Re: 1903 Springfield and Winchester 1917
No, the RIA low-number cutoff was 285500; Springfield Armory was 800,000 (approximately)
I concur with the comment on sporterized military rifles. While those appear to be very well done, the fact is that they are probably worth less than the unaltered military rifle would have been. But since they can never be feasibly "restored", I would WAG those at about $450 for the M1903 and $400 for the M1917 unless, as noted, the work was done by a noted gunsmith or the rifles belonged to a prominent person.