I use many different pieces of glass
2-24X Mitchell Optics (an improvement on the Unertl)
6-24 Leupold Varix III 1" tube
8-25 Leupold Varix III 30mm Tube
4.5-14 Leupold M4
5.5-22 NXS
6-24 B&L 4200
8-32 B&L 4200
The Mitchell's are on a 6br and a 284 and are my most used rifles. The scopes are sequencial serial numbers. Objective dia. 2.5", tube 1", OA length26.25", weight 3.25 lbs. These are awsome sopes.
The leupolds are on a 6.5x55 and a 243 WSSM.
The M4 is on my 308 Tactical.
The NXS is on a 338LM.
The B&L's are on my varmit rifles. I don't use these for competition due to the limited elevation that they have. After 300 m you need tapered bases and this can be a pain.
When I started shooting F Class I use a Tasco Varmit 6-24 with no problems on top of a 30-06. I shot that combination for 2 years with no malfunctions. You can spend as much money of glass as you want.
IMHO
Don