I remember ready an article in one of the popular outdoor magazines many years ago. They were testing the point of aim as the barrel heated up. From cold to hot the POA changed by 8 inches. I can't remember the distance they were shooting at or the gun but it was a single barrel gun. Wonder if that can be repeated and it it has any effect on double guns?
I would like to read that article if you ever run across it again, Tamid. I'd be willing to bet it was a ribbed barrel on which the rib was "hard fastened", and not floating.
I could not tell any impact shift on my Beretta 687 SPII Sporting 20 ga. in Argentina. I would shoot hard for three hours at a time, averaging a round every 6.7 seconds, according to shell count. That is purely anecdotal, but if there had been a big impact shift, and I call 8" big, I think I would have noticed something amiss, especially on incomers at 12 o'clock.
SRH
