Rem. 870 21 in. barrel ....Hevi-Shot .573 Choke....40 yds.....Federal TSS #9 I like the pattern of these shells. You could probably get a few more yds. out of it, but I like em at 40 and under ! So this is what the grandson will be using in his 20. I have tried several other shells and nothing compares to this....Good stuff !