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9/22/2017 12:11:25 AM
Posted: 11/6/2013 10:12:44 AM EDT
I have two AR 15's one with a 16" 1 in 8 barrel and one with a 20" 1 in 9 barrel. I was reloading different bullets to different OAL according to the bullet manufacturers. Then I decided to load them all to 2.255 and was surprised to find they all shot better with the longer OAL.
Has anyone else found this to be the case with your OAL ?
Link Posted: 11/6/2013 10:38:59 AM EDT
Link Posted: 11/6/2013 10:45:53 AM EDT
"Almost" without exception your going to have a more accurate load with the bullet seated as close to the rifling as possible. The problem is the magazine. You can only load to the length of your mag IF you are going to use it. Often High Power, and others, will load heavy, long bullets seated near or into the lead. These loads far exceed the length of the mag and must be hand fed. Yes! You have discovered a very important "secret" to accuracy, whether in an AR or a bolt, single shot.
Link Posted: 11/6/2013 12:02:32 PM EDT
I had previously loaded a few bullets to 2.200, 2.230 and 2.240 but the 2.255 out shoots them all.
I was just curious as to how many of you fellows load your AR to 2.255.
Link Posted: 11/6/2013 12:11:56 PM EDT
I load all my rapid fire and standard ammo to the .255 and verify any new mags that i buy. Works for me and i'm VERY happy with the accuracy.
Link Posted: 11/6/2013 3:26:40 PM EDT
I haven't noticed any difference in accuracy with 55-62 grain bullets with different seating lengths. Most bullets in an AR still have a long distance to the lands loading to magazine length. For instance, in 2 popular brand AR's a 55 gr.Hornady fmj has to be seated out to 2.370" to 2.390" to touch the lands I seat Hornady 55 fmj's to 2.218-2.230" and military or other sharp tipped fmj's to 2.250". It can make a difference but usually doesn't in most AR's.
Link Posted: 11/6/2013 3:39:38 PM EDT
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Originally Posted By rg1:
I haven't noticed any difference in accuracy with 55-62 grain bullets with different seating lengths. Most bullets in an AR still have a long distance to the lands loading to magazine length. For instance, in 2 popular brand AR's a 55 gr.Hornady fmj has to be seated out to 2.370" to 2.390" to touch the lands I seat Hornady 55 fmj's to 2.218-2.230" and military or other sharp tipped fmj's to 2.250". It can make a difference but usually doesn't in most AR's.
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Ditto, most military chambers and many rifles have a very long throat. "Magazine length" is usually where you want to be in most conventional rifles.
Link Posted: 11/7/2013 5:29:58 AM EDT
Originally Posted By rebs:
I have two AR 15's one with a 16" 1 in 8 barrel and one with a 20" 1 in 9 barrel. I was reloading different bullets to different OAL according to the bullet manufacturers. Then I decided to load them all to 2.255 and was surprised to find they all shot better with the longer OAL.
Has anyone else found this to be the case with your OAL ?
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I never even look at what the load manual lists for OAL, never.

It means absolutely nothing to the handloader and his/her firearm.
Link Posted: 11/7/2013 6:54:11 PM EDT
I load everything to 2.235
Link Posted: 11/8/2013 1:13:04 AM EDT
All my loads are to mid canal, so case trim length determines OAL.

With Hornady 55gr fmj-bt, I'll have OAL variance of .02" lot to lot

(usually 600 rds in a lot) depending on how consistently I set up

LE Wilson trimmer and Lee seating die. I have yet to notice a

difference in accuracy, but that's more to do with my skill level

than with OAL.
Link Posted: 11/8/2013 7:02:30 AM EDT
I seat to cannelure [2.20~] on the Hornady and MG 55gr FMJ-BT. non-cannelure i seat to 2.25
Link Posted: 11/8/2013 7:52:43 AM EDT
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Originally Posted By jim:
I seat to cannelure [2.20~] on the Hornady and MG 55gr FMJ-BT. non-cannelure i seat to 2.25
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This is exactly what I do as well. All of my non cannelure bullets are pretty long, so they get seated at 2.25.
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