You have a lot of abouts & roughlies in there. Are you chronographing the loads, have you weighed the guns? A few oz of wt matters as does a few fps vel. The 357mag uses quite a bit more pwoder to achieve the vel & that adds to the bullet or ejecta wt, but the blast is more likely causing the felt recoil to go up. Burning all that extra powder adds blast & that adds felt recoil. Also my 357mag loads are doing quite a bit more than 1175fps in a 2 1/4" bbl SP101, my shortest 357mag.

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NRA Cert. Inst. IDPA CSO