does anyone have one of these .223 chamber e. r. shaw barrels and can you tell the difference in accuracy between the shaw 223saami chamber any other barrel with a 5.56nato chamber?

I only care about accuracy.  

barrel in question would be NOT chrome lined 4140 chrome moly 1/9 twist.

are shaw barrels acceptably accurate?  would the differences in chambers 223 vs 5.56 make any difference for a shaw barrel?

Glock, I've had two Shaw barrels (7MM-08) and & (7MM). Neither one was particularly accurate and one was drilled out of concentric. I wasn't impressed and replaced both with Douglas premium air guage. Just my 2 cents. I don't think they're top of the line.
Midlength

the goal was to find a barrel with greater potential accuracy, if this could be done for less money then even better, I found a model1sales ershaw barrel with a the options of 5.56 chamber or 223 chamber and the 223 chamber supposedly gives greater accuracy but if the shaw barrels are that bad then a 20" WOA with 223wylde chamber or 20" rock river with 223wylde chamber look like the best choices

I have read that model1sales sells lower quality parts.

As I recollect, Shaw barrels are basically for hunting rifles, not precision.  I do have a 20" fluted ss and it will do moa, but that's about it.  Just my experience from searches and one barrel.