm guessing that you're just wanting to know if you have any gun you'll ever need for for anything that you possibly could hunt on North American soil. No.. Too Many Gaps
Atleast consider the following
1-3 22lr - (honestly.. who doesn't like shooting a 22?)
1-2 12 ga shot gun
1 20 gauge shot gun
1 30-06 or 270 win (IMO they're kinda the staple for big game rifle cartridges)
45-70 or similar lever action (Have a marlin guide gun and love it)
50 cal ML
1 personal protection gun - 9mm or larger
Those will give you a good start. I would definately start with a 22 (marlin or ruger) and 12 ga (Mossberg 500 or Rem 870 are great all around) and 50 cal (Wolf models are great and don't cost much). Personally this is what I have

.177 Tournament Pellet Rifle
Marlin 22lr
Ruger 22lr
Browning 22lr
Rem Pump 22lr (bought the day before pearl harbor was bombed by my grandfather and will out shoot every other 22 I've had)
Chipmunk 22
Marlin 22 mag
Savage 17hmr
Ruger 270 win
Rem 243 win
Puma 357
Marlin 45-70
NEF 12ga
Winchester 20ga
Stevens 12ga
Rem 870 12ga
Rem 1100 12ga
rem O/U 12ga
2 CVA Wolf 50 cal
Cva Optima 50 cal
Hawkin 54 cal
white mountain carbine 50 cal
kentucky rifle 45 cal
cherokee 32 cal
3- smith and wesson 357s
Glock 10mm
1 Rolling block rifle in 32rim (need ammo)
1 ww2 mauser carbine (need ammo)
5 .32 cal ww2 era pistols

I figure if I get them all cleaned up I may be what I conder covered but then theres also 223s, 22-250, 300 win mag (on layaway), 338, 375 h&h, 458 win, and 50 cal bmg. The last one will probably never happen but I saw em at the gun show this weekend and just think they would be cool as hell to have.