Howdy, and welcome!

I regularly shoot 165 gr Hornady Boattailed Spitzers in my 1898 Krag sporter, and until last year in my 1898 Krag rifle.  I always load my 165 gr bullets with IMR-4064 (along with my 150 gr FMJ bullets for my Garand, and 174 gr FMJ bullets for my Type 99 Arisaka) with great results.  For my 165 gr rounds, I use 38.6 grains of 4064 and CCI standard primers, which according to my Hornady charts is around midway between minimum and maximum loads... and averages around 2200 FPS.

If your Krag is a full length rifle, you could always shoot 220 grain bullets, which is normal for the Krag.  I load my rounds with Hornady 220 gr Round Nose (jacketed) bullets over 40.0 grains of IMR-4350 and CCI Magnum primers.  40.0 grains of 4350 with a 220 gr RN is approximately equal to the original US .30 Caliber load (220 grain cupro-nickel jacketed bullet and 40.0 grains of Laflin & Rand powder).  Velocity is right around 1950-2000

I've never used Varget, so I don't know how it compares to 4064 or 4350... but I'm sure that others on this forum have and will have some good input for you.  Either way, post some pictures when you get your Krag so we can all be envious! 

Happy shooting...