Little has changed with.17hmr it just costs more. A lot of the criticism is exaggerated on forums with unrealistic expectations. I think it's no different to anything else, some rifles shoot better than others as if true then all brands are made by one manufacturer. 20gr are more accurate than 17gr same as found with other .17 calibres. Split cases is result of size of barrel chamber. No split cases with cz457 the same round Will split In sako quad. Same accuracy regardless of split cases and some rifles are more accurate than others. Always been that way whatever IMHO.