barrel life?
Moderators: gds, bakerjw, renegade
-
- Silent Operator
- Posts: 75
- Joined: Mon Sep 05, 2016 3:42 pm
barrel life?
What can one expect from a 300 BO barrel running supersonic and the same question for running subsonic?
- gds
- Silent But Deadly
- Posts: 3711
- Joined: Thu Nov 01, 2012 9:43 am
- Location: Sandhills of North Carolina
Re: barrel life?
I wore one out in less then 4000 rounds 90% of those subs.
However I think I had a defective barrel. Which is why I will not recommend Black hole weaponry barrels.
I have at least that many plus on another barrel with no issues. mix of subs and supers.
Frankly I would say there are too many variables to give a accurate answer.
However I think I had a defective barrel. Which is why I will not recommend Black hole weaponry barrels.
I have at least that many plus on another barrel with no issues. mix of subs and supers.
Frankly I would say there are too many variables to give a accurate answer.
Yes, I am a Baptist, and yes I carry a gun. You might think I carry a gun because I don't trust God. Well you would be wrong. I have complete faith in my Lord. It is mankind I have no trust in
-
- Silent But Deadly
- Posts: 267
- Joined: Sun Apr 06, 2014 10:30 pm
Re: barrel life?
It seems that a like for like barrel would last longer than .223 since the neck isnt tapered nearly as much. I have a colt 5.56 barrel with well over 10k down it that still groups ~1" @100y.
-
- Silent But Deadly
- Posts: 1215
- Joined: Mon Oct 17, 2011 8:09 am
- Location: NW Florida
Re: barrel life?
See my post in Main Discussion Area. While I'm not specifically testing subsonic vs supersonic, I'm not seeing any difference in bbl life jump out at me with bbls that get more subsonic than supersonic fired from them. It could be that my subs are normally the longer bearing 220gr bullets so the longer bearing surface wears just as much as a shorter bearing surface, but faster going supersonic bullet. And, anyway you load it, the Blackout just doesn't use much powder compared to "conventional" hunting 30 caliber cartridges like .308, 30-06.
Re: barrel life?
The manual for an AAC MPW rifle has the following list on page 26:
http://300aacblackout.com/resources/AAC-AR-Manual.pdf
Recreational use: 50,000
Competition use: 35,000
Mission Critical: 20,000
It is a 4150 button rifle barrel that is Nitrided (Case Hardended)
It does not have chrome lining.
http://300aacblackout.com/resources/AAC-AR-Manual.pdf
Recreational use: 50,000
Competition use: 35,000
Mission Critical: 20,000
It is a 4150 button rifle barrel that is Nitrided (Case Hardended)
It does not have chrome lining.
Industry Pro Staff for Dynamic Research Technologies When One Shot is All You Get www.drtammo.com https://www.facebook.com/drtammo/
Join the Revolution http://youtube.com/watch?v=3_Xnx3BFuLk
Join the Revolution http://youtube.com/watch?v=3_Xnx3BFuLk
-
- Silent But Deadly
- Posts: 1215
- Joined: Mon Oct 17, 2011 8:09 am
- Location: NW Florida
Re: barrel life?
VERY interesting. I need to get busy and shoot more to get more data on bbl wear!A-Game wrote:The manual for an AAC MPW rifle has the following list on page 26:
http://300aacblackout.com/resources/AAC-AR-Manual.pdf
Recreational use: 50,000
Competition use: 35,000
Mission Critical: 20,000
It is a 4150 button rifle barrel that is Nitrided (Case Hardended)
It does not have chrome lining.
-
- Silent Operator
- Posts: 75
- Joined: Mon Sep 05, 2016 3:42 pm
Re: barrel life?
I guess since I am using sub-sonic loads for hunting coyotes this barrel will last 'til Jesus comes.Whole Bunches wrote:VERY interesting. I need to get busy and shoot more to get more data on bbl wear!A-Game wrote:The manual for an AAC MPW rifle has the following list on page 26:
http://300aacblackout.com/resources/AAC-AR-Manual.pdf
Recreational use: 50,000
Competition use: 35,000
Mission Critical: 20,000
It is a 4150 button rifle barrel that is Nitrided (Case Hardended)
It does not have chrome lining.
-
- New Member
- Posts: 8
- Joined: Mon Jan 16, 2017 2:24 pm
Re: barrel life?
There is a nice worksheet here which summarizes most of the variables involved. You can download it here:
http://www.accurateshooter.com/technica ... rrel-life/
It basically boils down to the effective chamber pressure, specific energy of your chosen powder, amount of powder used and the bore diameter. The worksheet doesn't take barrel heat, barrel and projectile material into account but if you keep the barrel temps reasonable these are decent estimates.
Example of one of my sub loads: 208gr ELD-X, 11.0gr H4198, 0.020" jump, estimated 25,000CUP. That apparently gives me 136K shots (yeah right...) The barrel heats up considerably from shot to shot though so it's likely closer to 50K rounds before the muzzle starts to fishmouth and throat needs to be chased a bit.
One supersonic one I use: 150gr HDY FMJBT, 15.0gr H110, 0.020" jump, estimated 36,000CUP. About 50K rounds with cooling. Probably cut that in half with heating. With a max load of 17.2gr, you are at 21,000 rounds. Either way you slice it, you will be in the 5 digit realm of rounds down the barrel if you don't purposely cook the tube.
[Note:These are technically not published loads. Powder charges are within range of Hodgdon's manual but the ELD-X is not a listed projectile: for that reason I have not listed COAL. You must tailor that to YOUR setup, since seating depth can drastically change pressure or cause a compressed loading condition, which can be dangerous.)
shoe
http://www.accurateshooter.com/technica ... rrel-life/
It basically boils down to the effective chamber pressure, specific energy of your chosen powder, amount of powder used and the bore diameter. The worksheet doesn't take barrel heat, barrel and projectile material into account but if you keep the barrel temps reasonable these are decent estimates.
Example of one of my sub loads: 208gr ELD-X, 11.0gr H4198, 0.020" jump, estimated 25,000CUP. That apparently gives me 136K shots (yeah right...) The barrel heats up considerably from shot to shot though so it's likely closer to 50K rounds before the muzzle starts to fishmouth and throat needs to be chased a bit.
One supersonic one I use: 150gr HDY FMJBT, 15.0gr H110, 0.020" jump, estimated 36,000CUP. About 50K rounds with cooling. Probably cut that in half with heating. With a max load of 17.2gr, you are at 21,000 rounds. Either way you slice it, you will be in the 5 digit realm of rounds down the barrel if you don't purposely cook the tube.
[Note:These are technically not published loads. Powder charges are within range of Hodgdon's manual but the ELD-X is not a listed projectile: for that reason I have not listed COAL. You must tailor that to YOUR setup, since seating depth can drastically change pressure or cause a compressed loading condition, which can be dangerous.)
shoe
Re: barrel life?
If can ever spend enough money in ammo to wear out a barrel, I can probably afford a new barrel...
Re: barrel life?
One factor to consider with 300 BLK is also powder selection.
Powders like Lil' Gun are quite a bit hotter burning than powders such as VV.
Powders like Lil' Gun are quite a bit hotter burning than powders such as VV.
"Don't tell fish stories where the people know you; but particularly,
don't tell them where they know the fish."
--Mark Twain
don't tell them where they know the fish."
--Mark Twain
Who is online
Users browsing this forum: No registered users and 7 guests