There are only so many people that can shoot 375 H H performance rifles. The cost of a rifle, especially in the magnum chamberings are expensive. The cost of ammo, new dies in a new caliber, etc. are expensive. All the extra cost for a 1/2 inch reduction in bolt throw, I really don't think so. So many new chamberings have been added. The 7mm STW, the great long range cartridge is going down. The Remington calibers are going the way of the 35 Whelen. The Winchester calibers haven't dented the sale of the 7 mag, the 06 or the 270. To be a successful cartridge, there has to be some worthwhile reason to invest over 1,000 dollars, plus pay higher cost for ammunition. Shortening a bolt throw 1/2 in isn't enough.
C F