Hi Model 70,
Weeeeeeeell you could talk ballistics all day to that boy but you won't change his mind and not a lot will until some thing bad happens whilst Deer hunting and he loses one.
I pray that this will not happen and he will grow into other rifels/cartridges as his interest in shooting grows. All he needs to know about ballitics now is that when he aligns those sights correctly the Deer is his
it does not matter how fast his bullet is going or what the BC is. It works and that's all he cares about right now, not a bad state of mind to be in I might say. The technical bods amongst us often confuse ourselves with too much data and then make a muck up of it
the less to think about the less to go wrong at that point.
If you look at my chrono figures I have loaded the 7x57 so it's not far behind the 270 Win, the data for the 270 was with 130 grn bullets and the 7mm used 139 grn bullets. Less than 200 fps between them and I can load the 7mm some more for a higher velocity yet and close te gap some more. I wonder what the difference would be if I loaded them to equal pressures. The rifle is the same make and model so the strength is not an issue, brass is brass and 7mm cases are a good design after all the 30-06 is based on the 7mm