Perry touched down twice as rampant Saints crossed nine times to pile on the misery for the Tigers.
Another forward, Joe Greenwood, also scored two as the Tigers put up little resistance on their way to a sixth successive loss.
Mark Flanagan, Louie McCarthy-Scarsbrook, Tommy Makinson, Adam Swift and Jordan Turner also claimed tries, while Makinson added six goals from nine attempts.
Daryl Clark, Justin Carney and James Clare were the try-scorers for Cas.
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