Shot my carry load through a chronograph at seven yards

[Road_walker]

I didn't want the number off a spec sheet. I wanted to know what my actual load was doing out of my actual barrel at an actual defensive distance. Those are very different things and it turns out the gap between them matters.

What I got back from the chrono was not what the manufacturer had printed on the box. My short barrel was losing enough velocity that it changed how confident I felt about expansion at that speed when I stacked it up against the ballistic data. It is not a small thing when you're talking about a round you're counting on.

Do this. Go find out your actual numbers. The spec sheet is telling you what happened in their barrel, not yours.

 

[Hardshell]

Good reminder. It’s easy to assume published data is gospel but your own gun and conditions are what actually matter when it counts.

 

[IN10SS]

What were you shooting and how far off were your numbers from the provided data? Although your data does not directly apply to anyone else the example certainly illustrates your comments better than words alone. Ha ha, shooting nerds like this stuff. It’s like bench racing with car guys. Thanks.

 

[Nugg]

Real-world barrel length and velocity can differ a lot from factory specs and that gap can absolutely matter for terminal performance.

 

[Jozzy]

I had a similar moment when I finally chrono’d a defensive load out of a shorter barrel and realized I was a lot further off published velocity than I expected. On paper it looked great but in reality the numbers dropped enough that it changed how I viewed the margin for reliable expansion. After that I started testing everything through my actual setup instead of trusting box data, it was a good reality check.