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Rifles, Reloading, Optics, Equipment
AR15/10 Rifles
6mm Creedmoor gas gun
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<blockquote data-quote="ARlife4me" data-source="post: 2865117" data-attributes="member: 105694"><p>The AP barrels I have don't destroy brass in 6.5creed with a rifle length system.</p><p>port sizes per barrel lengths from AP site</p><p>20"/.0760"</p><p>22"/.0730"</p><p>24"/.0700"</p><p>All 3 barrels have non-adjustable blocks, standard weight buffers and springs. None pop primers or have any other issues. I wish I could say that for the +2 gas barrels using standard weight recoil parts even with and adjustable block. 5.56's are a no brainer along with 308win's on gas systems, but other cartridges don't play the same game on pressures per length. Take 3 creedmoors of different calibers as the case is the same length. Start by using the same powder (probably won't be able to use the same amount) and pressures will not be the same at each per inch. Yes, powder volume and type changes the way it'll act also as you know. Regardless of 65k at or within 2-3 inches of throat will have a drastic difference between even 260rem and 6.5creed as max pressure between the 2 are different. I speak this as my experience with these cartridges and with the same barrel company (Proof) with 260rem and 6.5creed. As you stated about gas in the barrel is no doubt true as is why bolt actions give higher velocities than AR's with the same barrel lengths for comparison. Another reason most factory ammo doesn't function well between the 2 in AR's as it's built for bolt guns.</p></blockquote><p></p>
[QUOTE="ARlife4me, post: 2865117, member: 105694"] The AP barrels I have don't destroy brass in 6.5creed with a rifle length system. port sizes per barrel lengths from AP site 20"/.0760" 22"/.0730" 24"/.0700" All 3 barrels have non-adjustable blocks, standard weight buffers and springs. None pop primers or have any other issues. I wish I could say that for the +2 gas barrels using standard weight recoil parts even with and adjustable block. 5.56's are a no brainer along with 308win's on gas systems, but other cartridges don't play the same game on pressures per length. Take 3 creedmoors of different calibers as the case is the same length. Start by using the same powder (probably won't be able to use the same amount) and pressures will not be the same at each per inch. Yes, powder volume and type changes the way it'll act also as you know. Regardless of 65k at or within 2-3 inches of throat will have a drastic difference between even 260rem and 6.5creed as max pressure between the 2 are different. I speak this as my experience with these cartridges and with the same barrel company (Proof) with 260rem and 6.5creed. As you stated about gas in the barrel is no doubt true as is why bolt actions give higher velocities than AR's with the same barrel lengths for comparison. Another reason most factory ammo doesn't function well between the 2 in AR's as it's built for bolt guns. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
AR15/10 Rifles
6mm Creedmoor gas gun
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