The "impulse wave" from the rifle is a much higher frequency and much faster pressure curve than the slugs. Makes FELT recoil sting you more. Basically imagine it like this, I PUSH your shoulder with 25 pounds of force verses I snap a punch with equal power into your shoulder. Which do you think you will PERCEIVE hit harder? I am pretty sure there is a calculation in those things for the impulse wave but my Physics is rusty to say the least.
My recoil calculator has two figures, Recoil Velocity and Recoil Energy. A 30-06 loaded with a 180 Partition has more total Recoil Energy than one loaded with a 150 TTSX but the faster load has comparatively more Recoil Velocity so the felt recoil has more snap to it.
That 7 3/4 lb rifle loaded with the 130 TTSX to just over 3000 fps recoils under 14 lb. The 125 Ballistic Tip at 2800 is even less.
Don't have the lightweight 260 yet so I make do by loading the 30s down. It works fine so I don't really need the 260. Just gotta have one.
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