So. 2019 is here. And I want to start my research for this year's project, which will be a gas gun in 6.5CM. I don't reload, and have neither the time, the space nor the patience to reload, so I will be using factory loads exclusively. My question is, how do I figure out the best barrel length to burn all (or as much as possible) the powder of a given cartridge? I see a lot of bolt actions in aforementioned caliber in 24"-26", which would be more than I'm comfortable with in an AR 10 platform. Is there a formula I can apply? And, in your experience, what kind of velocity could I expect fron an 18-20" barrel (average speaking)?
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Question for reloaders and ammo specialists.
- Thread starter frenchman
- Start date
Im going to gander your looking at about 100-150fps loss from 26-20" depending on bullet weight.
I would not worry much about powder burn. Again i have no real data or but i think the powder would be all used up before the gas port.?
I would not worry much about powder burn. Again i have no real data or but i think the powder would be all used up before the gas port.?
Last edited:
Lip
Army Veteran
If you learned reloading there is this American Reserve Munitions Announce Flashless Gunpowder ~ VIDEO
Considering the muzzle velocity from a factory load, you're not going to lose anything noticeable.
Throw in a gas blowback system,still not a big deal unless you're going for a thousand yard hit.
In relative terms, its the equivalent of taking 20 lbs from a 2000 lbs.
The only thing you might run into with factory vs reloaded is larger f.p.s. spread, and again, that might not even be noticeable.
Throw in a gas blowback system,still not a big deal unless you're going for a thousand yard hit.
In relative terms, its the equivalent of taking 20 lbs from a 2000 lbs.
The only thing you might run into with factory vs reloaded is larger f.p.s. spread, and again, that might not even be noticeable.
I would go as long as you are willing (but not past ~24/26 inches) If that is 20 inches for you, than so be it. (I think 20 is the shortest I would go personally, with 6.5 creedmore, but I would rather have a 24 inch).
Here is a good reference with factory loads at many different barrel lengths.
https://rifleshooter.com/2016/02/6-...el-length-on-velocity-cutting-up-a-creedmoor/
Here is a good reference with factory loads at many different barrel lengths.
https://rifleshooter.com/2016/02/6-...el-length-on-velocity-cutting-up-a-creedmoor/
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