Bi-pod versus 15" sand bag?

[IDbound]

I am looking to improve my long range shooting skills, initially from a concrete bench. I have a non-Harris bipod that allows the gun to "jump" when the gun is fired. Thus I find myself holding the gun down to limit jumping and not being happy with my accuracy. I am wondering if the 15" long X shaped shooting bags that cradle the gun would work better on hard surfaces. Any suggestions??

 

[ICANHITHIMMAN]

Let it jump it wont effect anything at all. I use a back pack as a rest for almost every situation in have incountered.