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So, I made up some loads, and my 7mmRm browning hells canyone was driving almost all of them from 65g of 2217 to 69g 150g eldx within 3/4moa at 100m, 2 groups are around 1/2 moa, with the lower 65.5g load.
The 300wM had 2x promising groups of rl26 throwing 178g eldx under 1/2 - 3/4moa at 100m in the tikka. 89.9g
If these were bang on at 100m windage wise, would they differ much at 200m?
some pretty good results, you must be happy with that. if the reticle and bore were both aligned when you were shooting, then the windage shouldnt vary noticeably at 200m. at longer ranges other things start to apply such as spin drift, coriolis etc (im sure others here can guide you more on those aspects than me)
i would hazard a guess that at 200 one needs only to worry about wind,,canterbury has ferocious gusts and one time we were shooting tahr and the drift was 14 inchs
Two great shooting combos by the sounds, congrats