 FPS change with barrel length
#133563
06/26/2013 5:54 PM
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Joined: Jan 2013
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cougariii
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journeyman
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I am wondering how much the speed changes in going from a 10 inch say to 14 inch and even further if going to a rifle barrel. I am looking for pistol cartridges more than anything. I have a 41 mag 14 inch contender and thinking about getting a 24" rifle barrel for it also in the same caliber but trying to see it is worth while to do it. I am starting ot handload so it would be nice to only have to load one caliber.
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Re: FPS change with barrel length
[Re: cougariii]
#133564
06/26/2013 6:42 PM
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Joined: Oct 2012
Posts: 255
Scienceguy
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It varies by caliber, I believe that high pressure rounds such as a 357 are more sensitive to changes in barrel length than are low pressure rounds such as the 45 Colt. From a normal handgun barrel to a rifle barrel ~20 inches only picks up 150~200 fps in 45 Colt. It also could vary by the type of powder and weight of bullet how much of an effect a change in barrel length would have on velocity.
Google "ballistics by the inch" great read!
Please don't quote me because I could be bubbling bull excrement.
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Re: FPS change with barrel length
[Re: Scienceguy]
#133565
06/26/2013 6:54 PM
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cougariii
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No worries. I am just asking for an estimate anyway to plug into ballistics calculator. I am wanting a 150 yard rifle or pistol in the 41 mag caliber. I think it will be fine but as always ask the guys who do it all the time and get the straight facts first.
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Re: FPS change with barrel length
[Re: cougariii]
#133566
06/26/2013 7:02 PM
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s4s4u
Shootist
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Shootist
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have a 41 mag 14 inch contender and thinking about getting a 24" rifle barrel for it also in the same caliber Velocity will increase with the added barrel length, and smaller bores will benefit more than larger bores. The rate of increase per inch levels off as the barrel gets longer as well. IOW, there will be a greater increase during the 4" from 14" to 18" than from the 4" from 20" to 24". In theory you could have one load for both a pistol and a rifle, but it may be a chore to find a single load that shoots as accurately from each. I think Scienceguy is pretty close at that 150 to 200 fps, a 44 mag will gain about 300 fps from revolver to a carbine. I'd like to get a 45 Colt levergun to go with my revolver, but a 14" Contender is darn near a rifle already ;-)
Rod, too.
Short cuts often lead to long recoveries.
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Re: FPS change with barrel length
[Re: s4s4u]
#133581
06/27/2013 2:49 PM
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Joined: Oct 2012
Posts: 255
Scienceguy
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I think that a 41 mag would do just fine from a rifle out to 150 yds provided you do your part and know where it will hit at what yardage. I am guessing this is for deer or just paper?
This is a topic I am interested in so please keep us updated with your results. One day I will have a 45 colt carbine....
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Re: FPS change with barrel length
[Re: Scienceguy]
#133582
06/27/2013 3:25 PM
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Joined: Jan 2005
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wapitirod
Shootist
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Shootist
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As stated short barrels and long barrels will have different changes and the particular cartridge and powder will also have an effect. The general rule of thumb is 50fps per inch but as noted it varies but it will put you in the ball park.
I won't be wronged. I won't be insulted. I won't be laid a-hand on. I don't do these things to other people, and I require the same from them. John Wayne-The Shootist
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Re: FPS change with barrel length
[Re: wapitirod]
#133583
06/27/2013 4:00 PM
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Joined: Jan 2009
Posts: 1,037
wtroper
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I have no experience with a 41 mag rifle. However, I have several 41 mag revolvers. I would not expect 50 fps gain per inch moving from a 14" to a 24" bbl. My only experience with a rifle in a revolver cartridge is with a 454. I owned (for a short while) a browning single shot rifle in 454. I was quite disappointed in it and did not keep it very long. I do not recall ever shooting it over a chronograph.
If I were interested in a rifle in a revolver cartridge, it would be one with a "short" bbl --- carbine length. However, the old Winchester rifles (26" bbls) were made for "pistol" cartridges. I suppose that there could be some argument for having a rifle & a handgun that uses the same cartridge. In today's world, however, the logic escapes me.
Last edited by wtroper; 06/27/2013 4:02 PM.
It's more important where you hit 'em, than what you hit 'em with.
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Re: FPS change with barrel length
[Re: wtroper]
#133590
06/27/2013 6:57 PM
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Joined: Nov 2010
Posts: 1,101
Bearbait in NM
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W,
There is actually some logic, and a lot of nostalgia ;^) I don't think the nostalgia is hard to explain, you either get it or don't. But, one of the fun things to do with my Puma Carbine in 454 is to run the same bullets I use in my 454 pistol, and my loads for the pistol which are more plinker to mid octane actually end up out of the rifle as "hot" pistol loads. Rather than push the envelope like the OP wants to do, I can actually down load a little, have the pistol fun, and the rifle still capable. If that makes sense.
