Results 1 to 15 of 15

Thread: sierra 77 gr in 223 with 7 twist

  1. #1
    Team Savage
    Join Date
    Jan 2015
    Posts
    228

    sierra 77 gr in 223 with 7 twist


    I'm trying to develop a load for 300 to 500 yard target shooting
    using the 77 grain sierra's.So far the best I can get with any
    powder is about 1.5 inch at 300 yds. How far are you guys letting
    the bullet jump? I was trying .010 today..Powders used were
    748,rx15,imr 4166,cfe 223 and H4895..Winchester brass and
    cci 400 primers in a bolt actin from a rest on the bench.Thanjs for
    any advice you have to offer..

  2. #2
    Basic Member Robinhood's Avatar
    Join Date
    Apr 2014
    Location
    South Texas
    Age
    66
    Posts
    7,784
    Sierras accuracy load is RE-15 24.1 grs. @2750 fps/1293 ft.lbs.
    They used Rem 7 1/2 primers. I drop a few tenths of a grain with CCI.

    What powder scale?

    Make and condition of brass?
    The Dunning-Kruger effect is alive and well.

  3. #3
    Basic Member
    Join Date
    Feb 2016
    Posts
    60
    Need to weigh brass and billets along with proper prep work to brass to get small groups at that range.

  4. #4
    New Member
    Join Date
    Feb 2016
    Age
    69
    Posts
    622
    Quote Originally Posted by noname View Post
    I'm trying to develop a load for 300 to 500 yard target shooting
    using the 77 grain sierra's.So far the best I can get with any
    powder is about 1.5 inch at 300 yds. How far are you guys letting
    the bullet jump? I was trying .010 today..Powders used were
    748,rx15,imr 4166,cfe 223 and H4895..Winchester brass and
    cci 400 primers in a bolt actin from a rest on the bench.Thanjs for
    any advice you have to offer..
    1 1/2" group at 300 yrds? That is a half MOA group. Pretty good. For every tenth smaller it will take a lot of work with reloading techniques and components. That is if you have a rifle that is capable.

    What rifle?

  5. #5
    Team Savage
    Join Date
    Jan 2015
    Posts
    228
    Quote Originally Posted by bc83 View Post
    Need to weigh brass and billets along with proper prep work to brass to get small groups at that range.
    What the procedure for weighing brass? I would think after sizeing and trimming..And what weight difference does it have to be in..I do weight the bullets..All brass has the pockets reamed and flash holes debured..

  6. #6
    Team Savage
    Join Date
    Jan 2015
    Posts
    228
    Quote Originally Posted by m12lrs View Post
    1 1/2" group at 300 yrds? That is a half MOA group. Pretty good. For every tenth smaller it will take a lot of work with reloading techniques and components. That is if you have a rifle that is capable.

    What rifle?
    Savage mod 10 with McGowing bull barrel..So far 456 rounds is all

  7. #7
    Team Savage
    Join Date
    Jan 2015
    Posts
    228
    Quote Originally Posted by Robinhood View Post
    Sierras accuracy load is RE-15 24.1 grs. @2750 fps/1293 ft.lbs.
    They used Rem 7 1/2 primers. I drop a few tenths of a grain with CCI.

    What powder scale?

    Make and condition of brass?
    Either RCBS electric or Redding balance beam and they both weigh to same each time.Brass is Winchester,Once fired..

  8. #8
    Basic Member
    Join Date
    Jul 2007
    Posts
    187
    Heck with the OCD weighing everything to a gnats pimple with no statistical proof. Try something simple that works-

    Switch primers. Try 7 1/2's, 450's, 205M's. One of them will show an advantage.

  9. #9
    Team Savage
    Join Date
    Jan 2015
    Posts
    228
    Quote Originally Posted by Scott Evans View Post
    Heck with the OCD weighing everything to a gnats pimple with no statistical proof. Try something simple that works-

    Switch primers. Try 7 1/2's, 450's, 205M's. One of them will show an advantage.
    never thought about that..will see what I can find around here in whoville

  10. #10
    Basic Member
    Join Date
    Jul 2007
    Posts
    187
    Primers are as much a variant as powder type, charge weight, and seating depth. Once you've found a pretty decent consistent load that doesn't shotgun, just switching primers can tighten it up considerably. Or turn it into a shotgun.

  11. #11
    Basic Member
    Join Date
    Feb 2013
    Age
    54
    Posts
    344
    I would go with cci 450

  12. #12
    Team Savage
    Join Date
    Jan 2013
    Posts
    319
    I believe the 77 smk was developed for mag use and i've found they like to jump. I load mine a 2.245". LC brass 09 and up, 23.2-24gr of 8208xbr is a common proven load lit with a cci 450 or rem 7 1/2. I personally use wolf srm's but they can't be found anymore to my knowledge. i'd love to find more. I do a light crimp with a lee fcd but I only use these in my gas guns currently.

    I also sub the smk for the nosler CC and generally buy the "cosmetic blemished" from shooter pro as I feel they shoot just as well for a fraction of the cost.

    being that you have a bolt gun i'd also reccomend you try the hornady eld-m offerings or if you can buy a stockpile of the 75 or 80 amax's they are also a great bullet. the BC is leaps and bounds above the dated 77 smk

  13. #13
    Basic Member
    Join Date
    Feb 2008
    Location
    south arkansas
    Age
    65
    Posts
    1,292
    Tula primers are the same as the wolf
    "And you shall know the truth, and the truth shall make you free.” John 8:32 (New King James Version)

  14. #14
    Team Savage
    Join Date
    Jan 2013
    Posts
    319
    Quote Originally Posted by earl39 View Post
    Tula primers are the same as the wolf
    interesting but haven't those become unobtanium as well?

  15. #15
    Basic Member
    Join Date
    Feb 2008
    Location
    south arkansas
    Age
    65
    Posts
    1,292
    They are still out there
    "And you shall know the truth, and the truth shall make you free.” John 8:32 (New King James Version)

Similar Threads

  1. G7 BC for the 6.5mm 130 gr Sierra TMK
    By copterdrvr in forum Ammunition & Reloading
    Replies: 2
    Last Post: 06-01-2018, 06:54 AM
  2. Replies: 1
    Last Post: 07-11-2014, 08:19 AM
  3. Sierra 55 gr
    By blooper in forum Predator and Varmint Hunting
    Replies: 10
    Last Post: 06-28-2014, 08:32 AM
  4. 107 gr Sierra MOLY Matchking - 28" 1-8 twist .243 competition barrel
    By IA_shooter in forum Ammunition & Reloading
    Replies: 4
    Last Post: 03-02-2013, 08:41 AM
  5. 10FP .308 1:10" LH twist or RH twist?
    By Galveston22 in forum 110-Series Rifles
    Replies: 2
    Last Post: 07-12-2010, 11:06 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
  •