Results 1 to 11 of 11

Thread: 107 Sierra MK .243 in a Shilen 1:8 26" barrel need load help

  1. #1
    Basic Member
    Join Date
    Nov 2009
    Location
    Iowa
    Age
    54
    Posts
    1,337

    107 Sierra MK .243 in a Shilen 1:8 26" barrel need load help


    Just to ge a baseline I loaded 39, 40 and 41grns of H4831sc set just into the lands.

    39grns did about 1" @225

    40 and 41 shot about .75 @ 225 with the best group of the day being .633.

    41grns of H4831(sc) is the max shown in all of my tables, has anyone used hotter loads with better success?

    Going to work with seating depths and see if that helps.

    I know IMR4350 and others are popular powders, would prefer to stick with H4831sc for now.

  2. #2
    Basic Member
    Join Date
    Dec 2009
    Posts
    29

    Re: 107 Sierra MK in a Shilen 1:8 26" barrel need load help

    What caliber are you shooting?

  3. #3
    Basic Member
    Join Date
    Nov 2009
    Location
    Iowa
    Age
    54
    Posts
    1,337

    Re: 107 Sierra MK in a Shilen 1:8 26" barrel need load help

    Sorry .243 win.

  4. #4
    Basic Member
    Join Date
    Dec 2009
    Posts
    29

    Re: 107 Sierra MK .243 in a Shilen 1:8 26" barrel need load help

    Do you use a crono? Can you tell pressure signs. What I usually do is work up loads in small incriments like .3 untill I have some pressure signs then you know where your max is because every rifle is different. I can tell you one thing that in my rifle I have gone over book max with no pressure signs. Another powder to try would be varget.

  5. #5
    Basic Member
    Join Date
    Nov 2009
    Location
    Iowa
    Age
    54
    Posts
    1,337

    Re: 107 Sierra MK .243 in a Shilen 1:8 26" barrel need load help

    No pressure signs and no, don't have a chrono yet.

    One thing that I noticed about the Match Kings is that I had to seat them much farther out to reach the lands, going to back off a little and see if that helps.

  6. #6
    Elkbane
    Guest

    Re: 107 Sierra MK .243 in a Shilen 1:8 26" barrel need load help

    Mattri,
    Maybe it's just me, but I've yet to have MK's shoot better jammed than jumped, but I've only tried them in two different calibers - 7mm (130 and 150gr) and 6.5mm (142's). Never tried them in 6mm. You may want to try to jump the 10-15-20 thousands and see how they shoot. Glad H4831sc is working for you, it's been pretty consistent for me.
    Elkbane

  7. #7
    Joe O
    Guest

    Re: 107 Sierra MK .243 in a Shilen 1:8 26" barrel need load help

    I would change seating depth,but first sort the bullets with a comparator.It surprised me to find Sie Match kings,as much as .010 difference frome base to ogive,between bullets in the same box.I don't sort by weight,but I would,if I was having trouble getting a custom barrel to shoot,having tried everything else.Try Nosler bullets.

  8. #8
    Elkbane
    Guest

    Re: 107 Sierra MK .243 in a Shilen 1:8 26" barrel need load help

    Joe, I agree with you - just didn't want to start an "SMK's no good" rant by calling them out. The most consistent bullets I've measured and weighed are Lapua Scenars and Bergers. Hornady AMAX's are pretty decent, especially for the price. The worst are amost always SMK's, although I di have one really decent lot of 7mm SMK 130's . I think that may be why they shoot better jumped for me????? And even then, they shot good enough to tease me into thinking I could fiddle with the load and make them outstanding (but I never could). They were good, but not great.
    ELkbane

  9. #9
    Basic Member
    Join Date
    Nov 2009
    Location
    Iowa
    Age
    54
    Posts
    1,337

    Re: 107 Sierra MK .243 in a Shilen 1:8 26" barrel need load help

    Great replies, thanks. I didn't know that the MKs had a rep for being that off.

    I wanted to try the 105 A-Max but couldn't find any.

  10. #10
    Senderofan
    Guest

    Re: 107 Sierra MK .243 in a Shilen 1:8 26" barrel need load help

    I would second the seating depth deal. I also found that SMK's liked to jump a little...in my .25-06. For that rifle...I found Nosler ballistic tips to have irregular shapes...and thus I couldn't dial in my load. The SMK's were pretty darn close.

    Good Luck...Kepp us posted on your progress.

    Wayne

    P.S.
    You really need to invest in a chronograph....really helps you see when your load is dialed in.

  11. #11
    Joe O
    Guest

    Re: 107 Sierra MK .243 in a Shilen 1:8 26" barrel need load help

    Quote Originally Posted by mattri
    Great replies, thanks. I didn't know that the MKs had a rep for being that off.

    I wanted to try the 105 A-Max but couldn't find any.
    DON'T KNOW ABOUT REPUTATION,BUT WHEN MY FRIEND, WHO SHOOTS INFORMAL LONG RANGE COMPETITION, AT THE CLUB LEVEL,QUESTIONED A SIERRA TECH, ABOUT WHY THEY BOTHERED TO CALL THEM ,"MATCH",THEY TOLD HIM,"WELL ALL THE GUYS SORT THEM".HE TOLD THEM TO CALL THEM PLINKERS.THAT'S WHEN I GOT HOME AND RAN MY 95GR mk THROUGH MY COMPARATOR.THE FIRST TWO BULLETS OUT OF THE BOX WERE .009 DIFFERENCE.IIONLY GOT 35 OUT OF 78 THAT WERE WITHIN .002 IN THE MID RANGE.THEY DID PRODUCE .221 OUT OF MY HART BARRELED REMY243AI CUSTOM,BEFORE I MESSED UP THE CHAMBER(DON'T ASK).I GET THE GUN BACK TUESDAY ,WITH A NEW BARREL.A CHRONY ALPHA MASTER,WITHOUT PRINTER,BUT WITH REMOTE,HAS SERVED ME WELL FOR OVER 10 YEARS.THEY ARE NOT MUCH OVER $100.

Similar Threads

  1. "New" Shilen Barrel With Copper Fouling
    By garyatllp in forum 110-Series Rifles
    Replies: 5
    Last Post: 07-16-2015, 12:45 PM
  2. Replies: 20
    Last Post: 09-08-2014, 09:17 PM
  3. 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
  4. 308 load data, 28" 1-12"twist Broughton barrel
    By Dennis in forum Ammunition & Reloading
    Replies: 10
    Last Post: 01-27-2010, 12:14 AM

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
  •