ironeagle_84,
You found the 6.5SLR cartridge, I hope. The Weatherby is at the 'smith to be reamed with that reamer. He told me he would start on it today.
Also I have a new wildcat on the way. It is the one I will use the 123 Scenars in. As soon as I get a formed case I will drop one off for you. The body will be a .338 RUM to shoulder /neck junction with a 7 RUM case length giving it a longer than normal neck length.
Ben at Hornady named it 6.5Rumln. I asked him what that stands for. He said, "That is 6.5 Remington Ultra Magnum Long Neck." According to Nosler manual the .338 holds 103 grains of water. I am hoping for 3,850 feet per second with these bullets. I would like to find some solid copper bullets in that weight range with a high BC in case these can't handle the higher impact velocity. Maybe someone here knows of one.
