18.5" Barrel Turkey Choke Optima HP

[M1KL83]

Good day, recently  bought a Beretta 1301 Tactical w Optima HP choke thread. I'd like to double it as a turkey gun. My understanding is that the Optima HP barrels prefer tighter constrictions, especially so in the shorter barrel variety.
Anyone here pattern a Beretta 1301 for Turkeys yet? And/or what are the SBS 18" barrel guys using for their turkey chokes?
Ideally I'd do a straight comparison at the range of several of the choke brand tubes at varying constrictions (.650 - .670) - Sumtoy, Indian Creek, Rhino, Jebs,  PatternMaster etc but that will get quite expensive quite quick, especially with shipping to me in Canada.
Plan to use Long Beards #5 or #6, whichever perform best.
I do have healthy stock of Winchester Double X #6's but I think I'll upgrade to the Long Beards this year.

Thanks in advance for any and all advice, suggestions and experience you can share.

Cheers,

Mike

[SumToy]

665 to 670 should work fine.   

[Old Timer]

 I have the beretta A350 and uses the optima hp choke. used redhead .680 and did fair with lb 1 5/8 oz #5. Shot the kents 1 7/8 oz #4 a little tighter. Even pattern but not as tight for my liking. I would go with a .670 or tighter. Just my 2 cents. Good luck and keep us posted.