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More 300 RUM/260 SXR Results

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  #1  
Unread 05-21-2011, 08:47 PM
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More 300 RUM/260 SXR Results

Rich got me a bunch of these and there's no doubt they're going to work.

I used 98 grains of US869 and they clocked 2840 fps from my 27" 1:8 Benchmark. There was no sign of pressure or even any indication I was getting close to a pressure sign--I could have added more powder. I'm going to leave it there for now though since the temps were only in the high 50's, I want to leave some room for summer temps.

They're going to be there accuracy wise as well. I'll still play with seating depths a bit more, etc, but they're doing pretty well already with little load development. Here are the groups at 100 yds:



It should be noted those were shot with only a 10X scope which was removed and reinstalled for each group (testing the return to zero of new rings).
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  •   #2  
    Unread 05-21-2011, 09:04 PM
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    Re: More 300 RUM/260 SXR Results

    Sound good can we get some more bullet details I have never heard of them
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      #3  
    Unread 05-21-2011, 09:43 PM
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    Re: More 300 RUM/260 SXR Results

    Quote:
    Originally Posted by ICANHITHIMMAN View Post
    Sound good can we get some more bullet details I have never heard of them
    ^^^^ what he said!!
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      #4  
    Unread 05-21-2011, 11:25 PM
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    Re: More 300 RUM/260 SXR Results

    I'm sorry, here's a pic:



    From left: 208 A-Max, 210 SMK, 240 SMK, 260 SXR.

    For this batch he also put serrations on the nose of the jackets so they should really expand at long range (I'm going to hunt with these next season).

    Sometime in the next couple months I'll try and get an accurate BC measurement. I expect they'll be somewhere in the .420 G7 range, but we'll see what the Oehlers say. If they come anywhere close to that, they're in a whole different league than any 30 cals I've ever shot. Turns the 300 RUM (or other big 30) into a serious contender.
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      #5  
    Unread 05-21-2011, 11:42 PM
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    Re: More 300 RUM/260 SXR Results

    What is the probability/ timeframe for these to go into production? That would really sway me towards building a 1-8 twist rum, I'm on the fence between one of those or a 338 edge once my 6.5mm Voodoo goes south. Which I don't expect to be too long!
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      #6  
    Unread 05-22-2011, 08:31 PM
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    Re: More 300 RUM/260 SXR Results

    I'm just testing the waters with these right now and using Jon as the "Voluntary Guinea Pig". If they work out well, and I think they will, I may well produce them if there is enough interest? They are not cheap to make, but well worth it if you want to hunt long range with a 300. I've been using a "lighter" version for some time in my 300 Sherman with great success. I could also make a bonded version, but really don't see the need when you have a S.D. similar to a javelin. (higher S.D. and B.C. than a 300 grain .338) and with the velocities Jon is getting, you can launch them as fast as most of the big .338's. I am expecting adequate expansion down to at least 1400'.......Rich

    Last edited by elkaholic; 05-22-2011 at 08:38 PM.
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      #7  
    Unread 05-22-2011, 08:35 PM
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    Re: More 300 RUM/260 SXR Results

    Quote:
    Originally Posted by Jon A View Post
    Rich got me a bunch of these and there's no doubt they're going to work.

    I used 98 grains of US869 and they clocked 2840 fps from my 27" 1:8 Benchmark. There was no sign of pressure or even any indication I was getting close to a pressure sign--I could have added more powder. I'm going to leave it there for now though since the temps were only in the high 50's, I want to leave some room for summer temps.

    They're going to be there accuracy wise as well. I'll still play with seating depths a bit more, etc, but they're doing pretty well already with little load development. Here are the groups at 100 yds:



    It should be noted those were shot with only a 10X scope which was removed and reinstalled for each group (testing the return to zero of new rings).
    Nice job Jon and REALLY good news! I'll be anxious to hear about b.c. and expansion.....Rich
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