Myself & another shooter recently started using the Cabela's portable shooting table & bench cross sticks at our YCSA matches for both big bore BPCR & 22BPCR.  Technically, according to the strict, un-waived NRA Silhouette Rulebook, any table is illegal. However, our matches are not NRA sanctioned matches & we have decided to allow the use of a table & bench cross sticks to allow those with physical issues shooting prone to participate.  We both evaluated the folding tables listed below & prefer the Cabela's table which is slightly taller & a little longer.  If you decide to use a table, a set of bench cross sticks & a stool will be necessary.

https://www.cabelas.com/p/cabelas-folding-shooting-table

http://tiny.cc/qbbb101

Wayne