I have a 416 Rem Win 70, a late New Haven gun. Hard to imagine having to hold the rifle in a certain way to load. I'm trying to visualize some condition that would cause this but without rifle in hand?? Mine... just hold in whatever position and with the thumb, press cartridges straight down into magazine. Don't even have to look to see how to do it. The cartridges sort themselves as they stack. The only thing I can think of is the length limitation of the Mod 70. Anything longer than 3.60" is too long. A 400 gr Swift A Frame loaded with the mouth crimped into the crimp groove on a standard length 416 Rem Mag case will yield a cartridge length of about 3.580. Any longer and it starts getting iffy on loading.
