Welcome guest, is this your first visit? Create Account now to join.
  • Login:

Welcome to the NZ Hunting and Shooting Forums.

If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed.

Terminator Ammo Direct


User Tag List

+ Reply to Thread
Results 1 to 9 of 9
Like Tree2Likes
  • 1 Post By grandpamac
  • 1 Post By grandpamac

Thread: Different brass strength between batches?

  1. #1
    Member
    Join Date
    May 2020
    Location
    Northland Waipu
    Posts
    227

    Different brass strength between batches?

    Hi team,

    Bought 2x50 boxes of Hornady brass the other day for trying out 90gr eldx for my .243. Did a ladder test from 2gr under to 1 over ADI max loads, all ok to me, small crater around primer and slightly flattened, but it was doing the same from 2gr under max load. (Federal match primers and ar2209) All brass was FL resized from New. Settled on 44.5gr, as it should get me 3100fps.

    Loaded 50 to sight in and give some turkey a hard time, in this 50 there was 20 bits of brass from the next box, a different batch.

    While sighting in a round gave me a slightly stiff bolt, good extractor/ejector marks, indicating high pressure?? Trade another, fine, then pressure sign, primers all looked similar.

    The only variable is the brass? I checked the boxes and they were definitely from different batches. Is it a case that I need to find a load safe for the soft brass? Or ditch the soft brass? How us/safe is it to shoot the soft brass?

    Thanks Lars

    Name:  20200726_103654.jpg
Views: 443
Size:  2.34 MB

  2. #2
    Member
    Join Date
    Mar 2019
    Location
    Cambridge
    Posts
    285
    I personally think the primers on both cases are ok as far a flattening goes, though there is small amount of primer extrusion on the middle case. The brass could be softer in some but I would also check case capacity (and weight) of the two batches. Small variations can have reasonably significant effects if you are close to max.

  3. #3
    Gone but not forgotten
    Join Date
    Apr 2017
    Location
    Hamilton
    Posts
    4,129
    Quote Originally Posted by Larrygoat View Post
    Settled on 44.5gr, as it should get me 3100fps.
    You might find it's a fair bit faster than that, depending on barrel length.

    42.4gr of AR2209 gets me 3140fps. 90gr ELD-X, Federal 210 primer, Norma brass, 24 inch barrel.

  4. #4
    Member
    Join Date
    Dec 2019
    Location
    Okawa Hawkes Bay
    Posts
    3,070
    Greetings Larry Goat,
    Yes that one on the right is way too hot and I suspect the middle one is as well. The Hornady 90 grain ELDX is a long pointy projectile and the Hodgdon/ ADI data is worked up with the Speer 90 grain spitzer flat base and this is old CUP data not PSI. When the pressure measuring system was changed the .243 max pressure was lowered due to erratic pressures in the .243. Your ELDX projectiles are likely seated deeper due to the mag length so case capacity is less and pressure is higher. It is also possible, likely even, that your AR2209 is significantly faster than the batch used by Hodgdon to work up their loads. I found this in my 6.5 recently and Cigar above is matching book velocities with 2 grains less powder. This is exactly what I found. I don't think your cases are the problem, your loads are excessive. 42.4 grains matches the Hodgdon data for the 85 TTSX and the 95 grain Partition. A chronograph would have warned you that you were too hot. Sorry to give bad news.
    Regards Grandpamac.
    Micky Duck likes this.

  5. #5
    Member
    Join Date
    Dec 2019
    Location
    Okawa Hawkes Bay
    Posts
    3,070
    Greetings Again,
    Just checked some of my old load data. The load of 44.5 grains of AR2209 for the 90 grain Speer for 3,185 fps appears in the November 2000 ADI Guide. This is before the increase in powder speed. Cigar is spot on and you need to cut your load by 2 grains to get back to safe pressures.
    Regards Grandpamac.
    Micky Duck likes this.

  6. #6
    Member
    Join Date
    May 2020
    Location
    Northland Waipu
    Posts
    227
    Grandpamac, that load is also currently on ADI's website, so its possibly a case that the ELDX are harder to push down the barrel? Either way ill pull and reload lower, I'm not that set on blowing myself up.

    Thanks Lars

  7. #7
    Member
    Join Date
    May 2020
    Location
    Northland Waipu
    Posts
    227
    Just saw yore first post grandpamac ignore my last.

  8. #8
    Member
    Join Date
    Dec 2019
    Location
    Okawa Hawkes Bay
    Posts
    3,070
    Quote Originally Posted by Larrygoat View Post
    Grandpamac, that load is also currently on ADI's website, so its possibly a case that the ELDX are harder to push down the barrel? Either way ill pull and reload lower, I'm not that set on blowing myself up.

    Thanks Lars
    The load is also on the Hodgdons website. Hodgdons does all the testing and load development for the ADI powders. It is a bit remiss of Hodgdon in not updating the data when the powder speed has increased to that extent. I did a post a while back on my findings with different AR2209 lots and also an article on NZ guns. Others have found the same speed change. When you compare the data for the 85, 90 and 95 grain loads the 90 grain ones stick out like a shag on a rock. The 85 grain load for the TTSX was lower as expected for the hard Barnes projectile and the 95 grain load (also slower powder) was 2.5 grains less than the 90 grain load. There is an awful lot to learn about handloading and I am still learning after 50 years.
    All the best,
    Grandpamac.

 

 

Similar Threads

  1. What strength line for a seven giller shark
    By Cody.a in forum Fishing
    Replies: 2
    Last Post: 02-12-2017, 11:53 AM
  2. Replies: 36
    Last Post: 25-06-2014, 08:17 PM
  3. fitting an extra strength main spring to tikka
    By Bill999 in forum Firearms, Optics and Accessories
    Replies: 6
    Last Post: 24-10-2013, 10:06 PM

Tags for this Thread

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
Welcome to NZ Hunting and Shooting Forums! We see you're new here, or arn't logged in. Create an account, and Login for full access including our FREE BUY and SELL section Register NOW!!