Here is some information for your project.
#01111 is the long action prototype military rifle in 30-06.
#10170 is the long action prototype sporting rifle that is short chambered in 256 Newton, listed in the R&D log as being chambered in 30-06. I don't know who owns this rifle today, but it was once part of Bruce Jennings Newton collection and sold to settle his estate.
There are at least two other long action 1920 military prototypes, a rifle similar to #01111 chambered in 7x57, and a hybrid 1920-SMLE #1 MK3 chambered in .303 British.
The following are some that I've owned:
#1602 - in 250-3000, accepted on 03/12/20 and shipped on 03/15/20 to Smith-Winchester Company.
#2718 - in 250-3000, accepted on 04/17/20 and shipped on 04/20/20 to Weed And Company in Savannah.
#3949 - in 250-3000, accepted on 06/15/22 and shipped on 06/19/22 to Missoula Mercantile Company.
#4217 - in 250-3000, accepted on 05/19/20 and shipped on 05/20/20 to Colonel E.G. Delafield on a consignment account, whatever that was. Colonel Delafield returned it to Savage on 09/05/24 and it was subsequently logged as an "office sample" on 10/08/28. This rifle is listed in the R&D log as being a Model 1916, but is an early 1920.
#4633 - in 250-3000, accepted on 05/27/20 and shipped on 07/10/20 to E.K. Tryon Company in Philadelphia.
#10594 - in 250-3000, accepted on 06/17/26 and shipped on 06/17/26 to Harry Harrison.
#10659 - in 300 Savage, accepted on 06/28/26 and shipped on 06/30/26 to Simmons Hardware Company in St. Louis.
#10821 - in 250-3000, accepted on 08/17/26 and shipped on 09/25/26 to Albany Hardware And Iron Company.
#11427 in 300 Savage, shipped on 09/28/28 to Lou J. Eppinger.
#11920 in 300 Savage, shipped on 10/12/27 to John E. Larrabee Company.
#11926 in 300 Savage, shipped on 07/30/27 to Gere Woodrings And Company.
#12273 - in 300 Savage was consigned to the R&D collection on 10/02/29.
