I currently have a .45 longrifle with a 7/8", 42" bl. & it holds very well indeed, shooting offhand.
At one time, I also had a 42", .40 cal. Goodoien barrel for that stock and it felt even better than the .45, however it was just a bit too much for a bad back to hold up for 50 targets. It is now 38" and still shoots quite well on a short English styled 1/2 stock.
It was very solid and steady to hold though and if fired quickly, worked well on steel targets but was exceptional off bags on paper at 50yards - many 1/2", 5 shot groups - the first 3 would usually cut an\ slightly oblong hole, or merely a cloverleaf. IT would have been an exceptional hunting weight, plank or chunk rifle, I'm sure, having enough weight and front heaviness for good work from a rest.