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Rifles, Reloading, Optics, Equipment
AR15/10 Rifles
.223/5.56 barrel
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<blockquote data-quote="budlight" data-source="post: 2674987" data-attributes="member: 2939"><p>Really it comes down to what intended bullet weight. IMO the 223 case and magazine is limited to about 75 grain pills. All of my AR15's are 8 and 9 twist and my varminting ones are 20 and 24 inch barrels using Rifle length gas ports with smaller port diameters to limit gas pressure losses. I did a post here on gas port diameters and another one on the measured pressure at Carbine , mid, and Rifle length gas ports.</p><p></p><p>barrel length is lots of velocity difference. 16 inch are carbine length gas tube. So the first problem is that the pressure is higher in the barrel and it bleeds off limiting the bullet speed. the higher pressure pulse also beats the crud out of the buffer weight....</p><p></p><p>In chrono testing my friends 16 inch against my 20 inch was 300 fps loss using 62 gr HPBT. CFE 223 powder 20 inch was 3106 fps and the 16 inch was actually 2762 Average.</p><p></p><p>So I would not own a 16 inch. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite3" alt=":(" title="Frown :(" loading="lazy" data-shortname=":(" /></p><p></p><p>I used to be able to buy 1000's of 62 gr HPBT's for cheap fun varminting. also in 55 grain using HP or even soft points was much better than heavy or non expanding bullets. 16 inch 75 grain are horribly slow and pretty worthless</p></blockquote><p></p>
[QUOTE="budlight, post: 2674987, member: 2939"] Really it comes down to what intended bullet weight. IMO the 223 case and magazine is limited to about 75 grain pills. All of my AR15's are 8 and 9 twist and my varminting ones are 20 and 24 inch barrels using Rifle length gas ports with smaller port diameters to limit gas pressure losses. I did a post here on gas port diameters and another one on the measured pressure at Carbine , mid, and Rifle length gas ports. barrel length is lots of velocity difference. 16 inch are carbine length gas tube. So the first problem is that the pressure is higher in the barrel and it bleeds off limiting the bullet speed. the higher pressure pulse also beats the crud out of the buffer weight.... In chrono testing my friends 16 inch against my 20 inch was 300 fps loss using 62 gr HPBT. CFE 223 powder 20 inch was 3106 fps and the 16 inch was actually 2762 Average. So I would not own a 16 inch. :( I used to be able to buy 1000's of 62 gr HPBT's for cheap fun varminting. also in 55 grain using HP or even soft points was much better than heavy or non expanding bullets. 16 inch 75 grain are horribly slow and pretty worthless [/QUOTE]
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Rifles, Reloading, Optics, Equipment
AR15/10 Rifles
.223/5.56 barrel
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