Your not getting talked out of it ha ha.
Great round, I put one together for my dad on an older M77 MKII that used to be a 300 wm. Using Retumbo in ADG 7mm rem mag brass necked down and a 26" barrel, we're shooting the 156 EOL at 3085 at a modest load, pressure signs don't show up until around 3180 fps, but the best consistency and accuracy was at the lower node. It's great, because 7mm rem mag brass is easy to find and has some good options available, and if you want head stamped brass, Norma isn't a bad option. It's the daddy of the 7 mag, it's old school, and it has killer ballistics. It is also about as overbore as you can get before the 6.5 bore starts getting finicky. 26 noslers and 6.5-300 wby types are great for what they are, but in general, can be a little more challenging to get them shooting great, and for the extra powder, don't really get you a ton. The load we ran before this one was a 147 ELD-M at 3240 fps, it was pretty close to the max in this gun but it shot great and really consistent. A 26 nosler will top that, but not by much, and with about 10-15+ grains more powder.
So, build one!!!