I have a 1300 winchester and many,many chokes. You can buy full to superfull and beyond and spend 7.99 to over a 100.00 for them. All chokes arent made the same and they can be made with grooves, ports, circles cut in them, come in different lengths and sizes. Although the choke can make the difference, alot of it all depends on ammunition, shot type(material made from), size, even length of shell(shooting 3" in 3 1/2 " or 2 3/4 in 3"), etc. My friends 3 1/2" Rem. pump shoots 3" shells actually tighter with less shot than a 3 1/2 shell with more shot. Go figure. Anything and everything can have an effect on the pattern. Its a game of trail and error. You can only read about what others have tried and go from there. I have costly chokes and cheaper ones. The best one that general shoots all loads well for me turned out to be a Northwind brand choke I bought at Wal-marts on sale for $3.00. They had them on closeout, but they are an excellent choke. Couldnt ever find out who made them but I bought two and one will slightly outshoot the other and they are the same brand and type with the same constriction. My friend bought some for his Remingtons and they outshoot all his other chokes also. I have patterned many types of ammuniton and chokes and like I said it is just trial and error. I will recommend hevi-shot though. I as well as my friend and brother shoot it and it reaches out, patterns tight and kills fast. It will be more costly, but im a believer in it after comparing it to alot of different lead loads out there. I like the original Hevi-shot loadings and they use the Remington brand. I think Remington lost the license though if im correct. I didnt see it on the site or in the new 2006 catalogue. Just do your research first on shell types and try both of the chikes with your ammunition at the range. I generally test mine at 40 yards. Im sure you will see a diiference and be able to pick out the best for your gun.