I shot quite a few rounds of 458 win in my CZ 550 458lott. I did not shoot off a bench or a rest and as a result I dont recall any difference in accuracy. I guess, it comes down to practical vs technical. I used the win mag because it turns up on the 2nd hand / trade-in table. I buy it right and blow it off for fun: paper or what ever I wanted to bust up. Seems like it would kill stuff fine.

What I did notice was a significant shift in point of impact. I dont remember the amount. I got around it somehow. I just dont remember what I did. I have used a scope, a peep and plain irons on that gun. It is all a blur right now. In my opinion, I see no practical down side to shooting win mag. On the other hand, if it were not for the occasional score of cheap ammo, I see no reason to do it.

It is too bad no one offers a lighter bullet loaded in the win mag. Not necessarily a light load but maybe 400 grain soft nose for the NA hunter. Something other than 500 grain african game loads.