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I get where it came from. The hottest 10MM loads are in the neighborhood of some “normal” factory .41 loads but it never gets to hot .41. The 10mm and .357 are pretty similiar from factory to top loads. The 10MM to .41 comparison though does not seem fully honest
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At one point I did a thorough survey of all commercially available .357Mag, 10mm and .41Mag ammo.
The .357Mag and 10mm were very close in terms of momentum and energy while the .41Mag topped out WELL above either one in terms of both.
The comparison came about because of one particular loading. When the 10mm was still pretty new, there weren't a lot of different loadings for it. One of the loadings was the Winchester Silvertip. As it happened, there is also a Winchester Silvertip loading for the .41Mag, and when the two are compared the 10mm loading was actually a little hotter than the .41Mag. What wasn't immediately clear from that comparison was that the 10mm Winchester STHP loading was near the top end of the 10mm power scale and the Winchester STHP loading for the .41Mag was near the bottom end of the power scale for that caliber.
But the comparison stuck and people have been citing it ever since.
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