Help with an M2 tube

[Life of Riley]

I'm looking for a choke for my M2 28" 12ga. I prefer non-ported due to noise reduction and my belief that porting has no major effect on shotgun/shell performance. I'm open to any suggestions, and I've just been reading old threads on this sight for the last hour! Oh, most importantly, I'll be shooting 3 inch Winchester longbeard XR's, probably 6's. I most likely will take other shells with me when I go to the range, but am looking to pick just one and zero my red dot with that particular load. I hunt the upper midwest and lots of ag fields and open prairie.

[taylorjones20]

Non-ported = Rob Roberts .660

[mightyjoeyoung]

Carlson's. ..

[Swamper7]

Im shooting a non-ported carlsons .675 out of an m1 getting a very even hunting pattern with lb 6s

[BINK McCARTY]

I'm looking for a choke for my M2 28" 12ga. I prefer non-ported due to noise reduction and my belief that porting has no major effect on shotgun/shell performance. I'm open to any suggestions, and I've just been reading old threads on this sight for the last hour! Oh, most importantly, I'll be shooting 3 inch Winchester longbeard XR's, probably 6's. I most likely will take other shells with me when I go to the range, but am looking to pick just one and zero my red dot with that particular load. I hunt the upper midwest and lots of ag fields and open prairie.

I have a non-ported Roberts Final Strut .640 if you might be interested.