Craig
Northern born and Southern bred
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Re: FPS change with barrel length
[Re: Bearbait in NM]
#133592
06/27/2013 7:58 PM
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Joined: Jan 2009
Posts: 1,037
wtroper
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Bearbait,
I understand & agree with your post. A revolver cartridge in a rifle is very mild. The M78 Browning (26" bbl, I think) shot almost like a 22. I just could not come up with a practical use for it.
I lived NE of Lovington at the time. My pickup guns were M94 30-30 & a 41 mag revolver. The 30-30 had a longer effective range than did the 454. However, I always used the revolver if the range was within 125 yds or so. I had many other rifles but the old M94 was handy in the pickup. Plus, I grew up on a M94.
It's more important where you hit 'em, than what you hit 'em with.
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Re: FPS change with barrel length
[Re: wtroper]
#133593
06/27/2013 8:09 PM
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Joined: Jan 2005
Posts: 7,655
wapitirod
Shootist
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Shootist
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I have no experience with a 41 mag rifle. However, I have several 41 mag revolvers. I would not expect 50 fps gain per inch moving from a 14" to a 24" bbl. My only experience with a rifle in a revolver cartridge is with a 454. I owned (for a short while) a browning single shot rifle in 454. I was quite disappointed in it and did not keep it very long. I do not recall ever shooting it over a chronograph.
If I were interested in a rifle in a revolver cartridge, it would be one with a "short" bbl --- carbine length. However, the old Winchester rifles (26" bbls) were made for "pistol" cartridges. I suppose that there could be some argument for having a rifle & a handgun that uses the same cartridge. In today's world, however, the logic escapes me. yeah it's just kind of a general figure. In 45LC I had a load with a 300gr XTP that went just over 1200fps from a 7.5" revolver and the same load in my Rossi 92 @ 24" goes 1780 so a gain of not quite 600fps so following the rule I'm short by roughly 200fps. If your dealing with lengths closer together like a 6" vs 10" or a 20" vs a 24" the 50 fps rule is normally closer to accurate.
I won't be wronged. I won't be insulted. I won't be laid a-hand on. I don't do these things to other people, and I require the same from them. John Wayne-The Shootist
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Re: FPS change with barrel length
[Re: wapitirod]
#133613
06/28/2013 12:23 PM
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Joined: Jan 2013
Posts: 74
cougariii
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I am not really looking to shoot the same load per say just want to have one set of dies to work with. I am cheap so to say and it would be nice to not have to buy a bunch of different dies and holders. I already have the 41 dies so don'thave to buy any actually. I want to use the pistol mainly but thought a rifle may be a good addition. I could use either one that way. I hunt in Indiana so it has to fall in their guidleines for a rifle and the 41 does that.I would actually like to have a 35 remington cut back to 1.8 inches but that involoves a lot more work than I am willing to do.
I am only Whitetail hunting with this and of course some target to get sighted in and have fun.
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Re: FPS change with barrel length
[Re: cougariii]
#133614
06/28/2013 1:31 PM
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Joined: Nov 2010
Posts: 1,101
Bearbait in NM
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W,
I did not grow up with guns, save a few bb guns that were snuck home ;^) My first lever was a Guide Gun in 45-70, and while that gun has been wonderful and has served me well, it was not until I got the 92 in 454 that I felt like you do with the 94. Very slim gun, easy to action, carries like a dream in the woods. I even fitted some expensive wood to it, cost me more than the base gun. It makes a dandy ranch gun, where we plink and patrol.
And Coug, right now I think smart is a better word than cheap to be able to stock one type of primer, powder, bullet and brass that can go both ways. Gotta warn you though, a lever eats cartridges much faster than a pistol. Fun, hungry beast.....
Craig
Northern born and Southern bred
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Re: FPS change with barrel length
[Re: Bearbait in NM]
#133617
06/28/2013 2:23 PM
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Joined: Jan 2013
Posts: 74
cougariii
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journeyman
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It will be a contender so it will be single shot so no worries on eating rounds quick. I have aprobably a couple hundred brass right now also so Only thing have ot buy is primers and bullets.
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Re: FPS change with barrel length
[Re: cougariii]
#133618
06/28/2013 3:40 PM
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Joined: Jan 2009
Posts: 1,037
wtroper
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Cougariii,
I am a dedicated 41 mag fan. I have used 41 mag revolvers for many years. I currently own five of them. In part, I like them because they are different than what is used by most handgunners. However, I would also be quick to mention that the selection of bullets available for the 41 mag is quite limited compared to other calibers (like the 44 mag or 45). Unless you choose to go with cast bullets, reloading is often limited to the 200-210 gr range of projectiles. For your use these will likely suffice. However, just a thought to consider.
It's more important where you hit 'em, than what you hit 'em with.
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Re: FPS change with barrel length
[Re: wtroper]
#133632
06/29/2013 1:50 AM
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Joined: Apr 2006
Posts: 72
herrettman
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Your gain from 14" to longer will be small and in some loads the 14" may be higher than the longer barrel. Here is a web site that is interesting to look at in regards to barrel length and velocity, http://www.ballisticsbytheinch.com/41mag.html
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