Yes I agree, the point I was making was that the velocity can be calculated reasonably accurately using a ballistics program if you dont have access to a chrono on the range. I was clear that the point of impact here is the important point, not MV. In my case as long as ME meets the minimum in law for the quarry then I dont care as long as I have a group zero (for want of a better phrase) for different bullet wts. Ron is trying to duplicate the factory round, something which I have done with my MAS 36 by loading in steps up to the max with the correct bullet wt and then achieving correct POI for the sight settings! Your point demonstrates what I said earlier about changing things on the rifle such as bipod, moderator etc which moves the POI. The BOSS system is ideal for finding sweet spots with factory and hand loaded ammo that will save you time experimenting with different powder wts etc with handloads. What I am trying to achieve is different to Ron, I need an acceptable poi for one rifle at different ranges with 2 different bullet wts. ron needs to tune his hand load so that he has the ammo available with one zero setting. I have done this for my mate and his 22-250. We are now at the point of ready to test the 2 preferred loads at 50, 100 & 150 for group and POI aganst his factory and prove which load we developed will replicate his factory. here factory sporting ammo is expensive and you cant guarantee batches so loading an identically performing round is a great help. He doesnt reload so I do it at my place in his presence so he knows he has the confidence to shoot that round!stubblejumper said:The point of impact at 100 yards is not a good way to judge velocity.Loads with higher velocity can actually print lower at 100 yards.I proved this to a fellow one time by adjusting the boss on a browning A-bolt that I owned.The velocity stayed constant as adjustments were made,but the point of impact moved vertically as well as horizontally.The changing harmonics of the barrel do change the point of impact.