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Old 04-07-2018, 07:01 PM   #1
CjStatic
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Default 55g or 62g accuracy

I shoot 1/7 barrels. DD and Lwrc. It seems my groups are much tighter with 55g federal vs the green tip 62 grain. What is your guys experience ?
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Old 04-07-2018, 07:08 PM   #2
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Yes 55gr is more accurate in my experience. 62 grain is less accurate because it's hard to make the penetrator bullets as consistently as the FMJ 55gr.
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Old 04-07-2018, 07:45 PM   #3
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try some 68/69gr match ammo and see a real difference
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Old 04-07-2018, 07:48 PM   #4
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Anybody shooting the 77gr stuff?
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Old 04-07-2018, 07:49 PM   #5
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I shoot mostly the 55 gr. ammo...its very accurate for the shooting I do. I shoot the 62 gr. mostly as a "see what I can punch a hole thru" type of event...its accurate but never really took it out too far either...maybe 200 yds at most.
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Old 04-07-2018, 08:15 PM   #6
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I kinda always figured the heavier 62 would be more accurate. Guess not. I’ll have to try some 69 & 77 grain stuff sometime.
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Old 04-07-2018, 08:17 PM   #7
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I get slightly better accuracy outta my colt's (1/7) with 55gr but it's not enough for me to care. I buy whichever is cheaper.
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Old 04-07-2018, 09:58 PM   #8
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Supposedly simply due to barrel harmonics, 55gr should always be more accurate than 62 with a 1/7 twist.

Source: “The M16”; Gordon L Rottman
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Old 04-07-2018, 10:37 PM   #9
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Yup from what I've experienced and read 2-3 MOA is not atypical for Greentip. In my view there is very little reason to use Greentip as a civilian unless you are worried about having to defeat polyethylene and certain ceramic body armor. Other than that M193 is better in terminal ballistics and external ballistics.
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Old 04-07-2018, 11:54 PM   #10
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It may depend on the barrel length and how hot the ammo is.

Some 55 grain FMJ ammo suffers from jacket damage with 7 inch rifling if the velocity is high.

The weaker jacketed bullets are usually good for about 3000 fps in 7 inch rifling.

Faster and it may become far less accurate.

The Serbian Prvi 55 FMJ bullets have a tough jacket and can take the 7 inch rifling at high velocities without loss of accuraycy.

The Hornady and Sierra 55 grain FMj bullets are accurate with slower rifling or when velocities are kept under 3000 fps with 7 inch rifling.

Some American commercial ammo and even some military ammo can suffer from jacket damage in 7 inch rifling when the velocities are high.

Try out some ammo before buying a lot of it.

The 62 grain lead core bullets from Hornady and the older Speer ones, (no longer available) are accurate.

The 62 grain lead core bullets from Prvi and Armscor are not very accurate.

The 62 grain penetrator bullets from Prvi are more accurate than the Prvi 69 grain and 75 grain, "match" bullets.

Prvi is using powder from Belgium now.
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Old 04-08-2018, 12:53 AM   #11
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Quote:
Originally Posted by Rev06 View Post
Yup from what I've experienced and read 2-3 MOA is not atypical for Greentip. In my view there is very little reason to use Greentip as a civilian unless you are worried about having to defeat polyethylene and certain ceramic body armor. Other than that M193 is better in terminal ballistics and external ballistics.
Personally, and YMMV, my "oh shit" magazine's alternate M855 and M193 1:1 until the last three rounds which are tracer, and my ammo stock is all XM855. But I'm an asshole and that's just me.
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Old 04-08-2018, 01:37 AM   #12
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Ive always found 62 grain M855 to be less accurate at 100+ yards than 55 grain M193. For real accuracy, there are premium and match grade loads that generally run heavy, but those are what you'd want for a more precision minded rifle.

At close range, I've not noticed enough difference to matter. When bedside, my AR has a magazine loaded with Lake City M193 in it for the higher likelihood of fragmentation. When I go to work, it's loaded with M855 for the superior penetration capability because I'm more likely to need to punch through auto glass, car bodies, cinder block construction, etc.

None of the things I expect of my rifle require extreme precision. Inside of a hundred yards, they all work well for me, and that is the maximum range I need from my rifle with inside 50 being far more likely.
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Old 04-08-2018, 09:28 AM   #13
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55gr. in all my 1/7 barrels
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Old 04-08-2018, 11:33 AM   #14
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Depends on the rifle from my experience.

62gr and heavier is more accurate in my Colt LE6920 Upper (Standard FSB model) yet 55gr yielded better accuracy from a PSA Freedom upper.

My SLR106UR Pistol likes the lighter 55gr stuff.

All of them could be more accurate with heavier 69gr and 77gr SMK's.
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Old 04-08-2018, 11:50 AM   #15
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I'v found American M855 ammo to be less accurate than European SS109 ammo.

Winchester is not great and Federal is better, but Prvi and few other European ones seem better yet.

The Turkish stuff may not be so good though.
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Old 04-08-2018, 11:59 AM   #16
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In my Colt AR15A4: 55gr shoots about 3 moa at best, never tried green tips as they cost more & are generally a poor soft tissue performer I've read. Now my go to load is IMI 69gr, holy shit that stuff shoots bug holes! Sub moa easily, which I thought was good for a chrome lined off the shelf barrel. Bonus points for the IMI as it prints the same as M855A1 at close range.
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Old 04-08-2018, 12:36 PM   #17
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Quote:
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Anybody shooting the 77gr stuff?
The 77 grain is awesome in all regards out of a 1:7, aside from the price. I've not seen better than 3moa out of m855 from any rifle/barrel, and typically see around 2moa out of most m193.
Non m855 62 grain does seem to hold better accuracy at distance from a 1:7 than 55 grain does. Probably mainly due to the higher BC of the heavier bullet. Every single one of them is pretty damn fun to shoot inside of 300 though. Buy what's cheap and shoot more of it.
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Old 04-08-2018, 01:06 PM   #18
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Anybody shooting the 77gr stuff?
Yeah I shoot nothing but 77gr noslers with 24 grains of TAC and lake city brass. They are much more accurate than your typical mil-spec 55-62 stuff.

