I've shot high power match rifles, not benchrest, but they're just as accurate.
How many rounds do you put through your rifle before you clean it. Or another way of putting it, how many round will you rifle shoot before it begins to lose accuracy.
Anywhere from 20 to 80. Some top ranked folks have shot match rifles for a couple hundred rounds and not seen any accuracy problems. Arsenals testing match ammo put a couple hundred rounds through a test barrel in one test; great accuracy.
How many fowling shots does it take for your rifle to settle in?
Zero. Stiff or whippy barrel; makes no difference.
How long do you wait between shots for a 5 shot string.
15 to 30 seconds. Even for a 30-shot string; no accuracy problems.
US Navy Distinguished Marksman Badge 153
Former US Navy & Palma Rifle Team Member
NRA High Power Master & Long Range High Master
NRA Smallbore Prone Master