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Wow IDBob, why don't you just say the 260 is about the same as a 30-30?
They are two different animals, but not that much.
The 260 Rem doesn't need the "magnum" moniker to do its job well.
Mine must be exceptional, it shoots 85gr.Sierras @3160 fps and will send 120gr.Sierras @2940 fps.
I've never run a 264WM, can't comment on it.
Clayman
Nothing wrong with either cartridge and yes the 260 does well withing it's design perimeters, but here's some comparisons from Speers #13 manual.
The top load with a 140 grain Grand Slam bullet in the 260 Remington with Re 19 is 45.5 grains for 2731 fps.
The top load with a 140 grain Grand Slam in the 264 with 73 grains of H 870 is 3130 fps. Thats almost 400 fps difference.
The top posted load with 120 grain Speer bullets for the 260 is with 48 grains of Re 19 for 2950 fps.
The top posted load with the 264 with 120 grain Speer bullets is with 76 grains of H870 for 3300 fps. This is 350 fps difference and a whale of a difference at long range.
I've checked several other manuals and would suggest that your loading pretty hot for the 260, but lots of us do that. I wouldn't suggest folks load that hot, but I've got a couple of guns with chambers that don't show pressure signs with loads over posted loads.
All in all most manuals show 300 to 400 fps difference between the 260 Remington and the 264 Win mag. That's a lot of difference and a bunch of difference in performance downrange.
I really think they are that much different, no offense meant, but a 30-30 comparison certainly isn't appropriate, but I'll stick to the 308 to the 300 Weatherby comparison.