I have the Revised Edition No. #37 official rule book from Sept. 2008. Is this the most recent NBRSA rule book or is there a more recent edition? I'm intereste in knowing what the rules are concerning clamping a block to the bench to keep your front rest from moving. I see people clamping blocks to the bench on the rail guns but never on the varmint guns. The #37 rule book indicates that blocks are not appropriate for the rails. P. 15 "Neither the unlimited rifle nor the unlimited rest/s may contact anything that is affixed or clamped to the bench." Has this rule been recently changed? What about the varmint rifles? In the #37 rule book there is nothing about clamping a block to the banch and pushing against it. What say you?