Panthera Tigris,
1300s are nice guns. These fit me very well. I am so glad you actually chose the one that fit YOU. That means a lot to me.
Winchokes. I really really like the Winchokes. Now these may be an "older" design, may appear "short" when measured against others, I will share some of The BEST patterns come from those well thought out , very well designed, Win-Chokes.
External knurled- this will protect the muzzle if dinged. No matter how careful we are, muzzles do get dinged. One of these external knurled gets dinged, and bad, get a new external, less monies that having muzzle repaired. Internal chokes get dinged bad enough- one cannot get the internal choke out, and to remove proper is going to cost money, and still have to get muzzle fit.
Steel Shot Proof. Nice to have in the event you have to shoot Steel for waterfowl or a club that restricts one to non-toxic, and many may still mandate steel shot for this club rule.
Concentric. No shoddy quality control have I ever experienced or heard of with a Win-Choke.
Not expensive. Last checked, still one of the lesser priced chokes one can buy. I do recommend you get a Skeet if you do not have in the event you need to hunt quail, the 1300 with a skeet choke, even in that 28" barrel is great! Shoot some 00 buck out of it too, and check the pattern board, you may be surprised!
So I would recommend in having SK, IC, MOD and Full. Better to have and not need, than need and not have.
Winchester put a lot of research into the Win-Choke. Many folks never look at this or appreciate this older design.
I just always used RIG +P for thread grease, or STOS from Ponsess Warren.
We await your report on trying various loads at the pattern board, and your hat getting shot from running a straight at Trap with your new gun.
Sincere congrats!
Steve