I have been shooting vintage military rifle matches since 2000. Before that I just carried and used USGI rifles for hunting, recreational range shooting, etc. I've found that the 1907 sling is just about perfect for use at the range or in the field. I've had some that after a year or two of use were in pitiful condition. I've got one on my current 03 match rifle that is still going strong after 11 years.
I would suggest you buy the best grade of leather sling you can find. I have been very pleased with the slings I have purchased from Turner Saddlery. Below is a link to their site. There you can do some reading and find the sling that will best meet your needs. Take a look at the National Match seconds. I bought a couple of these for use w/ my M-1 rifles. I have found them to be excellent in every respect. HTH. Sincerely. brucev.
Welcome to Turner Sling | turnersling.com
NM Sling Seconds - Turner Saddlery Inc