As Unclenick stated, the difference can be quite noticeable between powders that are close to each other in burn rate. I can easily tell the difference between Titegroup and Clays in 9mm and 45acp. I think that it has a lot to do with noise, maybe more than what is felt. Clays makes a pop noise compared to TG in 9 and 45, and H-110 roars compared to TG in 357mag. That extra noise makes us percieve the recoil as being greater, so we "feel" it more.
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