Quantcast
  1. Sign up now and join over 35,000 northwest gun owners. It's quick, easy, and 100% free!

RL15 max out?

Discussion in 'Ammunition & Reloading' started by FA9, May 6, 2015.

  1. FA9

    FA9 Hillsburrito, ORgun Well-Known Member

    Messages:
    690
    Likes Received:
    331
    RL15 under 168gr pill 308win 20in barrel AR10 lc brass cci #200 primers. I chrono'd this pass weekend, here are the results:

    44 grains avg. 2583 fps
    44.5 grains avg. 2587 fps

    Do I stop? or keep going? Trying to get atleast 2600fps but it seems like I peaked out? First time using this powder.
     
  2. Morpheus

    Morpheus Columbia Gorge Anyway, back on the farm.

    Messages:
    1,113
    Likes Received:
    589
    I've never loaded with RL15, what do the books max out for this cartridge?

    If those values were Varget, you would be near max charge weight.
     
  3. orygun

    orygun West Linn Bronze Supporter Bronze Supporter

    Messages:
    3,772
    Likes Received:
    1,949
    I've used RL15 in the 375 Ruger and the 7mm-o8. With the 375 I got what I wanted before having the results you did. With the 7mm-08, I didn't experiment enough to say.
    However, I use RL22 in the 30-06 and have stumbled across the same issue you have. Without knowing anything else, I'd say that you are where you "need to be" at 44 grains and the other half grain is worthless. Without knowing what the loading manuals say (for what it's worth) I'd say that you are just about ready to go above what's regarded as safe. My hunch is that if you bump the charge a half or even a grain more, you'll see a bigger jump in velocity, but are likely on the wrong side of max. At that point pressures start to rise greatly.
    In my rifle I see it "hit the wall" of fps like you did right at book max and one grain over, then it bumps up again to a 50 or 75fps gain per grain. I know at this point that I'm way over what the book is calling safe, but can't see a visible, or mechanical sign (sticky bolt lift). Time to stop.
     
  4. FA9

    FA9 Hillsburrito, ORgun Well-Known Member

    Messages:
    690
    Likes Received:
    331
    I've read that best accuracy is attained just below max loadings. So maybe I won't chance it.


    Hornady 7th ed. max 44.3 gr 2600 fps
    Lyman 49th ed. max 44.8 gr 2724 fps

    My usual powder is Varget, but you know how that goes, so I was trying out another brand.
     
  5. orygun

    orygun West Linn Bronze Supporter Bronze Supporter

    Messages:
    3,772
    Likes Received:
    1,949
    From what you say the manuals say, I'd say you're there.
    I understand pushing for velocity, I do the same. However I've found that in my gun best accuracy is usually a grain or so lower.
    The loading manual probably also used a barrel longer than 20".
     
    FA9 likes this.
  6. FA9

    FA9 Hillsburrito, ORgun Well-Known Member

    Messages:
    690
    Likes Received:
    331
    This.

    Totally slipped my mind:oops:
     
    orygun likes this.
  7. 2ndtimer

    2ndtimer SE Washington state Active Member

    Messages:
    316
    Likes Received:
    119
    So far my best load in my 24" barrel Savage 10T has been 42.5 gr of IMR-4064 with a 168 gr HPBT. It only chronos around 2550 fps, but shoots 4 shots around half MOA. I have some other powders to try, but accuracy is my primary goal and so far the IMR-4064 load is looking like the one.