looking for info on springfield rifle , modification of the u.s.m1903 designed by Remington arms., in 303 cal. no official nomenclature. believed to have been made in 1941.- until sept. 1941. ser. # w184525

Welcome to the Remington Owners Forum Dave !!

It is probably a sporterized military rifle...as the Springfield Model 1903 was only chambered in .30-06 and .30-03.

The .30-03 was a short-lived cartridge developed by the United States in 1903, to replace the .30-40 Krag in the new Springfield 1903 rifle. The .30-03 was also called the .30-45, since it used a 45 grain powder charge...but the name was changed to .30-03 to indicate the year of adoption. It used a 220 grain round nose bullet. It was replaced after only three years of service by the .30-06, firing a Spitzer bullet giving the rifle better ballistic performance.