.300 wsm pressure signs

Discussion in 'Reloading' started by Dexter Grayson, Apr 7, 2014.

  1. Dexter Grayson

    Dexter Grayson Member

    Messages:
    19
    Joined:
    Feb 2, 2014
    I'm shooting my tikka .300 wsm with 180 gr AB's over 66 gr of RL-17 (max sammi) at 2.895 coal, in nosler brass. This load has performed great for me so far, but when I was shooting yesterday I noticed the bolt lift was a little stiffer than what I remembered. So I threw a couple of factory nosler loads down range and paid close attention to the lift, and my reloads definitely had a stiffer lift.

    I've probably shot 40-50 of this load
    I have not shot it over a chrono yet.
    The brass does not show any pressure signs.

    My question is am I just being nitpicky or do you guys think my pressures are too high?
    And if they are high what is my next step?
     
  2. Barrelnut

    Barrelnut Well-Known Member

    Messages:
    3,427
    Joined:
    Dec 16, 2013
    Was the day warmer when you noticed the bolt lift issue? They say the powder is temp sensitive, but I have not proven that for myself yet.

    I ran RL-17 up to 65 gn in my 300 WSM with 180 NBTs, but thought it a tad hot and backed off to 64 gn. Once reason for the backoff was to see how the load performed in warmer weather. It was about 50 deg when I developed it. Also, the Alliant web site list 66 gn as max for a 180 Speer bullet, but that is a SPEER bullet, not a NOSLER AB. The bullets bearing surfaces could be different and that would affect the max load.

    I would back off to 64 or 65gn and see if it relieves the issue.
     
  3. Dexter Grayson

    Dexter Grayson Member

    Messages:
    19
    Joined:
    Feb 2, 2014
    It was a touch warmer. I got the max load from nosler.

    I'll load a couple at 64-65 range and see how the lift is. Thank you for the reply.
     
  4. kcebcj

    kcebcj Well-Known Member

    Messages:
    1,215
    Joined:
    Jan 28, 2008
    That is a hot load ...66g RL17 in a 300 WSM and 180gr Accubond. Quick Load shows that load at 66,227psi with max pressure being 63,817. I would say that 64gr is pushing it with RL17. That would be a OK load with RL19 or 22.

    If Nosler gave you that load are you sure they were not thinking 300WM? I would back off to 62gr and come back up. I think if you pay close attention you will find brass or primer pressure signs around 64gr or a stiff bolt.

    Those numbers above came out of Quick Load with a temp setting of 40 degrees. The warmer the more the pressure goes up. All rifles are different so keep fooling with it....be safe!!
     
  5. Barrelnut

    Barrelnut Well-Known Member

    Messages:
    3,427
    Joined:
    Dec 16, 2013
    Thanks, Jim. Very good info. I think I need to bite the bullet and get QL
     
  6. Barrelnut

    Barrelnut Well-Known Member

    Messages:
    3,427
    Joined:
    Dec 16, 2013
    Also... I have a long throat on my 300 WSM for the 210 berger. So when I use a 180 Gn bullet I have lots of throat left. I think that is how I'm getting to 64 Gn of RL-17 without pressure. Just another reason to get QL and figure out some of this out myself I guess.
     
  7. Dexter Grayson

    Dexter Grayson Member

    Messages:
    19
    Joined:
    Feb 2, 2014
    Awesome info. I'll call nosler again tomorrow and verify what I think I heard.

    Thanks
     
  8. kcebcj

    kcebcj Well-Known Member

    Messages:
    1,215
    Joined:
    Jan 28, 2008
    If you reload for different rifles and fool with different bullets and want to figure out where the powder is burned at 100% with a particular load and a whole lot more it will be the best money you can spend on a reloading "tool" Customer service is fair-good.
     
  9. Dexter Grayson

    Dexter Grayson Member

    Messages:
    19
    Joined:
    Feb 2, 2014
    What are the repercussions of shooting a load that hot?
     
  10. brentc

    brentc Well-Known Member

    Messages:
    2,110
    Joined:
    Apr 3, 2009
    You run the risk of damaging your rifle, potentially yourself, especially when shooting in hot weather. A hot load at 60-70 degrees with rl17 gets real hot at 90 degrees. Other than the risk of damaging your rifle, brass life suffers.