Im looking for some expertise advice
I have recently purchased a Tikka .243 Varmint with a Zeiss 3x12x50 Duralyt scope, Tactical Third eye mounts and over barrel Mod. I zeroed the rifle at 100yds with factory Federal 100 grains sp bullets which were aout 1inch groupings. I have also got a Hornady reloadig kit which i made some ammunition with Hodgdon H414 powderand Hornady 100 Grain SP heads. The max load is 40 grains of powder so it has asked me to download it by 10% - 36 grains which i have but they aint even hitting the board at all. The load was increased to 38 grains and it is a terrible group, maybe 4 inch or so .
The question is should i change to a 95 or 105 grain head and powder that suits them and give that a try?
Suggestions would be apreciated.