While out blasting away yesterday, I also shot some more of the Federal HW #7's out of 4 chokes from IC. They were .540 and .545 ported and non-ported chokes.
These were all shot at 40 yards (taped) and 82 degrees outside with 12mph winds. I think I've finally found the choke that will be sitting on my JR

Here are the numbers I got yesterday.
.545 Non Ported 147 hits
.545 Ported 121 Hits
.540 Non Ported 103 hits
.540 Ported 92 Hits
Here's the .545 Non-ported

For grins, I fired one down the Rem SF choke that had been the leader out of this gun. I have gotten anywhere from the 180's to 200's with these shells out of the Rem choke on a good weather day!
Yesterday it could only muster 126 hits. Still a very good choke for the money, but I think it just got passed as the choke to be on my JR.

I was pretty shocked at how much the weather had made a difference on shooting. When the winds calm down, I'll be back out testing some more!