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Rifles, Reloading, Optics, Equipment
AR15/10 Rifles
Rifles to avoid?
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<blockquote data-quote="brentc" data-source="post: 905569" data-attributes="member: 16938"><p>A lot of good info passed along here. It's best to build than buy complete to get what you want. </p><p> </p><p>I haven't seen a cast receiver in a long time and I think Olympic was about the last manufacturer casting receivers and they went to forged only a decade or longer ago.</p><p> </p><p>About twist rate. If you want to shoot the heavy 75 and 77 grainers it's best to get a 7 or 8 twist. In my experience with approximately 30 9 twist ARs that I've built and helped buddies build it's a crap shoot. Sometimes it will stabilize them, sometimes it won't. The common rule is that the 9 twist will stabilize the 69 and 70 grainers at a maximum. I wouldn't buy a 9 twist expecting it to stabilize 75s and 77s. There's about a 70% chance you'll be disappointed unless you're at a high elevation and driving them hard. </p><p> </p><p>General rules for twist rate:</p><p> </p><p>1 in 9 for up to 70 grains </p><p> </p><p>1 in 8 for 70 to 80</p><p> </p><p>1 in 7 for anything above 80</p><p> </p><p>And don't expect to use the 75+ amax's at mag length in an AR. The HPBTs work excellent though.</p></blockquote><p></p>
[QUOTE="brentc, post: 905569, member: 16938"] A lot of good info passed along here. It's best to build than buy complete to get what you want. I haven't seen a cast receiver in a long time and I think Olympic was about the last manufacturer casting receivers and they went to forged only a decade or longer ago. About twist rate. If you want to shoot the heavy 75 and 77 grainers it's best to get a 7 or 8 twist. In my experience with approximately 30 9 twist ARs that I've built and helped buddies build it's a crap shoot. Sometimes it will stabilize them, sometimes it won't. The common rule is that the 9 twist will stabilize the 69 and 70 grainers at a maximum. I wouldn't buy a 9 twist expecting it to stabilize 75s and 77s. There's about a 70% chance you'll be disappointed unless you're at a high elevation and driving them hard. General rules for twist rate: 1 in 9 for up to 70 grains 1 in 8 for 70 to 80 1 in 7 for anything above 80 And don't expect to use the 75+ amax's at mag length in an AR. The HPBTs work excellent though. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
AR15/10 Rifles
Rifles to avoid?
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