Gunsmithing Factory remngton barrels

[ukshooter]

Every knows factory remington barrels have a long throat,my COL is 2.915.
So if you've 26 inch tube,is your barrel really 26 inch long ?.
I'm thinking mines probably 25.90,accounting for the long throat.
As anybody got any answers ?.
The reason is I've putting 26 inch barrel into quick load for years,just wondering if I would be better putting real length in.
Ok i know it sounds a little anal.but its kinda bugging me.

 

[Red_SC]

Re: Factory remngton barrels

The barrel length is measured from the bolt face, not the beginning of the lands.

 

[GasLight]

Re: Factory remngton barrels

agree that the barrel is typically measured from the bolt face to the muzzle, but performance is definately dictated by the lead length as well. You might try 25.9 and see if you get better results from quick load. My guess is that .1" won't make a very noticable difference at all.

DD

 

[ukshooter]

Re: Factory remngton barrels

I know what you saying,just trying to find out how much usable rifling there is in the barrel.

 

[GasLight]

Re: Factory remngton barrels

The leade length is something I guess people give little thought to when thinking about barrel length. I am sure if you play around in quick load, see how much difference .1" at a time will make, and if it is enough to match your real world dope, rock it. My guess is that it will be very nominal. Now think about the actual difference in a long chamber vs a tight one and then you are playing with .01" at a time not .1". This is why most people wouldn't mess with barrel length calcs in their ballistic program or drop charts.

 

[ukshooter]

Re: Factory remngton barrels

I've had some great results shooting factory remington .308 barrel,and playing around with quick load.But having a 2.915 COL,is hardly sammi speck.

I'm trying to figure out a way to measure the length of rifling,and I'll have play around with quick load.
Maybe I'm just a dog chasing it's tail,but hey it's worth a try.

 

[GasLight]

Re: Factory remngton barrels

Well real world is going to speak way louder than whatever you can figure for your rifling length and inputting into quickload. That said, you could get a "plug" (this could be a flat base bullet turned backwards) that is the same diamtere as your lands, and then push it up into the chamber until it reaches the lands, and then run a cleaning rod until it makes contact, then you can see the distance from the start of the rifling to the muzzle.

OAL is also a function of the bullet used and its ogive. There are many different chamber reamers out there for .308, I don't know which Remington uses, but I am sure it has a generous throat to accomodate any factory ammo out there, using many many different bullets and ogives. Your OAL length measurement would change as you change bullets...

Dave

 

[Hummer]

Re: Factory remngton barrels

I think you are worried about something you have no control over. Bottom line is if it shoots well keep shooting. If it doesn't you need a barrel. Over there I would get a Border Barrel and run with that.
I have seen a barrel with no rifling for three inches in front of bore that shot 1.5" at 300 yards day in and day out. It was cut off three inches and rechambered at it still shot 1.5" at 300.
I have a 30.06 that is tired and I have to seat a 190 out .300 over OAL to find the rifling but it still shoots quite well.
Life is too short to worry about what you are worrying about and nothing you can do about it anyhow. Computer programs are not necessarily the answer to everything.

 

[Wild_Bill]

Re: Factory remngton barrels

Hi UK the barrel is Sammi spec. it is designed to chamber ANY 30 calibre projectile and still function when the cartrige is loaded to 2.810" I have a new chamber in my 308 and with one 155gr projectile it is 2.745 loaded to the lands and with the same companies 155gr VLD it is 2.855 loaded to the lands now i could say it is not SAMMI because one is shorter than SAMMI and one is longer. i have 85 thou freebore and it is designed for shooting 155gr palma projectiles.

The chamber i have would likley work for you with the projectiles you have but it would not chamber a 180gr round nose projectile loaded to 2.800" as the factory remington has to to be safe.

You are trying to say because the projectile you have decided to shoot does not touch the lands at 2.810 that the chamber is out of spec that is not what it is at all.

Now about the barrel length issue you have taken 100 thou off 26" and thought that would get you the actual rifling length you must also take off the 2" of case length that is in therte aswell so your true rifling length would be closer to 23.8" than 26" but this will not work at all if you remove this length. Quick Load recognises that their is a chamber there and works out the expansion ratio of the actual volume of the barrel and inside of the case to give you the correct values if you load the cartrige longer quick load has already taken this into account.

My advice just use 26" as your barrel length and run with it as i have tested 4 diferent 26" heavy barreled 308's with 7 diferent military ammo batches and tyheir was 300 fps diference between the highest and lowest velocities of the same ammo in the diferent rifles and the ammo seemed to be fastest in the rifles that the country that the ammo and barrel combination was manufactured. As the heavy barrel from Australia was the fastest with Austrtalian L2A2 ball ammo and the Steyr SSG was the slowest but using german ball the SSG was fastest and the Australian barrel the slowest.

Quick Load can only get you so far the rest has to be real world testing so get out from behind the computer and start to shoot and then the testing you do will be correct.
Quick Load is great to help you compare the components that you think will be optimum but then you will have to tyst them in real life to find the one that actualy performs the best in your rifle.