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Rifles, Reloading, Optics, Equipment
Reloading
Need technical input: rifle project based on 7LRM cartridge necked to .277
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<blockquote data-quote="codyadams" data-source="post: 2023806" data-attributes="member: 87243"><p>The hornady being crap thing is more about their brass, their dies work fine. If you can't get under half MOA loading ammo with their dies, the problem isn't the dies. </p><p></p><p>As far as the lope vs run thing, you are correct on the Sherman cartridge, 3000+ with the 170 is running just under pressure signs in most guns, we are actually running 2940 in ours using H1000 and a 24" barrel, but that also tends to be where guns often shoot well in my experience, though there is usually another accurate node 100fps or so lower. So in that case, if you wanted to run at a lower node, you would want something capable of 3100 or maybe more with the 170. Not completely sure if the LRM will do that for you or not, it might, I haven't looked at it's performance in a while, you would definitely want to run the adg brass in that case. </p><p></p><p>The long neck thing at this point is a theory rather than fact, it may be or it may not be, I have yet to see an actual scientific test conducted to prove either way, but a lot of knowledgeable people have gone both ways on it. That being said, another option that would be pretty neat and certainly get you where you want to be velocity wise, and also have oodles of brass, would be a necked down 300 win mag. This has already been done for a 7mm in a couple of ways, the 7 practical and the 7 BC warrior are two that I know of. Again, just a bushing and you would have a .270 practical or .270 bc warrior. Just some ideas to think on, again I'm not saying to drop your project at all, I think it's doable, and I thought about a 6.5 LRM as well for a laser beam pronghorn rifle. I'm just throwing out some ideas.</p></blockquote><p></p>
[QUOTE="codyadams, post: 2023806, member: 87243"] The hornady being crap thing is more about their brass, their dies work fine. If you can't get under half MOA loading ammo with their dies, the problem isn't the dies. As far as the lope vs run thing, you are correct on the Sherman cartridge, 3000+ with the 170 is running just under pressure signs in most guns, we are actually running 2940 in ours using H1000 and a 24" barrel, but that also tends to be where guns often shoot well in my experience, though there is usually another accurate node 100fps or so lower. So in that case, if you wanted to run at a lower node, you would want something capable of 3100 or maybe more with the 170. Not completely sure if the LRM will do that for you or not, it might, I haven't looked at it's performance in a while, you would definitely want to run the adg brass in that case. The long neck thing at this point is a theory rather than fact, it may be or it may not be, I have yet to see an actual scientific test conducted to prove either way, but a lot of knowledgeable people have gone both ways on it. That being said, another option that would be pretty neat and certainly get you where you want to be velocity wise, and also have oodles of brass, would be a necked down 300 win mag. This has already been done for a 7mm in a couple of ways, the 7 practical and the 7 BC warrior are two that I know of. Again, just a bushing and you would have a .270 practical or .270 bc warrior. Just some ideas to think on, again I'm not saying to drop your project at all, I think it's doable, and I thought about a 6.5 LRM as well for a laser beam pronghorn rifle. I'm just throwing out some ideas. [/QUOTE]
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Need technical input: rifle project based on 7LRM cartridge necked to .277
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