I would agree with Viking.....ammo is the biggest variable by a wide margin.
I don't own a 452 so can't make a direct comparison. I do, however, own a .22LR 455 Trainer with a 3-9x32mm scope zeroed at 50 yds. I've checked it at 100 yds off a front sandbag using Remington Thunderbolt 40 gr LRN with wind blowing left-to-right. Since many "experts" claim this is terrible ammo (it's on the Internet so it must be true, right?
), my limited results (only a few shots due to time constraints) would indicate that a 455 straight out of the box is pretty darn good - 2 MOA. The hits are low and right as one would expect for the range at which the scope is zeroed and the wind direction.
