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The Range
Ammo & Reloading
16" 5.56 1:7 twist with 40 gr bullets
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<blockquote data-quote="swampratt" data-source="post: 3469225" data-attributes="member: 15054"><p>When I was doing load development for my 22" barrel .223 with 1:9 twist I shot H4895 powder as it was most accurate for all bullets I had used.</p><p></p><p>I tried 75gr 69 gr 60 gr and 55 gr.</p><p>I shot them all with the best accuracy load in the upper accuracy node range.</p><p></p><p>The heavy bullets were way down at 300 yards vs the 55gr and the 55 gr had even less drop than the 60 gr V-max.</p><p></p><p>I stuck with the 55gr V-max as the velocity allowed less drop and less wind drift.</p><p>Maybe H4895 was not a fast enough powder.. OR a powder that did not have enough velocity in that case.</p><p></p><p>I did get some velocity readings in my 16" ar with the 55gr V-max load and H4895.</p><p>2789 FPS in my 1:7 twist 5.56.</p><p></p><p>Now today I shot the 40 gr. Nosler with 25.3gr N133 and got 3204 and 3194 FPS for 2 shots recorded.</p><p>Chrono' was 15 feet from the Muzzle.</p><p></p><p>Next up was 24.7 gr. N133 55 Nosler flat base.</p><p>3024 and 3010 FPS for 2 shots fired.</p><p></p><p>I did not shoot for groups with the AR today.</p><p></p><p>I will only use the 40 gr on tree rats or other vermin.</p><p>55 gr. V-max or the 55 Nosler will be for the Deer.</p><p></p><p>My testing on heavier bullets consisted of a 5+ foot tall cardboard box that a refrigerator came in.</p><p>I set it up with an X 6" below the top of the box.</p><p>At 100 yards I shot at the X.</p><p>Then moved to 200 then 300.</p><p>I shot all the different weight bullets at that X and that was an eye opener.</p><p>Heavy bullets actually drifted much more than the V-max 55gr.</p><p>Not to mention the drop with the heavies was much greater.</p><p>I got rid of almost all of the heavier ones after that testing.</p><p></p><p>Yes you can work it up on a trajectory calculator with bullet BC and velocity.</p><p>But in my eyes nothing beats real shooting for your testing.</p><p></p><p>Today I am pretty happy with the velocity increase with N133.</p><p>Just need to test hot and cold weather shooting with it and see if the group stays tight. Once I find a good load.</p></blockquote><p></p>
[QUOTE="swampratt, post: 3469225, member: 15054"] When I was doing load development for my 22" barrel .223 with 1:9 twist I shot H4895 powder as it was most accurate for all bullets I had used. I tried 75gr 69 gr 60 gr and 55 gr. I shot them all with the best accuracy load in the upper accuracy node range. The heavy bullets were way down at 300 yards vs the 55gr and the 55 gr had even less drop than the 60 gr V-max. I stuck with the 55gr V-max as the velocity allowed less drop and less wind drift. Maybe H4895 was not a fast enough powder.. OR a powder that did not have enough velocity in that case. I did get some velocity readings in my 16" ar with the 55gr V-max load and H4895. 2789 FPS in my 1:7 twist 5.56. Now today I shot the 40 gr. Nosler with 25.3gr N133 and got 3204 and 3194 FPS for 2 shots recorded. Chrono' was 15 feet from the Muzzle. Next up was 24.7 gr. N133 55 Nosler flat base. 3024 and 3010 FPS for 2 shots fired. I did not shoot for groups with the AR today. I will only use the 40 gr on tree rats or other vermin. 55 gr. V-max or the 55 Nosler will be for the Deer. My testing on heavier bullets consisted of a 5+ foot tall cardboard box that a refrigerator came in. I set it up with an X 6" below the top of the box. At 100 yards I shot at the X. Then moved to 200 then 300. I shot all the different weight bullets at that X and that was an eye opener. Heavy bullets actually drifted much more than the V-max 55gr. Not to mention the drop with the heavies was much greater. I got rid of almost all of the heavier ones after that testing. Yes you can work it up on a trajectory calculator with bullet BC and velocity. But in my eyes nothing beats real shooting for your testing. Today I am pretty happy with the velocity increase with N133. Just need to test hot and cold weather shooting with it and see if the group stays tight. Once I find a good load. [/QUOTE]
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