[elb]

For those of you interested in such things, below are some measurements for various types of 9mm ammunition that I fired through my FN Herstal SFS-HP and my Kahr P-9.

According to the specs in their respective owner's manuals:
- the Hi Power has a 4.6" barrel, of which 4" are rifled. (It appears the 0.6" portion is the chamber)
- the P-9 is spec'd with a 3.5" barrel, with polygonal rifling, but the book doesn't say if this is the rifled length or rifling plus chamber. Pulling out the tape measure and the assembled pistol, it appears the latter is the case, and the actual rifled barrel is about 3" long. (I am too lazy to field strip it and pull out the calipers right now.)

The AV Diff (Average Velocity Difference) and SD Diff (Standard Deviation Difference) are the P-9 numbers subtracted from the Hi Power numbers, i.e. the CCI Blazer line should be read "the Hi Power average velocity was 84 fps greater, and its standard deviation 7 fps greater, than the P-9."

Generally I measured 10 shot strings. Occasionally I tossed a measurement if I was convinced there was a measurement error. For instance, I clocked one round at well over 2000 fps

. Don't think so. The chronograph can be fooled by stray shadows sometimes.

The chrono is a Competition Plus by Competition Electronics. Bought it about 10 years ago for about $80 to $100, don't remember exactly. Stood it 10 feet from the muzzled and let 'er rip. Carefully.


<table border="1"><tr><td>[size=100:to2hdg24]<pre>
Ammo Pistol AV SD AV Diff SD Diff
CCI Blazer 115gr FMJ P-9 1091 6

 

[Stephen A. Camp]

Hello. Thanks for posting your information. This will be useful to many folks here.

Best.

 

[elb]

You're welcome! The hardest part is formatting the table when posting it in the forum. That's no fun. But shooting and measuring is fun, and more to come.

elb

 

[pff]

Hiya ELB,

How did you do the table? I tried and none of the columns lined up. I wound up just putting in the average speeds because it got _real_ confusing adding all the columns.


TIA,

Pat

 

[elb]

Pat,

This was a real pain to figure out -- there might be a better way (there OUGHT to be a better way!), but here's how I did it. Not sure how familiar you are with the editing buttons, so I put in some simple-minded descriptions that match my intellect - plz don't be insulted!

1. Do your table in Excel or Word or whatever floats your boat. Select and copy the whole table to the clipboard.

2. Go into the "new thread" or "post message" function of this forum, where you can see all the editing icons at the top.

3. Select the "Insert Table" button from the editing icons (it's the first one that looks somewhat like a tic-tac-toe game). This puts some code that looks like this " .table..tr..td../td../tr../table. ", except it has square brackets where I'm showing dots to keep the system from trying to build a table instead of showing example code.

4. Insert your cursor between the ".td." and the "./td.", and then select the "Pre-formatted Text" icon (it is the first one with horizontal lines). This will put some more code in the middle that looks like this ".pre../pre."

5. Now, put your cursor between the ".pre." and the "./pre.", and paste in that table you copied earlier.

6. Hit the Preview button to see how it came out. I have found that if the text in any one column is too long, it shoves everything over too far, so sometimes i have to abbreviate, e.g. "Blzr" for "Blazer". Tinker a bit with it, hitting preview to see the changes.

7. Finally, add in your comments. (I find it easier to see the table changes if I don't have all my other comments cluttering up the post).

Couple heads-up:
- Copy your whole post out of the editing (Message window before you hit preview in case the forum or your connection to the internet hiccups - then you don't lose all the changes you've made to that point. Learned hard way. :'(

- Make sure you are connected online before hitting preview, or you lose everything when you hit preview or post. I have tin-can modem with a string running out to the nearest phone pole, and drop connection all the time. Learned this hardway several times. :'( :'(

- If you are so inclined, having an adult beverage handy sometimes helps. It doesn't add to my analytical skills, but it makes the process easier to put up with.

Tedious to do, much more fun to do the shooting. Maybe someone else here has figured out a mo'betta' way. Josh?

elb

 

[pff]

Thanks! I'll give a shot maybe tomorrow.

I ran a buncha tests a couple years ago with a varied collection of 9mm's and .38's, plus a few in .40. Was working on the .380 data when the little Colt Pocket Pistol ate a skyscreen.


Thanks again,

Pat

 

[erich]

ELB, thank you for your kind effort in posting your results. Very interesting reading.