Ive had same scope setup on my RWS 48 .22 and have been shooting it for 7 yrs and approx 7,000/10,000 pellets and have never had poi shift unless I chose to move scope settings.. alot depends upon quality of mount/rings and scope you use.. if you to to get by with a marginal airgun rated scope(cheap) then 8-10 times you will end up with poi shifts. I have no trouble maintaining zero on my 12 other springers of which 3/4 are all break barrels.
I agree with Brazos if your under 50 you might get by shooting open sights but not over 50 unless rare exception. I haven't been able to shoot open sights very well since about 47, while still can hit stuff just not near as consistent.
