I shoot off my cheap Harris bi-pod and still get .25-.5 MOA all day long. The reason is understanding and EXECUTING rifle basics. My friends and I laugh when these guys have a mountain of sandbags and show nice accurate groups. That's great and all, but pick the thing up, move 2 stations over and execute that 3 shot group again in under 2 minutes.
I'm only "cocky" about this because I spent a lot of time, training and practicing my craft and hate when folks try to throw stuff in the face of friends and myself. The other test for them is to execute that shot on demand, not holding position for minutes and only firing the shot when absolutely comfortable, with ideal wind, barrel cool, etc.
Enough of the rant though.
The vices and racks and crap are good (I suppose) for load testing, but a well built rifle will 1 hole all day long. So, develop good shooting form and technique (grip, stance, trigger control, etc.). Then, take it to the range. 10/22's are great for this. You can work out any issues or try new techniques and then move over to the bigger bullets after you've got them worked out.
Hope that helps.
SPC Richard A. White, Senior Medic
249th MP Detachment (EACF)
Camp Humphreys, ROK