This book:
https://www.riflemagazine.com/catalog/detail.cfm?productid=1655
Has a magazine article from 1977 on "Slicking the Savage 99".
5 of the 7 pages are on trigger improvement.
In that article it says, "Unfortuenatley, the trigger and sear engagement at point "C" is concealed in the receiver recesses, so adjustment of the sear notch is something of a trial and error proceedrure..."
Here is a 1917 250 Sav take down I saw at a gunshow for $200. I dickered them down to $175.
I bought a Shilen stainless select match 6mmPPC take off barrel for $75 on Ebay, 5.1 pounds 21.5 inches long [ bull barrel].
I drilled and tapped the old Sav 99 receiver using a later model Sav 99 as a pattern.
I cut Sav 99 square threads on the barrel and milled the 3 breech cuts.
I chambered the barrel for 6mmBR.
The rifle weighs 9.5 pounds without scope or rings.
I took it to the range and fired a few groups.
With an
8 pound trigger it shot a 0.1" 3 shot group at 50y and a 0.3" 3 shot group at 100y.