I have never let having factory rounds slow me down. I just go buy a few 100 cases. I even had 240 cases for my 30-338 Weatherby. @ about $3.00 per each unprimed case. Be realistic. What event would you go through 300 rounds or 500 rounds and have to worry about finding a store for more. I've said the same thing to friends. Don't WORRY!
I have cut down cases and fire formed wildcats. Some of my guns don't even say what they are stamped on the barrel. Good luck on stealing one of them and trying to figure out what might fit in them.
I reload, chronograph, ballistic tables, keep notes. So I would not want to buy some factory load for my OEM rifles anyway. Because you would have to start all the new load data over and chrono the factory round to figure out where it's going
Anyway enough said.
I'm a 7STW person. But the 284 Jarret might be a fine rifle.
The 284 jarrett is a 300 win mag necked down and blown out with a sharper shoulder, these are the case volumes and velocities they have posted on their site.
(Volume to base of neck)
7mm Remington Magnum 73.5 gr.
7mm Weatherby Magnum 78.0 gr.
284 Jarrett 85.5 gr.
7 STW 98.3 gr.
It's interesting to note where we are volume-wise, 12 grains greater than the Remington Magnum and 13 grains less than 7 STW.
140 gr. bullet -- 3450 to 3500 fps
150 gr. bullet -- 3350 to 3375 fps
160 gr. bullet -- 3250 to 3300 fps
Any other opinions on jarrett barrels???