Replicating Underwod 180gn. Bonded Ammo?

[Star Child]

The Underwood ammo with a velocity at 1,217fps. is still a very potent round.  The bullet may even perform better at this velocity than at 1,300fps.?

[Graybeard]

I doubt most 2 and many 4 legged creatures would notice 83fps difference.

[Star Child]

Here is a video on some test of Underwood ammo.  Notice that his chronograph reading of the Underwood 10mm 180gr. bonded bullet average was 1,204 fps. (at point 1:40 in video)  Which was close to my reading of 1,217 fps.

https://www.youtube.com/watch?v=KN4thm4J6ks

[Graybeard]

That's actually a little disappointing. Obviously with different guns and chronographs you would expect slightly different results. Your results and the video certainly make me believe the Underwood 180s aren't really up to speed. It might be close out of a longslide 1911, maybe.

Especially disappointing since I've run 180gr HPs, in a 5" 1911, at 1296fps with Power Pistol, and over 1300fps with LongShot and 800x. None of those showed signs of being over pressure other than very slightly flattened primers. For those that don't handload and expect that performance from Underwood, apparently they're not getting it.

Still a potent round, as you mentioned, but not the upper edge that Underwood built their reputation on.

[sqlbullet]

The 200 grain 10mm also expanded less than spectacularly.  I wonder how much less it would have penetrated if it had expanded properly.

Other than a little disappointment at the velocities nothing of note here.  Higher SD bullets at similar velocities as their lower SD counterparts will penetrate further.

[AlinMi]

Who's bonded bullet they using?

[Star Child]

Who's bonded bullet they using?

Speer Gold Dot 180gr. bullet.  My duty ammo is Speer 40S&W with this 180gr. bullet. So far we have had excellent results with this ammo.