im going to copy these VERBATUM out of several books mainly a book i picked up at a local gun show called "One book/one caliber   The complete reloading manual for the .30/.40 krag" i hope they help, really the only one ive ever used out of these is the 220gr round nose because as im sure anyone here will tell you, the round nose bullets work the best without getting jamed from the magazine... PLUS the 220 is one of the two (from what i understand [and ive been known to be wrong around here]) bullet types used by the military.  NOTE this is not mentioned by the book and i dont recomend changing anything that the book says unless youve got some experience with reloading and understand what the implications of changing any factor of a load....but i often use Spitzer loads for round nose bullets since a round nose load is often not available, but remember that a round nose bullet has more contact with the barrel and will result in more friction and slightly higher back pressures so keep the loads on the mild end of the spectrum (especially since we're dealing with 100++ year old guns here)
ALSO loading info for Winchester bullets is scarce since everything you find is useing winchester powder (makes sense doesnt it) so you wont be finding any loads for "winchester" bullets here, but the best way to fix that problem is break out the magic marker and rub out "winchester" on the box, then they aint winchester bullets no mo (this isnt a terriable problem since i often buy bullets in a bag at the gun shop and who knows who made those)


LOADS FOUND IN
"Speer Relaoding Manual 9"

150gr (spitzer) bullet     IMR4895
    42.0gr     2493Muz.Velo.    
    40.0gr     2363Muz.Velo.
    38.0gr     2272Muz.Velo.

180gr (spitzer) bullet     IMR4895
    39.0gr     2207Muz.Velo.
    37.0gr     2099Muz.Velo.
    35.0gr     1976Muz.Velo.

LOADS FOUND IN
"Lyman Reloading Handbook"

150gr (unspecified-jacketed) bullet     IMR4895
    MIN     41.0gr     2415Muz.Velo.
    MAX     45.0gr     2590Muz.Velo.

180gr (unspecified-jacketed) bullet     IMR4895
    MIN     38.0gr     3132Muz.Velo.
    MAX     42.0gr     2375Muz.Velo.

220gr (unspecified-jacketed) bullet     IMR4895
    MIN     36.0gr     1992Muz.Velo.
    MAX     40.0gr     2183Muz.Velo.

LOADS FOUND IN
"IMR Powders loading guide"
NOTE:i have a sneeking suspision that these loads were created with cast bullets in mind judging by their VERY conservative figures

150gr (unspecified) bullet     IMR4895
    MIN     40.0gr
    MAX     42.0gr

180gr (unspecified) bullet     IMR4895
    MIN     36.0gr
    MAX     38.0gr

220gr (unspecified) bullet     IMR4895
    MIN     31.0gr
    MAX     33.0gr

LOADS FOUND IN
"back of bathroom stall door"
(JUST KIDDING really found in "Sierra Relaoding Manual")

220gr (round nose) bullet     IMR4895
    32.0gr     1800Muz.Velo.
    34.1gr     1900Muz.Velo.
    36.2gr     2000Muz.Velo.
    38.3gr     2100Muz.Velo.

NOW for some discussion, i was unable to locate any loads for a 120gr bullet (and i have many books to look at)  BUT my educated guess, by useing the median of the 110gr load and the 130gr load  which would put you at about 42gr or 43gr NOW REMEMBER i didnt say thats what came from a book and im not saying thats what you should use, but since ive never heard of a 120gr .30cal bullet we're kinda shooting in the dark, and if i happend to come across a literal ton of them for free, thats the point in which id start...  i hope this helps, HAPPY SHOOTING