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Bugger all difference in ballistics between any of them at 100yds though! And that wouldn't explain different horizontal POI either.

Certainly the ballistics will differ at longer ranges, I agree...

I expect shorter/stiffer barrels might have less variation in POI between different loads due to harmonics. Could be wrong though!

I only have one mag. If mainly shooting wobblies but with the odd deer or goat then I have the mag full of 53s and some 68s in a pocket to single feed if i want them. Depends how easy it is to single...

Mine puts 53vmax and 68bthp to the same POI at 100 (and similar groups around half inch, the 53s are a tad tighter). I don't know difficult the load development etc was though, my uncle brews up my...