Haven't shot a match but have done some reading. I'm sure the guys that have the experience will be along shortly, but until then, instead of a Harris, check out one of these from Sinclain Intl. made specifically for F-Class, availabe in
Black: http://www.sinclairintl.com/.aspx/pid=33618/Product/Sinclair_F_Class_Bipod__Satin_Black_
or
Silver: http://www.sinclairintl.com/.aspx/pid=38190/Product/Sinclair_F_Class_Bipod__Satin_Silver_
I believe x-ring uses one of these? I know I have seen one of them pictured on a member's rifle here.
Black: http://www.sinclairintl.com/.aspx/pid=33618/Product/Sinclair_F_Class_Bipod__Satin_Black_
or
Silver: http://www.sinclairintl.com/.aspx/pid=38190/Product/Sinclair_F_Class_Bipod__Satin_Silver_
I believe x-ring uses one of these? I know I have seen one of them pictured on a member's rifle here.