Quote History Originally Posted By DOG556:
Those Winchester silver tips did not show their advertised velocities. A few YouTube’s on those.
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More than that …
First, Winchester’s 10mm 175grn STHP projectile itself is old bullet tech from the 1980s. At best, it’s a great (and rapid) expander but a poor penetrator on anything but maybe thin skin and t-shirts. Forget if intermediate barriers are present between you and the “target.”
Second, Winny “box-flap” velocity for this ammo - alleged to be “1295 fps” - was always bullshit after about 1993. Back in the day, the early lots (the so-called “white box” ammo) were actually pretty close to that velocity from a 5” Delta Elite or 5” S&W 1006. But Winny used a 5.5” factory test-barrel fixture to measure and derive velocity/energy figures.
After the .40S&W was introduced in 1990 and gained popularity during that decade, most 10mm factory ammo was watered-down to .40-levels. Winny’s STHPs were no exception. In the mid-2000s, some lots of the 175grn STs we chronographed were doing a piddling 1125fps from real-world 5” pistol barrels and less from a 4.6” Glock 20. This was the “silver box” ammo.
Compare that to Norma’s original hard-edged 170grn 10mm JHP ammo. That chronographed at over 1300fps out of 5” Bren Ten barrels. Talk about a “Sonny Crocket load.”
Today, for carry ammo, there’s no need for the dedicated 10mm user to default to outdated bullet tech launching at diluted .40 velocities.
Just in loaded factory ammo we have much better bullet choices and you can find them loaded to
real 10mm velocities.