I have a 3" 20 h&r I'm considering having machined for threaded chokes for a light weight turkey gun. My question is how do you determine the type or model choke prior to having this done, since you buy a choke based on the mfg. of the shotgun? Would you have it cut as a Remington, Moss, or what since H&R's didnt come with threaded barrels? I hope this makes sense to you