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Rifles, Reloading, Optics, Equipment
Reloading
6.5 x 06 Just input
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<blockquote data-quote="nicholasjohn" data-source="post: 1647291" data-attributes="member: 109113"><p>55 grains of H-4831 sounds pretty reasonable. I would expect velocities in the 2900 to 3000 fps range with that, and I would also think that you would be very near max pressure. Much of the reloading data I've seen in manuals for this cartridge was pretty anemic, and would barely out-run 6.5 X 55 factory loads. I think they keep things pretty cool, since they don't know what kind of throats people are putting in their rifles, or what twist rates their barrels have. </p><p></p><p>This cartridge does have SAAMI specs, since it was once loaded by A-Square. Since it never became popular as a factory round, there are probably a lot more rifles out there that were set up for some wildcat version of the cartridge, hence the reticence of the bullet & powder manufacturers to list loads for it at .270 Winchester pressure levels. If you're going to load it to those levels, study up on pressure signs first. Measuring case heads has worked well for me, using a blade micrometer to measure just ahead of the extractor groove before & after firing. ( Make sure you use new brass each time.) NICK HARVEY'S PRACTICAL RELOADING MANUAL has a section on this subject that is very good. Also, an old Hodgdon manual says that cartridges that employ the 30-06-sized case head are at maximum pressure when they show .0004-.0005" expansion at this point. ( Factory loads in the 30-06 & 270 usually expand about .0003 in my rifles.) </p><p></p><p>A lot of people poo-poo this method, but Dave Scovill ( from Rifle & Handloader Magazines ) did a lot of testing with it years ago, and he found that .0005" expansion regularly coincided with 60,000 PSI on some ammunition manufacturer's pressure measuring equipment. I don't know if that's enough for you to go on, but this method definitely is a good measure of relative pressure.</p></blockquote><p></p>
[QUOTE="nicholasjohn, post: 1647291, member: 109113"] 55 grains of H-4831 sounds pretty reasonable. I would expect velocities in the 2900 to 3000 fps range with that, and I would also think that you would be very near max pressure. Much of the reloading data I've seen in manuals for this cartridge was pretty anemic, and would barely out-run 6.5 X 55 factory loads. I think they keep things pretty cool, since they don't know what kind of throats people are putting in their rifles, or what twist rates their barrels have. This cartridge does have SAAMI specs, since it was once loaded by A-Square. Since it never became popular as a factory round, there are probably a lot more rifles out there that were set up for some wildcat version of the cartridge, hence the reticence of the bullet & powder manufacturers to list loads for it at .270 Winchester pressure levels. If you're going to load it to those levels, study up on pressure signs first. Measuring case heads has worked well for me, using a blade micrometer to measure just ahead of the extractor groove before & after firing. ( Make sure you use new brass each time.) NICK HARVEY'S PRACTICAL RELOADING MANUAL has a section on this subject that is very good. Also, an old Hodgdon manual says that cartridges that employ the 30-06-sized case head are at maximum pressure when they show .0004-.0005" expansion at this point. ( Factory loads in the 30-06 & 270 usually expand about .0003 in my rifles.) A lot of people poo-poo this method, but Dave Scovill ( from Rifle & Handloader Magazines ) did a lot of testing with it years ago, and he found that .0005" expansion regularly coincided with 60,000 PSI on some ammunition manufacturer's pressure measuring equipment. I don't know if that's enough for you to go on, but this method definitely is a good measure of relative pressure. [/QUOTE]
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