I used a steel adopter that would chamber 32 ACP or 32 S&W short, both are accurate at short ranges. Now I have an adopter for 32 S&W Long which has increased the range and still accurate. The 30 M1icon carbine adopter has problems because of the bullet weight and twist of the 1903 barrelAttachment 85104Attachment 85105Attachment 85106Attachment 85107