Richard McCormick: Tenelick

My ancestor Richard McCormick b. abt 1798, emigrated in 1826.  Family story involves him surviving a shipwreck on the way to America.  I have searched every passenger list I can find, every newspaper site in the US, and spoke with an Irish expert at the FHL in Salt Lake City.  I have narrowed it down to a ship named "Nassau" that wrecked on Sable Island in May 1826.  Almost all passengers were Irish, on their way to Quebec, and were rescued- taken to Halifax, Nova Scotia.  I have not found anything specific to tie Richard to the Nassau other than it fits all the details of the story I have.

My question: Is there a place that I could search Irish newspapers from the 1826 time frame for possible mentions?  Any ideas of where to look for mentions of Richard leaving Co. Longford for America?  I'm going to be in Ireland for the summer and have archives in Dublin and Belfast on my itinerary as well as a stop at the main library in Longford.  Suggestions greatly appreciated.  

Other details: I believe Richard's parents were Richard McCormick and Catherine Clyne.  Richard married Ann Hamm (also from County Longford) probably in the US around 1831.  Their first child, Margaret, was baptized in Manayunk, Pennsylvania in 1832.  The family was in Western New York by 1835 when they purchased property there.

Thank you!