If you care about accuracy you should really get into handloading. It doesn't cost a lot (your time is the most expensive part) and then you can make ammo for any rifle or pistol that you have.
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Old 04-09-2018, 10:36 AM   #19
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I was at the range once shooting my Colt 1/7. This clown came up and started talking during the target change. He made this statement that you couldn't shoot 55 gr out of a 1/7 twist as the bullet would disintegrate just out of the barrel. He then looked at my nicely tight group on my targets. He asked what grain I was shooting, I said 55 gr. He got a shocked look on his face, and I just walked away! Still Laugh about that.
My best groups were with Federal 68gr BTHP match, but Georgia arms used to make a 70gr SP that did almost as well.
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Old 04-09-2018, 11:25 AM   #20
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The 77gr SMK OTM is some very fine ammo for 5.56. Speer Gold Dot .223 64gr SP is also really nice.
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Old 04-09-2018, 04:36 PM   #21
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Anybody shooting the 77gr stuff?
I bought a couple boxes of Fiocchi 77gr SMK last year for shits and grins. I think I've shot all of 8 rounds of it. 3 rounds to get my scope dialed in and one 5 round group out of my Aero OEM midlength 16" rifle. All 5 rounds went inside a 1" square at 100 yards so the group was at least 1 MOA. I didn't get out the calipers or anything and measure exactly how small. I just remember being pleasantly surprised with that barrel and milspec trigger.

I really want to group some of this stuff out of my M90NP to see what the potential is there. My HD mags are filled with 75gr Gold Dot, and I'd like to group this stuff eventually also with a scope at 100. When sighting in my red dot at 50 yards on the same Aero rifle with Gold Dots it made a nice little ragged cloverleaf group.
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Old 04-19-2018, 12:54 PM   #22
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In theory a 1/7 barrel ought to shoot more accurately with heavier grain bullets. I have a 1/7 but all that is available at Walmart is 55 grain. Once, my local gun shop got 62 and that day I was zeroing in a new scope----decision time. I decided to go with the 55 since that is what I am probably going to be shooting unless I make a special effort and order heavier bullets. In any SHTF situation it will be 55 because that is what's available. So, I just go with 55.
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Old 04-19-2018, 01:00 PM   #23
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Quote:
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In theory a 1/7 barrel ought to shoot more accurately with heavier grain bullets. I have a 1/7 but all that is available at Walmart is 55 grain. Once, my local gun shop got 62 and that day I was zeroing in a new scope----decision time. I decided to go with the 55 since that is what I am probably going to be shooting unless I make a special effort and order heavier bullets. In any SHTF situation it will be 55 because that is what's available. So, I just go with 55.
Must be a california thing... While I've personally got several cans of XM855 sitting in my closet, even the local Academy has 62gr "green tip" winchester (It's an ugly paint dip that's MUCH thicker than the green on the Lake City). Have you tried different stores to see what they have for ammo?
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Old 04-19-2018, 10:33 PM   #24
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Why are we discussing accuracy of M193 and M855 in the same sentence? If the steel core is cast off center you have a formula for tumbling, and inaccuracy. 62grain SP or FMJ is a different deal.
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Old 07-10-2018, 02:49 PM   #25
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What about the hornady American Gunner 55g hp 223? Anyone have experience with this round out of a 20" barrel? I've read that it is good past 300 to about 500. Can anybody prove or disprove this?
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Old 07-11-2018, 03:47 AM   #26
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Quote:
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What about the hornady American Gunner 55g hp 223? Anyone have experience with this round out of a 20" barrel? I've read that it is good past 300 to about 500. Can anybody prove or disprove this?
Where did you hear it?
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Old 07-11-2018, 11:51 AM   #27
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At up to 300 yards on a calm day, it will be hard to beat the 60 grain VMax bullet. The heavier BT bullets will outshoot it on windy days and longer ranges, but it is superbly accurate in good conditions.
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Old 07-11-2018, 02:10 PM   #28
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Ahhh. So it's good up to 300. I read some reviews on midway USA and wanted some real knowledge.
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Old 07-11-2018, 03:53 PM   #29
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Wish we would get more Magtech 62g LC 5.56.

Hot and accurate.
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Old 07-11-2018, 10:07 PM   #30
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Quote:
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I really want to group some of this stuff out of my M90NP to see what the potential is there.
My M90NP REALLY likes 62 grain Hornady SP, either boat tailed or core-lokt with a charge of H335. M90NP is no tack driver, but I was very pleasantly surprised by this load. Ive tried (each bullet weight with various charges) 55, 62, 69, 77 & 80 grain projectiles in the M90NP. It is most accurate so far with the 62 gr, but more experimentation needs done with the heavier. Midway has a clearance going on blems/2nds. I was consistently getting 6-8" groups at 400 yards today. Not great, but its better than factory ammo. 500 & 600 gongs were hard to hit, but I did get 4/10 rounds on the 600 with it. Couldnt hit the 500 at all.
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