Originally Posted By: john_pifer
Did some "ballistics testing" on the 10mm 180-gr. Gold Dot Hollow Point (1300 FPS advertised) offering from Underwood Ammunition today.
Underwood ammo, double tap, and buffalo bore are famous for pushing a cartridge to its limits. What they have really done is push a bullet past it design limitations to the failure point. Many of your bullets appear to have failed, although water is very aggressive and they might have done better through flesh or ballistic gel. That Speer gold dot bullet is a 180 grain .40 caliber bullet that was designed by Speer to go about 1000 fps out of a .40. It has clearly been pushed past its design limits.
Speer spends years designing and developing a load and their science is spot on. I tend to stick with Speer, Federal, and Winchester factory loads that the three nuclear options above. Although with 10mm, it is really an overlooked, under developed caliber by the big three and their arn't too many good factory loads.