Bought my 452 about a month ago and my pal bought his 455 yesterday. Both Varmints .22lr. Was surprised at the differences. One seems as accurate as the other with different ammo. CCI Mini Mags being the best of the HV so far. Both Heavy Barrels of course but his 455 barrel is definitely thicker/heavier than my 452s. His stock is nicer and different too. Both same price. Some shooters claim the 452 is more accurate but I doubt it just going by our informal testing today. Tomorrow will be a gopher day, so more testing involved.