I haven't checked the Mouser catalog, but the mfr's datasheet should have minimum self-resonant frequency. From this, you can calculate the maximum equivalent parallel capacitance, then add this to a simulation model to see how it performs.
I suspect that you might have better success with a lower impedance filter. Are you trying to make one with unequal termination impedances (unterminated, in the extreme case)? I seem to recall this makes the inductance range across the filter more extreme, and also makes component tolerances more critical.