Just an up date on this.

Been out today and fired one Hornady superformance factory 58g v-max, and one 48gn home loaded hornady 58g v-max.
The reasoning here was to test my "ants" 300mmx11mm weaver rail drill for the Tikka action myself, im pleased to say its only 4 numbers out of centre on height, and 7 numbers to the right (Drone Pro 10x ), the 48gn home load was well under maximum load, and its was quite near the hole made by the factory load -------so with some tweaking its looking good.

With my home drilled weaver rail now being ok, ive loctited it on the rifle.
Next outing will be zeroing and load development.

Thanks to all your help on this thread Dave (warbucks)