Is the pipe supposed to bottom out in the bell for solvent weld joints?
Normally no, unless the pipe and bell are at their tolerance extremes. The bell socket is tapered to allow for pipe diameter variances. Typically, the pipe will bottom out at 1/3 to 2/3 of the socket depth. If the pipe does bottom out, the fit should be snug for a good joint. (Refer to ASTM D2855 Section 7.