Handirifle: The 350Rem Mag only comes in 200gr bullet weight. You can not load anything heavier for the Remington rifles, length is the problem. I also own a Ruger M-77 in 350Rem Mag, I can load 225gr Nosler bullets with it but that is the limit. I then have to load these rounds singly, they will fit in the chamber but not the magazine, they are too long. With my .35 Whelen I can load 250s. But the main reason NEF/H&R will not be making barrels for the 350Rem Mag is the fact that it is a belted magnum case. The ejectors will not let the case seat properly without hanging up on their way in on the belt. The 350 was designed for the little Remington 600, quite little gun. Vented rib, laminated stock, butterknife bolt handle, and it kicks like a mule. I've got one but it is strictly as a collector's view that I own it. I made a nice wooden case with glass front and hung it on the wall. I'll never shoot it again. My Ruger is used every year by someone. Right now it is stashed in a sealed 55gal drum along with a tent, sleeping bag, clothes, and misc camp gear, down in the Alaska range. I took this stuff in last winter on snow machine, during hunting season the area is a walk in only area. This way I don't have to carry a heavy rifle, just food and ammo.