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To put it in perspective, a 300 amp motor current means 60 electric room heaters' (the red glowing ones that dim your lights every time they kick on) worth of heat in the contacts of the contactor at 1ohm. 6 of those toasty suckers at 0.1 ohm...

99.999% chance you only have one way to check them, and that will not be pleasant or cheap. The equipment to check it out will buy you 10 contactors, at least.

Try to send it back, if not, sunk funds are irrelevant and buy a $30 replacement that's known good.
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