Hi Paul and welcome. For me, Modified chokes tend to pattern 00 buck best. The exception is when using my preferred load, Federal 00 Buck with the "Flite-Control" wad, which patterns extremely tight through Cylinder chokes as by design of the wad. I would still suggest you pattern your specific shotgun for your best results. Cheers, stay safe and enjoy.

For “00” buckshot, an Improved Cylinder (IC) or Modified (MOD) choke is typically your best bet.

For standard 00-buckshot, an Improved Cylinder (IC) or Modified (MOD) choke is generally the best starting point. This constriction allows the pellets to safely pass without excessive deformation, yielding the most consistent and manageable patterns for a magazine-fed shotgun like your Boss25.The perfect choke largely depends on your specific ammunition and intended purpose:Best Chokes by Use CaseHome Defense (Close Range): Use a Cylinder (CYL) or Improved Cylinder (IC). Open chokes are highly recommended if you are using specialized ammunition with FlightControl wads, as tighter constrictions can actually ruin the wad's performance and widen your pattern prematurely.Hunting (Medium Range): Use a Modified (MOD) or Full (FULL) choke. If you are not using wad-restricted ammo, a tighter choke will keep your 00-buck pellets grouped more tightly together at longer distances.Slugs: If you plan to swap out your shot, stick to Cylinder (CYL) or Improved Cylinder (IC). Tighter chokes can damage your barrel when shooting slugs.Tips for the Citadel Boss 25Factory Inclusions: Your Boss 25 typically ships with a full set of five chokes: Cylinder, Improved Cylinder, Modified, Improved Modified, and Full.Ammunition: The Boss 25 is a semi-automatic, magazine-fed shotgun that usually requires high-velocity ammunition (1300+ fps) to cycle properly. Low-recoil or tactical loads may occasionally result in cycling issues.Patterning: Shotguns pattern very differently based on the exact manufacture