77 grain 556 vs 62 grain 556 green tip

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Home Forums The Armory – Gear and Equipment Ammunition 77 grain 556 vs 62 grain 556 green tip

  • This topic has 12 replies, 11 voices, and was last updated 2 years ago by HitsCount. This post has been viewed 151 times
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    • #108652
      Civilianresponder
      Participant

        Getting ready to make a purchase and I’m wondering if it’s worth while to buy some more expensive 77 grain for combat loads or just stick with quality 62 grain 855 (I already have a bit of this). I use wolf gold 55 grain for training.

      • #108653
        Mike Q
        Participant

          Buy a box of each and figure out which works best for your barrel. Then buy the right one in bulk.

        • #108654
          TC
          Participant

            I have some 77gr and a 4-14x scope for DMR style shooting. I get ~1MOA out of my 16″ BCM ELW 1:7 barrel with it. Seems unnecessarily expensive to use it for dynamic stuff at closer ranges though. But if I had to reach out 500-800 yards with 5.56 then I would prefer 77gr for sure.

          • #108655
            Keeper
            Participant

              77 grain is a good round for DMR shooting and TC is right it will reach out to 500-800yrds

            • #108656
              BrigandActual
              Participant

                It depends on your needs, honestly. I you need the range/accuracy? Are you willing to sacrifice barrier performance to get there?

                77gr SMK loads have ok terminal performance, but not fantastic. They have poor barrier penetration. Their best use is maximizing range in the open.

                If you can find it, XM556FBIT3 is a good all round defensive load.

              • #108657
                wheelsee
                Participant

                  I’m experimenting with 75 gr BTHP. I use 20-round mags to distinguish the different loads.

                • #108658
                  Civilianresponder
                  Participant

                    Thanks for all the info. I’ll get some more 62gr. Sounds like that will be everything I need.

                  • #108659
                    libertycalls
                    Participant

                      The 77g doesn’t give much gain, while it wears out a barrel quicker. The 62g performs well out to 450 yards, better than 55g XM193’s. I’ve experienced this first hand. There’s also more wear on the barrel with a heavier projectile.

                      The 62’s are a good compromise in price to performance, and barrel life.

                      I’m not shooting green tips, I’m shooting some bulk FMJ projectiles that I load my self. I didn’t have a 20″ barreled rifle to compare them to, but I’ve got one now. Once I load up some more rounds I’ll see if there’s any difference in the longer barrel.

                    • #108660
                      rommel
                      Participant

                        Here is a worth while article found on The Captains Journal

                        AR-15 Ammunition And Barrel Twist Rate

                      • #108661
                        hellokitty
                        Participant

                          Every 5.56/.223 Ammo has its positives and negatives. There is no perfect round. You just use the best you can afford. Don’t forget ALL of them will make a hole in a person. So don’t over think it.

                          HEAT 1(CTT) X 3
                          HEAT 2 (CP) X1
                          FOF X3
                          OPFOR X2
                          CLC X2
                          RIFLEMAN

                        • #108662
                          QuietOldMan
                          Participant

                            I shoot Federal XM193 55grain. Works well with my BCM Recce 16.

                          • #108663
                            Keeper
                            Participant

                              The 77g doesn’t give much gain, while it wears out a barrel quicker.

                              pleased explain and show how it wears out a barrel. is it true for .30 also

                            • #108664
                              HitsCount
                              Participant

                                I use MK262 for SBRs and SPR/DMRs (long range). The lower fragmentation velocity improves performance at longer ranges and out of shorter barrels. The improved accuracy is nice with SPRs/DMRs.

                                Everything else eats 55 grain M193 clones except for the competition service rifle which gets match grade 223.

                                Each of the MK262 rifles has a DOPE card with the adjustment needed to bring the zero back for M193. The M193 rifles have a DOPE card with the adjustment needed to go to MK262.

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