MacD37,
Sir,
I wasn't speaking of theory, for nearly two decades I was the owner of a 577 BP Express double rifle retailed by E.M Reilly and Co, London. It was my experience that both barrels shot small groups together at 70 yards, (their regulation distance). At 100 yards the right barrel was shooting to the left of the POI and the left hand barrel was shooting to the right. The shots were even more widely spaced at 150 and 200 yards. Over the years I put more rounds through that rifle than I care to think about, I still get headaches, thirty years after I sold it.
In any case these large rifle calibres were meant to be stoppers at relatively close range, not long range hunting rifles.
Harry
