M*CARBO Brotherhood

Velocities From 18.5" 9mm Barrel?

Hi,

Has anyone choreographed their 18.5", 9mm Sub? There is a lot of info on 16" barrels, and I’ve read other tests on 18" and shorter, from other brands. There is however, very little on the web that is specific to the 18.5" barrel, Sub 2000 velocities.

Thanks!

2 Likes

@Yuk, Do you have an aftermarket barrel on your Sub 2000? The barrel length is 16.25" on a stock Sub2000. This is from the Kel-Tec Web search.

The semi-automatic Sub-2000™ is designed to be the most convenient 9mm or .40 caliber rifle available. It’s adjustable and foldable to …

Folded: 16.25”

Barrel Length: 16.25”

Length Collapsed: 29.25”

Overall Length: 30.5”

1 Like

Most export, Sub 2000 barrels, particularly to commonwealth countries, have 18.5" barrels. Shorter barrels are illegal in Canada.

2 Likes

Oh, ok. I didn’t know that our northern neighbors had those restrictions.
My Sierra reloading manual shows the same load for a 4" pistol barrel and a 16-1/4" PCC barrel. The velocity out of the pistol is 1000 fps and out of the PCC is 1350 fps. Taking into consideration that the PCC barrel is 12.25" longer simple math would say that each extra inch of barrel increases velocity about 28.57 fps. Assuming all else is the same that would put the same load out of an 18.5" barrel at 1414 fps. These are just a simple guess though. It is going to be very dependent on if the pressure curve in the barrel is still accelerating the bullet or if in fact the bullet is deccelerating because the pressure is dropping off rapidly due to all powder being burnt before the bullet exits the barrel. I purposely load slower burning powder when reloading for my Sub to get a more even pressure curve.
Bottom line is I can’t answer you question without a chronograph and an 18.5" barrel, I can only make a guess.

3 Likes

@Yuk, Maybe this will help.
http://www.ballisticsbytheinch.com/9luger.html
Looking at this chart, it does look like most loads from an 18" barrel are slightly slower than 17" barrels, and about the same, maybe slightly better than 16".

3 Likes

Thanks for you replies Texprep, I appreciate them!
As you have found the information I’m looking for is very hard to come by. It is very clear that velocity tends to drop in a Sub barrel once the length begins to exceed 16", and that drop is not necessarily linear. Just because one brand of 18" barrel produces a certain velocity range, doesn’t mean the 18.5" Kel Tec barrel will be anywhere close to the same. I don’t have chrono to figure it out myself, but hopefully there’s an international owner who’s already gone through the process.
Cheers

4 Likes

I’m also up in Canada with the 18.5 inch barrel.
American Eagle 147 FMJ advertises itself as 1000 FPS muzzle velocity.
I’m getting 1160 - 1193 on my Caldwell chrony.

4 Likes

That’s very cool to know, but since I made my post in March, Trudeau and Blair were re-elected, so I unloaded the Sub. These are dark days in Canada. Gun owners are now being persecuted.

5 Likes

Very dark days ahead. At least here in Alberta, the provincial government is trying to block the Federal Gun grab.

8 Likes

This is one of those situations that make us in the U.S. appreciate that we have a 2nd amendment. And reminds us of how important it is to protect it. Our gun rights should never be dependent on the personal whims of politicians, particularly the ones who are trying to make themselves look like heroes.
Ban semi-autos for hunting - WTF - I hadn’t heard about all the mass shootings of critters in the Canadian woods.

4 Likes

Every freedom loving person must now fight to keep the 2A! Last week the Supreme Court heard oral argument in a challenge to the constitutionality of a New York City rule that barred gun owners from taking their licensed guns outside the city. The gun ban lobby was out in force on the steps, while only a handful of people from the pro-2A movement showed up. It was so bad, the media barely had anyone from the pro side to talk to!!! The U.S. is only one step behind Canada. If you guys don’t start really showing up, on all fronts, in about 5 years you are going to be in the exact same state we are in Canada!

3 Likes

The last mass shooting in Canada was 40 years ago at the poly technique (sorry for the spelling). The problem we face now is gun crime. we have lots of laws on the books, But the judges refuse to hand out max sentences to gang bangers. Most Police departments are publicly stating that they are againest this legistration

3 Likes

Rob2, You are almost entirely correct, but by many people’s standards, a mass shooting involves three or more people. By that standard, there have been many more since the École Polytechnique massacre. Especially involving the RCMP.
For example:

1 Like

That is a valid point, however the “poly” shooting is the one most reported on. As of last week you have survivors of that shooting stating that “Gun control in Canada has failed”. I for one do not choose to include the above incidents because they were cases of the RCMP engaging criminals. Civilians in Canada are extremely safe in our country. The left is calling for Gun Bans, instead of forcing Judges to enforce the rule of the law. Crimanels are not going to surrender their illegal firearms, So what is the point of disarming law abiding citizins. We have plenty of tough laws on the books but Left leaning judges refuse to hand out max sentences which would serve notice to the law breakers that this “Will not be tolerated in our society”

2 Likes

Again, you are correct. I simply like to remind those on our side that there are other arguments that the anti-gun crowd like to use. These other arguments can often trip us up if we aren’t careful. Another example, that the fact twisting Antis use, is the Dawson College attack. Only two people were killed, but it would be disingenuous of us not to recognize that event.

1 Like