Have you checked POI with your 26" IC/M set of barrels?

POI was checked and there’s no issue

If the POI is hitting where your aiming, your .007/.018 chokes are, at least in my experience, sufficient and effective at any reasonable distance for a 28ga. with proper loads for the upland bird hunting I do.

If it were me, I would do a quite a bit of target shooting, i.e. skeet, 5-stand and sporting clays before giving up on them.

My issue is not with the 26" IC .007/Mod .018 chokes, but the 28" Mod .020/Full .045 chokes and, yes I've shot about as much clays as possible to figure this out too.

Tom, the above is what you wrote. I've read and re-read it several times, and each time I read it I come away understanding you "can't hit anything moving or stationary (slight exaggeration but not far off) with the IC/Mod barrel, but I hit almost everything with the 28" M/F." (The words in quotations are your words, not mine). I thought it was the IC/Mod set of barrels you couldn't hit anything with, I'm sorry if I misunderstood.

Don't need to be confusing. I still can't hit anything with the 26" IC/M. with the gunsmith's assistance I believe the IC/M barrels are choked correctly and there's no issue with the POI. Also had the gun stock measured and compared to my 20ga. Repro and found the 28ga. stock measurements to be similar to the 20ga. As my father always told me about my shooting ills that "its not the arrow but the Indian".

Since I hit more clays and live birds with the 28" M/F barrel than the 26" IC/M my gunsmith has summized that my shooting technique is different with each barrel. It seems I swing faster and not as smoothly with the shorter barrels than with the 28" barrels. The added weight of the 28" helps my swing too. I am having the 28" M/F barrels opened up to more conventional 28ga. chokes of .013"/.027" than the current chokes of .020"/.045. I'll be keeping the 26" barrels in the case.

Man, I wish I had a set of barrels for you. I am in the opposite camp, I would really like to have a tight choked set of 28" barrels to turkey hunt with. It pains me to hear this....

What’s the ‘I’ stand for
 

28 gauge DHE Parker Repro. Barrels match. Can’t figure out what the stamped ‘I’ is. Anyone?

The "I" stamp meaning has been brought up several times in this forum. Like, Mr. Spencer, had responded previously to you-- no one seems to know. Here's one of those threads where it's been brought up before: http://parkerguns.org/forums/showthread.php?t=5012