First, you don't have to "over pack" the 7 RM to stomp a .280 AI, load them both to SAAMI Max with the same weight bullet from the same length barrel, and "voila," a clear winner. The 7 RM capacity is 80 grains, the .280 AI is only 65 grains... 15 grains is quite alot. Secondly, the answer is simple physics... it is not up to some factory loads you pulled off you local CT shelf... and it is not "down to the specific rifle." Anyone, including manufactures can down load one cartridge and upload another and claim a win, but AGAIN, with equal parameters the .280 AI cannot beat the 7 RM or even get within 100 fps... when loaded to SAAMI Max with same weight bullets and same barrel lengths... how else can cartridges be legitimately compared? Looks like the the .280 AI is your pet and you are defending it no matter what the science dictates... Kind of like Ballistic Wokeness...
good write up Hoyt ..ONE big problem
handloads vs factory that 75 % hunters use
so your above , means nothing to the avg Joe
pounding yur chest cause it feels good when you stop ..good greif