Lets start with a couple assumptions:
1. The Rams will complete 360 passes in 2017. (Last year the Redskins completed 407 passes while the Rams completed 312: 360 is kind of in the middle.)
2. The following potential receivers will see playing time with the Rams in 2017, either as part of the initial 53, added to the roster after suspension, or called up at some point as an injury replacement: WRs Watkins, Woods, Kupp, Austin, Cooper, Reynolds, Spruce, Thomson; TEs Higbee, Everett, Hemingway; RBs Gurley, Brown, Green, Davis, Rogers.
OK - here's my stab at it. (Give it a try, but make sure combined catches for the team is 360)
Watkins - 61
Woods - 45
Kupp - 52
Austin - 44
Cooper - 10
Reynolds - 14
Spruce - 3
Thomas - 7
Higbee - 34
Everett - 24
Hemingway - 5
Gurley - 48
Brown - 2
Green - 3
Davis - 4
Rogers - 4
AlbaNY_Ram