Does less barrel length = less accuracy due to the shooter, or the barrel? (pistol length)

[SkiPatrolDude]

Mechanical accuracy (if shooting in a vacuum) & practical accuracy are very different things.

 

[RoadDawg]

I think he's referring to peak pressure, which happens very early on in internal ballistics. Velocity is a result of a pressure differential accelerating the projectile for a longer duration. Peak pressure isn't higher in a longer barrel.

That unburned powder you mention is one of the reasons I mentioned that longer barrels can have more consistent powder burn(and therfore velocity) in comparison to a shorter barrel.

I know but I never said anything about pressure in the chamber. I specifically referred to barrel pressure. Sustained pressure equates to better ballistic performance. That happens in longer barrels.

 

[smokey]

I know but I never said anything about pressure in the chamber. I specifically referred to barrel pressure. Sustained pressure equates to better ballistic performance. That happens in longer barrels.

You said, "Longer barrel makes higher pressures. That effects bullet speed and travel." You didn't say "sustained pressure". Longer barrels do not produce higher pressures. The bullet is accelerated for a longer duration.

So now that you say "sustained pressure", you're correct. When you said "higher pressure" you were incorrect.

 

[Mark75H]

Facts don't matter in an emotional arguement

 

[Doco Overboard]

Finally at least, heat and friction are brought into the equation.

 

[teratos]

You said, "Longer barrel makes higher pressures. That effects bullet speed and travel." You didn't say "sustained pressure". Longer barrels do not produce higher pressures. The bullet is accelerated for a longer duration.

So now that you say "sustained pressure", you're correct. When you said "higher pressure" you were incorrect.
View attachment 366383

I’d hate to see what happens when Smokey gets out the red pen and starts correcting.

 

[RoadDawg]

You said, "Longer barrel makes higher pressures. That effects bullet speed and travel." You didn't say "sustained pressure". Longer barrels do not produce higher pressures. The bullet is accelerated for a longer duration.

So now that you say "sustained pressure", you're correct. When you said "higher pressure" you were incorrect.
View attachment 366383

FFS…

Did you check the punctuation and grammar too? The point was and still is that the pressure stays at a higher point for a longer period of time in the longer barrel.

What do you win?

 

[smokey]

FFS…

Did you check the punctuation and grammar too? The point was and still is that the pressure stays at a higher point for a longer period of time in the longer barrel.

What do you win?

It doesn't stay at a higher point. It does act on the projectile for a longer duration. The barrel length just determines at which point in the pressure curve does further acceleration stop. It doesn't increase or decrease the pressure curve itself.

I win nothing. You're on a gun chat forum in a thread on the effect of barrel length on ballistics. You presented an argument, I presented an argument. We're chatting on a chat forum in order to explore and better understand a topic.

 

[RoadDawg]

It doesn't stay at a higher point. It does act on the projectile for a longer duration. The barrel length just determines at which point in the pressure curve does further acceleration stop. It doesn't increase or decrease the pressure curve itself.

I win nothing. You're on a gun chat forum in a thread on the effect of barrel length on ballistics. You presented an argument, I presented an argument. We're chatting on a chat forum in order to explore and better understand a topic.

As you point out. It’s a chat forum. My point was not an entry into a technical data manual. And it was not intended to be an argument. (There are technical manuals full of that stuff if someone needs to read them.) Simply a general comment that… there is in fact a difference in how barrel lengths effect accuracy. You know… speed, distance, trajectory, and all that jazz.

But I guess the minutia must be argued.

 

[Mark75H]

No, facts need to be clarified. What you presented as fact was in error. Forgive me for speaking truth.

 

[Baccusboy]

I seem to think that website called ballistics by the inch took a look at some of these things you’re speaking of. I don’t remember it talking about accuracy. But I might’ve missed some thing as it was a long time ago that I looked. That website just came to mind. It was a great one. They sawed the barrel off a centimeter or an inch at a time and shot more bullets and took readings.

 

[RoadDawg]

No, facts need to be clarified. What you presented as fact was in error. Forgive me for speaking truth.

Fact: The word fact was not used in my post.

Fact: “IANABE” was used in my post.
(I Am Not A Ballistics Expert)
That was placed there preemptively, as I knew that someone would want to argue about some part of what I wrote.
And apparently the word “higher” should have been “sustained”.
Someone call the fire department and put out this dumpster fire.

But thanks.

 

[Crosseye Dominant]

I don't get it. Did someone make a (false) logical assumption that greater speed out of the barrel equals greater accuracy (the original question)?

Even if it did, the bullet is still in the barrel longer and more subject to movement after ignition... Which in a handgun could negatively impact accuracy.

 

[Michigander08]

I’d hate to see what happens when Smokey gets out the red pen and starts correcting.

Well, you would have to spend 2 more years in medical school.

 

[teratos]

Well, you would have to spend 2 more years in medical school.

I’ll take the zero.

 

[Michigander08]

I think peak pressure is hard to understand. It is the same like this one.

Why is torque falling despite higher RPM? Same physics answer.

 

[RoadDawg]

I think peak pressure is hard to understand. It is the same like this one.

Why is torque falling despite higher RPM? Same physics answer.

It has been said that the way to define horsepower Vs. Torque is...

HP is how hard you hit the rock wall.
Tq is how deep you go into the rock wall.

The point in the RPM where most engines produce the same numbers in tq and hp... (where the lines cross on the graph) is around 5225 rpm.

That aside...
With respect to the topic of barrel length...


https://gunmagwarehouse.com/blog/does-barrel-length-affect-bullet-performance/
states...

Now, in case you didn’t know, the reason a longer barrel provides greater performance is that the longer the bullet stays in the barrel, the more pressure builds up behind it. So, while the Barkeep Boot only has 1.68 inches to build up that pressure, the 16-inch Rough Rider has almost ten times that much. Of course, it doesn’t translate to ten times the performance but, as Dustin notes, it’s still “a substantial difference in both velocity and energy.”

 

[babalou]

So…
The 1.75 inch barrel of a snub nose .38, is going to allow the same pressures to build up behind the bullet before it leaves the barrel, as a 10 inch barrel of a semi auto SBR?

Tell us all how the unburned powder which can be seen in slow motion photography as it leaves that short barrel behind the bullet, is ever utilized like the powder which actually gets burned when the same bullet stays in the longer barrel for more time.

Unburned powder = wasted powder = less pressure.
Complete burn = more force = higher sustained pressure.

ianakia

1.75"? i still had children

 

[RoadDawg]

1.75"? i still had children

But... did your pressures increase or decrease after the shot?

 

[babalou]

But... did your pressures increase or decrease after the shot?

still high pressure hahahahaha. You knew I had to go there brother. hahahaha