>>64067597
>I heard the standard bullet weight for 1903s was 150 gr so I was expecting that to be best.
The M1903 was initially adopted in .30-'03 with a 220gr round-nose bullet just like the Krag used. The rifling had a 1:10" twist and it didn't change with the switch to 150gr .30-'06 or with the adoption of 173gr M1.