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338 Edge/ABS break in/development.

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  #8  
Unread 07-09-2009, 09:43 PM
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Re: 338 Edge/ABS break in/development.

With cases this big, it has been my experience that it doesnt take much lot to lot varience, chamber demension differences or throat differences to make HUGE changes in velocity from one rifle/load to the next.

When one guy uses X grains of X powder, and another uses the exact same load and they get 2 totally different velocities, the lot of powder used, chamber dimensions, throat length, how far into or off the lands their running makes a HUGE difference in velocity. Hence the reason equal velocities arent always found with the same powder charges.

I guarantee you guys that with my short throat and tight chamber, if I were to run 92-94 grains of H1000 under the 300 SMK, I would be in serious trouble. Now if I lengthend the throat and increased case capacity by seating the bullets further out, I would be in buisness.

Hence the statement in every reloading manual. Start low and work up. It doesnt seem to be near as critical nor as dangerous with smaller calibers such as the 308 winnie and such but the bigger mags are very tempermental and show there tempers when little things are different.
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  •   #9  
    Unread 07-09-2009, 09:54 PM
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    Re: 338 Edge/ABS break in/development.

    Quote:
    Originally Posted by Coyboy View Post
    AJ, Pro-crony, yea I know but it's all I got. I had a friend over who was running 94.5 and using his brass once!! at 2930fps, 30"

    One had a 28" barrel running right at 2700- 2710 with the other being a 30" at 2750. The 30 inch gun is my own and I believe my current load is 2780's fps with 90 grains

    But the difference between us could be chaulked up to ; crony, powder scale, barrel manf., powder lot, who knows what else. 2750 does seems a little slow to me with 92 grains, but what the heck if she is shooting whats a few fps.

    Thanks, just curious. Dogdinger's rifle shoots a higher fps than mine with 92gr and is on the edge of being sticky, mine seems like nice gentle pressure. Every rifle is certainly unique.

    thanks,
    AJ
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      #10  
    Unread 07-09-2009, 10:27 PM
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    Re: 338 Edge/ABS break in/development.

    Michael,

    Thanks for sharing your break-in and load development. Must be a lot of fun getting a new shooting stick on line.

    Why did you opt for a short throat?

    -MR
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      #11  
    Unread 07-09-2009, 11:34 PM
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    Re: 338 Edge/ABS break in/development.

    Quote:
    Originally Posted by MontanaRifleman View Post
    Michael,

    Thanks for sharing your break-in and load development. Must be a lot of fun getting a new shooting stick on line.

    Why did you opt for a short throat?

    -MR
    I can always make it longer!

    I cant ever make it shorter without setting the barrel back.

    I may opt in the near future to lengthen it but I will wait a few rounds and see how it holds up. the 300 RUM throat cooked very fast and I want to be able to clean it up a touch a few times need be. So far all looks good.
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      #12  
    Unread 07-10-2009, 10:55 AM
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    Re: 338 Edge/ABS break in/development.

    Michael,
    Glad to hear the Edge is a shooter and easy to clean. Your horror stories about the 300 RUM are making me want to look at the throat on my Remington factory tube (or maybe I don't want to look!) I got it used but I doubt there were many rounds through it and I put about 50-60 rounds through it last fall. So far it is an excellent shooter with the 200 gr AB. I'm way off the rifling due to mag length restrictions, wonder if that makes any difference in throat wear?
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      #13  
    Unread 07-10-2009, 05:12 PM
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    Re: 338 Edge/ABS break in/development.

    I would let the chony tell you whats going on before you scope the bore. If your day to day velocity is reasonably close AND your accuracy is the same, I wouldnt sweat it. When your day to dayvelocity average starts to creep up, then get it looked at.

    My opinion is that it isnt as critical with factory sticks. They are "rougher" than custom barrels and tend to "smooth" out over time buying you some more time. A factory barrel will actually improve with some time. When you start with a perfect smooth mirror bore with perfect tolerences, it has no where to go but downhill. In my case it was down hill fast and caused alot of extra friction and pressure shortly after the initial development.

    From everything I have gathered, what I experienced was NOT the norm. Yes the 300 RUM is a barrel burner but it seems like mine cooked exceptionaly fast and for no apparent reason. The barrel was rockwell tested and came back perfect so who knows why.

    My old Lilja barrel did show me all the same signs as my ABS just at a MUCH slower pace. I have nearly 1100 rounds down the bore and while I had to drop my loads some like I did the ABS it has been consistent since I did. It still shoots groups nearly as good as day 1.
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    Long range shooting is a process that ends with a result. Once you start to focus on the result (how bad your last shot was, how big the group is going to be, what your buck will score, what your match score is, what place you are in...) then you loose the capacity to focus on the process.
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      #14  
    Unread 07-10-2009, 05:35 PM
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    Re: 338 Edge/ABS break in/development.

    your load/speed does seem very low to me. i've shot the 250SMK's out of my edge the last couple years and go about 3050 with 97 gr of h1000 powder. mine has a 29" barrel. i'm building a lightweight edge and planning on shooting the 225ttxs with it. will be an interesting rig.
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