Ian,
BR shooters have known velocity and barrel length have little to do with accuracy for at least 40 years. Hence the short barrels on most BR rifles.
In general shorter is accepted as better. I've always been amazed by the accuracy levels achieved with some of the long, relatively slender barrels used by TR shooters.
Richard,
What did you have to give for the custom (oversized) quarter?
Don't feel too bad about not using iron sights. Optical sights have improved to the point that irons are no longer necessary! Really, to say "if you could do that with iron sights, that would be something" is much like telling a sprinter who has just run a sub 10 sec. 100, " Now if you could just do that with an anvil tied to your butt, you'd be a fast man." Regards, Bill