Large quantities, I think about 50,000, MLE's were issued with front sights that were physically centred, but which shot about 18" to one side at 400 yds! The fact that this defect was not caught earlier, I think, must say something about both the testing methods employed (the difference between accuracy and repeatability) and the implication that the value of long range musketry with the emerging smokeless powders had not been fully appreciated by the British army. Their methods and training had not fully adapted from an age where arms were impaired by fouling and you could often not see the enemy from the front lines after the start of the battle.
Not long before the second Boer War the British were still using black powder cartridges. As it had in days of muzzleloaders, black powder made the battlefield visually impenetrable after a few volleys. There was no point in training soldiers to hit targets 1,000 yards off using individual fire when you could rarely see that far. So the tactics of the murkey battlefield still survived to some extent. Men lined up in rows firing volleys in the expected direction of the invisible enemy. Magazine cutoffs were to prevent them getting carried away. Not having fought a European enemy (i.e. technologically competitive culture) for decades, there was no need to do otherwise. It worked.
The tactics and outcomes of early Boer War battles support that. The Boer, living in a rural environment with long range hunting shots common and practical, and armed with smokeless powder Mausers which suited that tactic, could engage the British effectively in the often open terrain long before the british could respond, even if they were ordered to. However, the British adapted to the guerilla style of battle, fixed their rifle problems, and yes, introduced the concept of the concentration camp and came to a short term military victory.
As to who won, I suppose you have to go back to the original goals of the belligerents at the onset of the conflict. The British never got their red route from Cairo to Cape Town, but the Boers did not get their immediate independence guaranteed either. That debate goes on today.
IMHO.