SRAM s300 cranks

46 sounds a bit large for a track wheelset seeing the 'standard' is 42.

Best bet would be to measure the chainline on the rear wheel as you physically have the wheel then you would know for definite.

From Sheldon;
Chainline Measurement-Rear (For bikes that do not use derailer gearing)
[INDENT]
To measure rear chainline:

• Measure the frame spacing (or the over-lock-nut dimension of the hub , which should be the same.) (Example: 120 mm)
  
• Divide the result in half. (Example: 60 mm)
  
• Measure the distance from the inside of the rear fork end (or the outside of the axle locknut) to the middle of the sprocket. (Example: 18 mm)
  
• Subtract the dropout-to-sprocket spacing (Example: 18 mm) from the half-over-lock-nut dimension (Example: 60 mm) to determine the actual rear chainline (Example: 42 mm)
  
  

[/INDENT]