Relevant changes for this year:
6) 5B1 Base class rule change for a hard $350 for specific model of rifle. Also allowing mods to the barrel channel and bedding.
This means that the specific model number (i.e. 1151) you have must be under $350 MSRP. Not the whole series (i.e. Ruger 10/22).
1. Approved Base class rifle list:
Ruger models: 10/22 Carbine (1103, 1151, 1256 models)
Savage models: Rascal FV—SR, B22 F Compact, 822 F Left Hand, Rascal Target, 64 FL, 64 FL XP, Rascal, Rascal Gator Camo, 64 FV-SR, Mark | GY, Mark II GY, A22, B22 F, Mark II FV-SR, Mark II FXP, 822 FV, 822 FV—SR, Mark II FV-SR Gator Camo, 64 F, 64 FXP, 64 G, Mark II F, 64 F Camo, Mark II FV, Mark II G, Mark II GL, Mark II GLY, 64 FSS, 64 FVXP, Mark | G, Mark II Camo, Mark II FVXP, Mark II FSS
Marlin: XT-22, XT-22R, XT-22RO, XT-22RZ, XT-22TR, XT-22TSR, XT—22VR, XT-22YR, Model 60, Model 600, Model 6088, Model 6OSN, Model 6038, Model 70PSS, Model 795
Mossberg: Blaze, 702, 801, 802
Remington: 597, 597HB
2. Excluded Base class rifle list:
CZ 455
I've asked about the CZ 455 exclusion before:
The match directors across the nation agreed that the CZ455 doesn't fit in base class since only 1 model barely makes the MSRP rule.
According to my (limited) research, the Scout is the only CZ455 model that has an MSRP of $350 or less. As noted above, last year any rifle in a series that had a MSRP of $350 or less, made the whole series eligible for base class. If you allowed the CZ455 last year, there would have been a slew of higher priced CZ rifles in base class. I suspect that the across-the-board CZ455 restriction is a carry-over based on that fact.