QuoteI hope (and think) your .670 -.672 numbers are right. I was surprised when I saw the .687 on Remington's website. The way that choke performs I would have never guessed .687.
I found this searching and it does list it as .670 It's the choke at the bottom of the list which has the same # 301735 on my owners manual.
0373RCCHOKE TUBE 10 GA DECOY .765 (IMPROVED)$ 52.00F103805RCCHOKE TUBE 10 GA STEEL IMP MOD/LEAD MOD ~ .770$ 42.00F400374RCCHOKE TUBE 10 GA INTERMEDIATE .755 (MOD)$ 52.00F400375RCCHOKE TUBE 10 GA PASSING PORTED .745 (LT. FULL)$ 73.00F103806RCCHOKE TUBE 10 GA STEEL X-FULL/LEAD FULL ~ .750$ 42.00F103780RCCHOKE TUBE 10 GA TURKEY X-FULL LEAD ONLY ~ .730$ 42.00F94207RCCHOKE TUBE 10 GA WRENCH$ 11.00F98870RCCHOKE TUBE 12 GA EXTENDED RIFLED DIA. ~ .718$ 58.00F103795RCCHOKE TUBE 12 GA FULL--STEEL OR LEAD DIA. ~ .691$ 33.00F401501RCCHOKE TUBE 12 GA HASKINATOR (EXTENDED PORTED TACTIAL)$ 58.00F101585RCCHOKE TUBE 12 GA IMP CYL DIA. ~ .720$ 19.00F108261RCCHOKE TUBE 12 GA IMP CYL EXT SPTG CLAY NP$ 31.00F101590RCCHOKE TUBE 12 GA IMP SKEET DIA. ~ .725$ 19.00F108262RCCHOKE TUBE 12 GA LT MOD EXT SPTG CLAY NP DIA. ~ .713$ 31.00F101586RCCHOKE TUBE 12 GA MOD DIA. ~ .709$ 19.00F108263RCCHOKE TUBE 12 GA MOD EXT SPTG CLAY NP DIA. ~ .709$ 31.00F94650RCCHOKE TUBE 12 GA RIFLED N/S FLUSH DIA. ~ .718$ 40.00F101588RCCHOKE TUBE 12 GA SKEET DIA. ~ .732$ 19.00F108260RCCHOKE TUBE 12 GA SKEET EXT SPTG CLAY NP DIA. ~ .725$ 31.00F109737RCCHOKE TUBE 12 GA LONG HANDICAP .686$ 16.00F109736RCCHOKE TUBE 12 GA MID HANDICAP .693$ 16.00F109735RCCHOKE TUBE 12 GA SINGLES .700$ 16.00F300623RCCHOKE TUBE 12 GA (HEVISHOT) EXTENDED SUPER FULL .675$ 56.00F94516RCCHOKE TUBE 12 GA TURKEY EXT EXTRA FULL ~ .687$ 31.00F105930RCCHOKE TUBE 12 GA TURKEY EXT SUPER FULL ~ .665$ 32.00F306765RCCHOKE TUBE 12 GA WATERFOWL (FLOODED TIMBER) ~ .725$ 30.00F306767RCCHOKE TUBE 12 GA WATERFOWL (PASS SHOOTING) ~ .718$ 30.00F306766RCCHOKE TUBE 12 GA WATERFOWL (OVER DECOY) ~ .720$ 30.00F301735RCCHOKE TUBE 12 GA WINGMASTER HD EXTENDED TURKEY/PREDATOR ~ .670
