Results 1 to 6 of 6

Thread: .223 77gr. SMK issue

  1. #1
    Basic Member
    Join Date
    Apr 2023
    Posts
    58

    .223 77gr. SMK issue


    I loaded them at 2.400 oal just under the mag size by about .020. Problem is the feed ramp. The longer bullet starts upward motion to soon. Has anyone modified the gun ramp or mag to correct this?

  2. #2
    Basic Member
    Join Date
    Jun 2018
    Location
    las cruces, nm
    Posts
    2,727
    I am surprised those fit in a magazine or even in the chamber. Mine were 2.280 and they barely fit. When I had 1000rnds through the barrel there was only 0.020" jump to the lands.

  3. #3
    Basic Member
    Join Date
    Apr 2019
    Posts
    448
    The 69 grain Sierras for my Axis measure 2.48" I would say there is maybe .008"-.010" or so from touching part of the magazine. They seem to feed OK, surprisingly.

  4. #4
    Banned
    Join Date
    Jan 2016
    Location
    Suburb of Filthadelphia.
    Age
    45
    Posts
    5,704
    Quote Originally Posted by charlie b View Post
    I am surprised those fit in a magazine or even in the chamber. Mine were 2.280 and they barely fit. When I had 1000rnds through the barrel there was only 0.020" jump to the lands.
    2.280” is still fairly short for a 223 in a Bolt Gun. I load my 223 for my AR’s @ 2.250” which is max AR15 mag length. And I can still load up to 75gr BTHP’s at that length. Now, I don’t shoot any 223 in a Bolt Gun but I’m always reading here & other places of guys loading 2.300”-2.400”+ for their bolt actions.

  5. #5
    Basic Member
    Join Date
    Apr 2023
    Posts
    58
    The gun shot fine. I would have shot the bullet in the lands to start, but it wouldn't fit the magazine. I didn't write down cbto due to not fitting. I will now that they fit the mag. The wind was blowing 10 to 15 mph left to right. I shot a 1.180 five shot group. And one .875 3 shot group. 24.8 gr BL-2C powder @ 2733 fps. Hodgens says 2806 but I have never got the speed they say on any load.

  6. #6
    Basic Member
    Join Date
    Jun 2018
    Location
    las cruces, nm
    Posts
    2,727
    At the 1000rnd point at 2.3" the smks were touching the lands on my Axis barrel. They had less than 0.1" clearance in the Savage mag (it is the one with the block in it, not AICS). When I loaded 75 ELD match bullets to the same CBTO they were too long for the mag at 2.44" (but they shot very well).

Similar Threads

  1. 5 shot group 77gr SMK 1-9 twist
    By The Coach in forum Member Builds & Range Reports
    Replies: 18
    Last Post: 10-13-2016, 11:07 PM
  2. Anyone shooting 77gr out of their .223 12 F/TRs?
    By Roger the Shrubber in forum Ammunition & Reloading
    Replies: 6
    Last Post: 03-26-2012, 12:50 PM
  3. 77gr
    By shovelheadave in forum Ammunition & Reloading
    Replies: 9
    Last Post: 12-05-2010, 10:37 AM
  4. 77gr smk
    By ICUDIEN in forum Ammunition & Reloading
    Replies: 4
    Last Post: 10-05-2010, 12:14 AM
  5. Sierra 77gr
    By possum1 in forum Ammunition & Reloading
    Replies: 9
    Last Post: 02-20-2010, 08:22 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •