I even used them in my 6.5 jap with good results .That was my kids rifle before I got the 260 Remington.I have only used necked down 308 brass in my 260 so far .I like the 26 win mag but it kicks way to hard for kids .I like the 260 way better than the 243 Winchester also .These 155 grain lapua bullets should make it hit way harder than The 140 grain bullets .