I would have to agree with the man that approached you, in the 3 boards I go to, there are very few people shooting this round. There is also a great lack of factory ammo, and the best bullets ever used in this caliber (Nosler Partitions) have been dropped by Remington in favor of their Core Lokt Ultras.

Realistically, there is no need for this caliber. 7mmSTW, as said before, has almost the same velocity, plus it has a much better foothold than the RUM when it comes to buying factory ammo. My friend has a model 700 in this caliber, and it's a nice rifle, but if I had much rather have the STW. Just my .02

Hope this helps,
timba