I was able to purchase hickory nut meat locally. Hand picked out hickory nuts. The meat is clean and free of shell particles.
When I was growing up we would pick hickory nuts by the ice cream pail full, dump into 5 gallon pails and then into feed sacks.
During the winter all these feed sacks were cracked by hand and the meats were picked out. It was and still is alot of labor.
Hickory nuts will keep an unbelievable amount of years if frozen in quart jars. 50 years? Keep them frozen.
I put some in jars and vacuum sealed some and gave the same amount away to family.