The difference is that you're comparing a full-sized service gun to a compact CCW gun. If you want to compare a 9mm to a .357 Magnum snub, do so in comparable guns.
Please refer to my first post...
I made the comment that I placed the Hi Power right down on top of the model 66 - and guess what???
They were nearly the same exact size.
Nope - I''m making a 100% fair comparison there.
If two guns are the same size and weight, where's the difference?
A snub nose K frame is a pretty hefty piece.
The small grips tht S&W has can reduce the size a litte - but - not by a whole lot.
Also, I think there's a pretty substantial difference between a 147gr bullet from a Browning Hi Power and a 158gr bullet going 100-150fps faster from a .357 snub, much less if you chronograph the 147gr 9mm from a small gun.
Excuse me - but - did you bother to read what I posted?
Who (but you) said anything about a 147 gr and/or a 158 gr.
I said 124 gr and 125 gr...
Now - let's look at the 124 gr from a Hi Power - a 124 gr +p clocks at ~ 1100 fps.
A 125 gr from a Kframe - either model 19 or 66 - clocks at .....~ 1100 fps..
Those aren't my figures BTW - the late Steve Camp posted a wealth of information on both on his web site.
That's pretty bad news because a couple hundred fps is more than enough difference to be inside or outside a particular bullet's designed velocity window. In nearly every chronograph test I've ever seen or read, an extreme spread of 100fps or more is highly unusual
Then I strongly suggest you go to the site you're referring to - BBTI - and peruse the raw data.
A spread of 100 fps is very common.
Very first one - 115 gr Corbon - hi - 1445, low - 1274 - ES 171 that's from a S&W.
The Python w/a 6" barrel doesn't fare much better
`115 gr Cor Bon - hi -1356, low - 1193 - ES - 163.
Well - maybe that's just beacuse it's a 110 gr Cor Bon eh?
Let's move on down the list to something else....
How about a Federal 125 gr...
Hi - 1523, low, 1357 ES 163...
What's significant here is that two shots were in the 13's and two were in the 15's..
That's from the S&W
Python - hi - 1433, low - 1300 ES 133
You know what?
I'm really tired of this...feel free to look it up yourself...there's plenty more that are in the mid 100 fps range..
I already know what I know...
Is 200 extreme?
Of course it is - but - it's not unheard of.
Just look around at the data people publish.
It's rather sobering how inconsistant velocities are.