After much googling
I found information the the M1 Garand spring
M1 Garand recoil Spring
Proper length is 19 3/4 to 20 1/4" when new.
between 16.75" and 17.75" with 5 lb weight
between 11.75" and 12.75" with 16 lb weight
1005-614-7568 SPRING, HELICAL, COMPRESSION: . S, 0.0562 max stk dia, 0.384 max free od, 20-1/4 free o/a lg, 200 total coils , operating rod (6147568).
--------------------- Wolff Spring--------------
I have counted the coils on a new Wolff spring
200 coils 0.056 dia 21-1/8 long outside dia. 0.378
# coils correct ...dia of wire correct..... outside dia 0.006 smaller
So wolff spring is .875 too long but everything else matches .... try spring and see if it works before cutting