When my buddy and I worked with one of the first Remington 700s that came out in 260 which had a 24" barrel we made cases our of Rem. 243 and used H4350 with both 120 and 140 Sierra SP bullets. It was not picky about the powder charge and accuracy so we just loaded it until pressure signs started showing up and then backed off a little. There was no load data out yet for the 260 Rem so we just used a starting load from the 6.5x55 Swede and worked up. Using both bullets while doing crop damage control in east NC we took 50 deer from on top of us to a little over 500 yards and only had one move out of it's tracks and it only took three jumps. That one was heart shot with a 140 gr at around 200 yards. My buddy does not keep a rifle long. Another of his friends offered him a BUNCH of money for it so he sold it.