Happy..

Discussion in 'Ammunition and Reloading' started by Nesereth, Apr 23, 2016.

  1. Nesereth New Member

    Member Since:
    Mar 29, 2016
    Message Count:
    16
    Today for the first time I reloaded some 308's and test them. Although I've been reloading 223, 9mm, and 45ACP, few others for a while I was nicely shocked when I looked down at my chrono after I took the shots. The velocity was slightly lower then I want in the end but I started with real low powder charge (as always) to see where I was at (from book numbers) and where to go from here. I was using standard CCI large Primer (in fact it was in the old diamond logo CCI's). In the end I used AR-Comp powder, got an average of 2559 velocity with a standard deviation of 2.4. I didn't neck turn or do anything special just cleaned it and ran it through the dies on the rock chucker. I hope this SD keeps up. The best SD I get with 223's is about the the 6 range so ya extremely happy to see a 2.4 with 308. Thought I'd randomly blurt my happiness out..

    thanks for reading my happy ramblings.
    Barry Hedrick likes this.
  2. spamassassin Well-Known Member

    Member Since:
    Aug 8, 2014
    Message Count:
    1,129
    Good stuff! My coach and I have been getting SD's like that with IMR 4166 in his 6.5 swede. It's only going to stay that low for a short time in all likelihood.

    How are they grouping? The stuff we were getting 2fps SD's from wasn't printing the groups we wanted. Just wasn't in the node. Bumping it up to where they group well produced SD's closer to 15fps. Sigh. Never seem to get everything.
  3. Nesereth New Member

    Member Since:
    Mar 29, 2016
    Message Count:
    16
    was getting groups around 1.4" sooo nothing to write home about but this was with a purely stock Rem 700 SPS varmint, harris bipod with a PA scope (was shooting off a picnic table at a coworkers house in twords the woods). I was just shocked since I never seen a SD that low but ya next time will be to get group sizes down so still largely playing around but *shrug* not every thing is perfect. I'll take it one thing at a time. Haven't had much time with with it yet but enjoying it which is the important part.
  4. spamassassin Well-Known Member

    Member Since:
    Aug 8, 2014
    Message Count:
    1,129
    how many shots went over the chrony for that SD? If you're into reading about math standard deviation is an interesting subject. With say only 3 shots, it's technically calculable but holds little meaning. The more shots that go into that number the less error goes into it. Running a chronograph in the first place is a great way to gather data that can be really useful for the handloader. If you're seeing SD's that low even on 3 rounds of a batch of 20 or 50 that's still pretty cool and shows some good consistency. Hopefully it's not just random and actually reflects the care you take. If it does, you're off to a promising start.
  5. Nesereth New Member

    Member Since:
    Mar 29, 2016
    Message Count:
    16
    I did a string of 10. Which is what I normally do for strings of test rounds. I do take great care to clean them but I also tend to (during sizing) run them up then turn them (the brass) and run them up a second time.
  6. spamassassin Well-Known Member

    Member Since:
    Aug 8, 2014
    Message Count:
    1,129
    that's really impressive. 2fps over 10 rounds is not insignificant
  7. Nesereth New Member

    Member Since:
    Mar 29, 2016
    Message Count:
    16
    well I made some more up we'll see what happens with the second set when I can finally get to the range.. I don't think the wife will let me do it two weekends in a row but we'll see.
  8. Nesereth New Member

    Member Since:
    Mar 29, 2016
    Message Count:
    16
    Alright so I got out again this time with higher SD.. but it printed a whole lot better.
    This time I used my own Chrono so I got the full data! Last time I used dads chrono so couldn't post it just had to go by memory.

    its funny you said around 15 because...

    avg: 2616 sd:14.5
    ES: 43

    Shot #: Speed:
    1 2621
    2 2619
    3 2600
    4 2614
    5 2638
    6 2607
    7 2629
    8 2595
    9 2609
    10 2636
  9. Keith Moderator

    Member Since:
    Dec 7, 2014
    Message Count:
    1,197
    What was your grouping? Did it improve or stay about the same? Your post reads like it was better.
  10. Nesereth New Member

    Member Since:
    Mar 29, 2016
    Message Count:
    16
    It better was 0.963" at 100 yards.
  11. Keith Moderator

    Member Since:
    Dec 7, 2014
    Message Count:
    1,197
    Interesting. A half inch improvement even though the SD seems to have widened. It would appear that SD has some bearing on the results but is not the end all be all in accuracy.


    Sent from my iPhone using Tapatalk

Share This Page