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Bill Leeper did mine.It was his opinion that Winchester screwed up in having such a short throat on pressure sensistive cartridge,so throated it "standard".I have no idea what that is,I leave things like that up to Bill.I am loading 140 SSTs .030" off the lands,it's also max for my FN box.This is second barrel,a Douglas,the orginal (unfired )FN was high friction,slow and a walker.It was also very short throated.
I am very hesitant to say how much powder because John Barness used 3 grains less in his bit worn Winchester Westerner,a new one would use even less.But with that caution,72.0 grains of Magnum for a bit under 3200f/s.I certainly couldn't use that much powder with the first barrel.And in load development this time there was no excitement.
I didn't get to use my 264 yet on deer ,when I checked my scope,it had come loose.It was a new Leupold VX-3 3.5x10x40.And on rifle that kicks less than my 30.06s.Maybe next year on those big clearcuts.
I picked the 140 SST ,my thinking was anything that long and skinny would hold the core,but I was worried about expansion.John used the plain Speer 140 with excellent results on a couple of deer.
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