Forums
New posts
Search forums
What's new
Articles
Latest reviews
Author list
Classifieds
Log in
Register
What's new
Search
Search
Search titles and first posts only
Search titles only
By:
New posts
Search forums
Menu
Log in
Register
Install the app
Install
Forums
Rifles, Reloading, Optics, Equipment
AR15/10 Rifles
300 WSM AR10
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Message
<blockquote data-quote="budlight" data-source="post: 2511010" data-attributes="member: 2939"><p>I don't know everything, But I never have built a AR that pierced the primer or required excessive buffer weights. I also never went down the service rifle low pressure road. I never bought factory ammo. I always just use the fast powder dump and a single stage or my electronic powder dump if I am trying for real competition rounds.</p><p></p><p>I first started out on ar15's with SS match barrels all rifle length gas tubes and I came across an article about pressures inside the barrel at the carbine , mid length, and rifle length gas port holes. So as you see pressure going down requires a bigger gas port hole to cycle the rifle. </p><p></p><p>So I reasoned, Why not ask the manufacturer to only drill mid length or even carbine sized hole for my rifle length barrel because I am going to be running full powered reloads of mine. It will bleed off less pressure and get higher velocity and not beat the crud out of the buffer weight and parts. You can always make a hole bigger. So I asked for an .078 and it worked wonderfully with light springs and buffer weight. Of course the full auto heavy NB bolt bcg. rifle length 20 inch. So my next barrel I went even smaller with a .073 and it also worked like a champ with a rifle length same .750 micro non adjustable gas block.</p><p></p><p>I carried the same reasoning over to my AR10 rifle plus 2 inch. please only drill a smaller .081 hole because I am running near flattened primer full powered 308 rounds through it. If it doesn;t work I will send it back. All three of my ar10s work like a champ and I have a non adjustable block on one of them. TAC and CFE 223 are my main powders.</p><p></p><p><strong>This is just a list of the common gas port hole sizes that barrel manufacturers seem to use.</strong></p><p></p><table style='width: 100%'><tr><td>AR-15 Platform 5.56mm</td><td></td><td></td><td></td><td></td></tr><tr><td>20"</td><td>rifle</td><td>5.56</td><td></td><td>0.0935</td></tr><tr><td>20"</td><td>rifle</td><td>5.56</td><td></td><td>0.096</td></tr><tr><td>20"</td><td>rifle</td><td>5.56</td><td></td><td>0.098</td></tr><tr><td>16"</td><td>mid</td><td>5.56</td><td></td><td>0.078</td></tr><tr><td>16"</td><td>mid</td><td>5.56</td><td></td><td>0.081</td></tr><tr><td>16"</td><td>car</td><td>5.56</td><td></td><td>0.0625</td></tr><tr><td>16"</td><td>car</td><td>5.56</td><td></td><td>0.065</td></tr></table><p></p><p></p><p>18"rifle 0.308 0.0960</p><p>18"car 0.308 0.0635</p><p>16"mid 0.308 0.078</p><p>16"mid 0.308 0.081</p><p>16"car 0.308 0.07</p><p>16"car 0.308 0.073</p><p>16"car 0.308 0.076</p><p>20"rifle 0.308 0.0935</p><p>20"rifle 0.308 0.096</p></blockquote><p></p>
[QUOTE="budlight, post: 2511010, member: 2939"] I don't know everything, But I never have built a AR that pierced the primer or required excessive buffer weights. I also never went down the service rifle low pressure road. I never bought factory ammo. I always just use the fast powder dump and a single stage or my electronic powder dump if I am trying for real competition rounds. I first started out on ar15's with SS match barrels all rifle length gas tubes and I came across an article about pressures inside the barrel at the carbine , mid length, and rifle length gas port holes. So as you see pressure going down requires a bigger gas port hole to cycle the rifle. So I reasoned, Why not ask the manufacturer to only drill mid length or even carbine sized hole for my rifle length barrel because I am going to be running full powered reloads of mine. It will bleed off less pressure and get higher velocity and not beat the crud out of the buffer weight and parts. You can always make a hole bigger. So I asked for an .078 and it worked wonderfully with light springs and buffer weight. Of course the full auto heavy NB bolt bcg. rifle length 20 inch. So my next barrel I went even smaller with a .073 and it also worked like a champ with a rifle length same .750 micro non adjustable gas block. I carried the same reasoning over to my AR10 rifle plus 2 inch. please only drill a smaller .081 hole because I am running near flattened primer full powered 308 rounds through it. If it doesn;t work I will send it back. All three of my ar10s work like a champ and I have a non adjustable block on one of them. TAC and CFE 223 are my main powders. [B]This is just a list of the common gas port hole sizes that barrel manufacturers seem to use.[/B] [TABLE] [TR] [TD]AR-15 Platform 5.56mm[/TD] [TD][/TD] [TD][/TD] [TD][/TD] [TD][/TD] [/TR] [TR] [TD]20"[/TD] [TD]rifle[/TD] [TD]5.56[/TD] [TD][/TD] [TD]0.0935[/TD] [/TR] [TR] [TD]20"[/TD] [TD]rifle[/TD] [TD]5.56[/TD] [TD][/TD] [TD]0.096[/TD] [/TR] [TR] [TD]20"[/TD] [TD]rifle[/TD] [TD]5.56[/TD] [TD][/TD] [TD]0.098[/TD] [/TR] [TR] [TD]16"[/TD] [TD]mid[/TD] [TD]5.56[/TD] [TD][/TD] [TD]0.078[/TD] [/TR] [TR] [TD]16"[/TD] [TD]mid[/TD] [TD]5.56[/TD] [TD][/TD] [TD]0.081[/TD] [/TR] [TR] [TD]16"[/TD] [TD]car[/TD] [TD]5.56[/TD] [TD][/TD] [TD]0.0625[/TD] [/TR] [TR] [TD]16"[/TD] [TD]car[/TD] [TD]5.56[/TD] [TD][/TD] [TD]0.065[/TD] [/TR] [/TABLE] 18"rifle 0.308 0.0960 18"car 0.308 0.0635 16"mid 0.308 0.078 16"mid 0.308 0.081 16"car 0.308 0.07 16"car 0.308 0.073 16"car 0.308 0.076 20"rifle 0.308 0.0935 20"rifle 0.308 0.096 [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Rifles, Reloading, Optics, Equipment
AR15/10 Rifles
300 WSM AR10
Top