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55gr FMJ's are not known as MOA ammo so don't expect stellar results from them. To prove that the gun is capable of MOA accuracy I would buy some factory loaded ammo with V-max bullets (i.e Fiocchi, Hornady) and see how they group just to rule out the gun and verify that it is your reloads that are having the issue. V-max are consistently more accurate than most other ammo. A 1:7 twist can easily shoot 40, 50 and 55gr V-Max with MOA results. If you're not shooting close to MOA with those it's not the loads and it's most likely the gun/scope or the shooter.
If you want and idea of what kind of accuracy some factory rounds can get here's a link.
.223 / 5.56 Ammo Test
Good luck.
-CodyComment
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+1^^^
jumbopanda; Load up 10 rounds each in increments of .2, .4, or .5 grains difference in powder for each 10 round batch. Shoot 5 rounds at each target then switch to the next load. See where your groups start to tighten up. Re-confirm your data with the other 5 rounds (maybe on another day). Once you get close, switch to .1 grain increments and repeat the test. You will either find a good load, or not. If not, try another powder. When testing in an AR, you might want to load each round singly through the ejection port (leave the magazine in the gun) and push it forward with either a plastic or wooden stick before hitting the bolt release. Loading the cartridges that way will help eliminate one factor in your struggle for accuracy.
I checked my Quickload program using TAC powder with the Hornady 75gr BTHP bullet. It shows a low of 18 grains and a high of 21 grains.
jumbopanda, you didn't say how much powder you used.*
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If this is a brand new barrel, the effort should be spent breaking it in before determining your ultimate tack driver round. You didn't even mention a cleaning regimen for this new barrel.
IMHO, weighing brass, etc. is saved for the real benchrest guys. I do like to trim all brass originally, then keep sorted by number of fires (they should stretch similarly). For rounds I'll likely shoot in a semi, I like to "factory" crimp.
Not sure what you meant by "headspace long". Your re-sized brass, the fired brass? As long as possible and still chamber tends to be best for accuracy alone, but of course reliable feeding is a requirement for most semi shooting.Last edited by JagerDog; 06-15-2011, 12:27 PM.Palestine is a fake country
No Mas Hamas
#BlackolivesmatterComment
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WHERE ARE ALL THESE PEOPLE WHO SHOOTS SUB-MOA WHEN IM AT THE RANGE?!?!?!?!?!?!?!?!?!?!?!?!?!?! And I use to go 2-3 times per week at 2 diffrent ranges!!
Anyways, most people said it. stick to one and work up loads...if it didnt work, change one component and try again.Originally posted by GottmitunsComment
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ha ha...true.
I remember when I was like 12 (I just turned 50) and I was shooting 1-1.5 MOA out of my deer rifle (.264 Win Mag). The guy in the next bench was bragging about some elk he shot at some loooooong distance. Then I could hear him whoop and holler that this ol' rifle was coming right in. I expected to see something truly exemplary. I moved my scope over to his target and saw holes all over the paper. "Coming right in" was hitting the black.
I've got one rifle I pretty much expect sum MOA at 100 (with the right load). It's a Kimber of Oregon in .223. It's no bench rest gun, being a sporter barrel, but nickle to quarter sized groups are pretty typical. That's with 20X magnification and sandbags.Palestine is a fake country
No Mas Hamas
#BlackolivesmatterComment
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I'm not a good shot by any means but come out to Angeles Shooting Range with me next time and I'll show you. I did several groups under and around .5MOA 2 weekends ago with my custom Rem LA 308 built for Palma. I'll find the targets and try to take pics.
under-MOA is easy to achieve. Here is set of targets I did with an Armalite AR-10T some time ago at 100 yards. First group was with cold cleaned bore.
Edit: if you come to the range with me, i'll show you how easy it is to shoot under MOA with a capable rifle.Last edited by huckberry668; 06-16-2011, 1:17 PM.GCC
NRA Certified Pistol Instructor
Don't count your hits and congratulate yourself, count your misses and know why.Comment
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^ Im not saying it can't be done but so many claim to have shot sub-MOA with 16" carbine and irons with bad eyes, some standing, some prone, off hand, sling, no sling.. It just gets crazy..Originally posted by GottmitunsComment
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yeah, that is kind of funny. I call those guys 'e-snipers'. I saw someone shooting something interesting at the range one time and asked how the gun was shooting. He pointed to 3 bullet holes within 1" among 100s of others peppered the 18"x18" (or so) target and said it shot less than MOA...
you know, i do have a Armalite AR15-T 16" upper that consistantly shoot less than MOA with my handloaded ammo (SMK 69 over 25gr Varget & Rem 7.5 primer and SMK 53 over 25.5 IMR4895 and Rem 7.5). using 14x Lupy Mk4 scope and 3.5lb trigger.GCC
NRA Certified Pistol Instructor
Don't count your hits and congratulate yourself, count your misses and know why.Comment
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lol, I see that all the time...As for shooting, I think this was the last time I ever shot for groups and I think I did alright...not the best but alright:
After that I been concentrated on run-n-gun so...I havent gone out to test my new loads..
I knew I should of waited for you! :P
Originally posted by GottmitunsComment
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That's perfectly good shooting. I noticed you were single-loading instead of using your mag. I do the same thing when I'm shooting for groups. I think it makes for more consistent loading into the chamber, and less impact on the bullet, since it's not being stripped out of the mag and banged around on its way in. I could be wrong, but it seems right to me.Comment
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