Help with these Baracuda Match .177 HnN

So my Father Dick Strever has these Baracuda Match .177 HnN pellets. These are marked with TM. < For TM/HM1000 > i know he usually marked his pellets according to which rifle they shot great out of. He had a few TM1000s, Anyways my question < cause i cant find them online anywhere > Are these good pellets? IF so how do i determine the Grain size also ? These are his unopen tins. and yes they are for sell if anyone is interested.
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