Well, I managed to do the bullet tests today. Most of it went quite well. Cloudy with temp at +1C. About 3 - 4" snow on ground. Will send some pics to Sir Ron later. Black aiming dots (black marker) on end of box looked like the five on dice. Range to box = 10 ft. Box length = 19". Total weight = 50 lbs. Fired in this order:
2nd dot bottom left = 600gr BO/missed box low , knew it would shoot a bit low because sighted for the 250 MF, but also the separation between bore and scope.
3rd dot upper left - 550 Woodleigh/ 1685 fps/ Penetration = 5"/ expansion .82"/ wt retained = 351gr - 64% (There were 2 small pieces next to the bullet. Total = 429 grs.