Jump to content
Sturgeon's House

Search the Community

Showing results for tags 'caliber'.

  • Search By Tags

    Type tags separated by commas.
  • Search By Author

Content Type


Forums

  • The Outer Rim
    • Open Discussion
    • Aviation
    • Elon Musk: Making Space Great Again
    • Naval Discussion
    • Mechanized Warfare
    • Ballistics Science Discussion
    • Infantry Tools & Tactics
    • Dr. Strangelove's Nuclear Palace
    • Biosciences
    • History, Culture, and Archaeology
    • Fiction & Entertainment
    • Computers, Software, and Tech Support
    • Historical Warfare
    • Sturgeon's Contests

Blogs

  • Of IS-7s and Other Things
  • Archive Awareness
  • Unstart's Blog
  • The Sherman Blog
  • U-47

Find results in...

Find results that contain...


Date Created

  • Start

    End


Last Updated

  • Start

    End


Filter by number of...

Joined

  • Start

    End


Group


AIM


MSN


Website URL


ICQ


Yahoo


Jabber


Skype


Location


Interests

Found 2 results

  1. So my mind wandered off the other day and I started thinking about bolt carriers, recoil springs and caliber conversions. I feel kind of ignorant for not getting this completely straight, but I'm wondering if I'm missing something. Let's say you'd have an AR-style rifle chambered in .308, and you'd convert it to .223 with a swap of the bolt head and the upper receiver. Let's ignore the magazine issue for this discussion. I'd imagine that the optimal bolt carrier velocity is the same regardless of cartridge (within some reasonable limit). Thus it should be perfectly possible to compensate for the new cartridge only by changing the gas port location or size, and leaving the same bolt carrier mass, the same bolt head mass, the same recoil spring and buffer in there. For some reason I've always had it in my head that a larger cartridge requires a heavier bolt carrier, but I just realized that that's not right. A larger cartridge requires more space on the bolt face, more space in the receiver, and a sturdier lockup. This tends to lead to a heavier bolt carrier group, but there is no need for a heavier bolt carrier per se. Is my understanding correct? Of course there is less volume to work with when running a gas system on a .223 versus having a larger cartridge, but it should be perfectly possible to fiddle with the gas port size and location to compensate. I could also imagine the larger surface area of the larger cartridges to increase friction during primary extraction, but the difference between different calibers should be negligible compared to the difference between dirty ammo and slightly oily ammo. The Saiga rifles use the same bolt carrier and virtually the same bolt for all of the difference cartridges. The Knights Armament SR-25 uses the same springs and buffer as the M16a2 (although they have a heavier carrier and had some issues) The DPMS genII small frame .308 rifles use the same buffers and springs as the 5.56 rifles. Bonus: Check out this thread from arfcom on bolt carrier velocity https://www.ar15.com/forums/general/for_AR_fans_and_engineering_nerds__I_calculated_the_bolt_carrier_velocity_profile_for_an_AR_10/5-1150725/
  2. Let's start this thread off with a an interview with Justin Johnson, the Federal centerfire product manager, coming from Ultimate Reloader: This interview covers the first year of the Valkyrie, and addresses things like the 90gr SMK's problems, twist rates, barrel life, etc.
×
×
  • Create New...