223 subsonic load data - Page 2


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Old 04-09-2012, 06:04 PM   #11
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3890,

You will more than likely with out a doubt have cycling problems with a sub sonic round. Also if you go heavy like 80 grain or more? If you could find (80+) them need to plan on a single round at a time. 80s are generally way to long for a magazine to feed properly. If someone has solved the problem with the 80s please share it with us.
A lot of varmint hunters our west use up to 80 grain for real long shots. However a friend of mine loads one at a time.'

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Old 04-09-2012, 06:27 PM   #12
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Quote:
Originally Posted by sniper762
YOU do know that it is not recomended to load jacketed projos in rifles to subsonic velocities (builds excessive pressures). use cast lead. i called sierra reloading tech for .308 susonic info. they said 7gr. of unique behind a cast lead 200 gr. projo for 1050fps.

also no subsonic loads will cycle semi auto actions. my reason for going with the 22 adapter.
You are right about them not cycling but, I knew that before I started. With trailboss there is no risk of overpressure. They even have a trailboss load on the IMR website of 4g with a 55g FMJ. They also have instructions for a reduced load with any cartridge. It is something like 20% less weight of trailboss than what fills the case to the bullet depth. This powder is a unique one that was developed for low pressure situations. This load is also a unique one with a very specific application, which I believe others may have a need for. That is why I shared my experiences with this load.

Next I will be working on some subsonic loads with this powder and some heavier bullets. But for now 55g FMJs are what have been tested.

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Old 04-09-2012, 07:35 PM   #13
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isn't it a bad think to load super light loads of something like Unique? I recall something about detonation? Something about the case volume and powder charge density? years ago though.

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Old 04-09-2012, 09:30 PM   #14
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the load was recomended by the sierra reloading tech so i trusted it. i fired dozens of them with no problem. i think the key is with cast bullets. they dont create much pressure

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Old 04-10-2012, 01:12 AM   #15
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Quote:
Originally Posted by Dan308
isn't it a bad think to load super light loads of something like Unique? I recall something about detonation? Something about the case volume and powder charge density? years ago though.
www.reloadammo.com/liteload.htm

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Old 04-10-2012, 03:46 AM   #16
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linux, this implies of light loads using unique with jacketed projos. cast lead projos (as i used) dont produce pressures as do jacketed ones.

think about it. you can push a .308 lead slug through a barrel with a steel rod but not a jacketed .308.

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Old 04-10-2012, 05:29 AM   #17
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Quote:
Originally Posted by linuxuser3890 View Post
www.reloadammo.com/liteload.htm

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wow that's dated 1996! New I read that somewhere. Thanks for the info sniper762
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Old 04-10-2012, 05:52 AM   #18
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Quote:
Originally Posted by sniper762
linux, this implies of light loads using unique with jacketed projos. cast lead projos (as i used) dont produce pressures as do jacketed ones.

think about it. you can push a .308 lead slug through a barrel with a steel rod but not a jacketed .308.
I don't think it has so much to do with the force it takes to push the projectile as it does the amount of powder burning with respect to time. Although if sierra gave you the data I don't see why anyone wouldn't trust it.

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Old 04-10-2012, 05:59 AM   #19
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762,
After reading that again the guy with the T/C had cast bullets and they were smaller than the bore diameter. So if you believe that story it really supports my dA/dt theory.

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Old 09-02-2012, 12:15 AM   #20
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RTBA has developed a AR upper that cycles his subsonic loads. It works great. I am also a dealer for them. I shoot a 75gr BTHP and groups well and cycles great. Even in full auto.



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