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A Precision Ultralight Hunting Rifle

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  #8  
Unread 02-13-2013, 06:58 PM
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Re: Spartan Arms Precision Ultralight Hunting Rifle

Tom

Yes, you can post gun brag topics, including who built it even if they aren't a Sponsor. That's all important to the site and I encourage it.

But...you openly encouraged a non-Sponsor to come on and promote himself. That's not fair to the paying Sponsors and some of them get upset with me if I tolerate it. If you want to start over, you can send me an edited post and I will insert it into the first post spot.

Len
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  •   #9  
    Unread 02-13-2013, 07:02 PM
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    Re: Spartan Arms Precision Ultralight Hunting Rifle

    Quote:
    Originally Posted by Len Backus View Post
    Tom

    Yes, you can post gun brag topics, including who built it even if they aren't a Sponsor. That's all important to the site and I encourage it.

    But...you openly encouraged a non-Sponsor to come on and promote himself. That's not fair to the paying Sponsors and some of them get upset with me if I tolerate it. If you want to start over, you can send me an edited post and I will insert it into the first post spot.

    Len
    On its way. Thank you, Len.
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      #10  
    Unread 02-14-2013, 03:22 PM
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    First Range Report

    After six rounds of factory to zero the scope (that's really the extent of my "break in"), I settled in with some test loads with H4831SC and H4350. All were with 140gr Berger Hunting VLD, virgin Lapua brass, and CCI BR-2 primers. COAL was 0.004" off the lands, for a 3.132" OAL and 2.458" length to ogive.

    Unfortunately, I think I started too low.

    The best load with the H4350 was the top load I had, and it was progressively improving as I pushed the bullet more. At 47.3 grains of H4350, I was showing my best group at 5/16", and 2754 fps. The best load with H4831SC was 51.5 grains, 0.25" and 2817 fps.

    Qualitatively, I love this rifle. Its balance and manners were perfect. It shot everything well, when I did my part, recoil was mild, and the barrel just wouldn't heat up. The last fifteen rounds I shot one right after another, and there was no drift and the barrel stayed warm. Those rounds also included the best group of the day (the 1/4" one).

    I'm going to clean it up and load up another set, starting at the most accurate and working up a bit. I really think I should be able to find something closer to 3000 fps. Then I'll start playing with OAL.

    I suppose I should be finding a decent hunting load and then just preserving barrel life, but this rifle is too much fun to shoot.
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      #11  
    Unread 02-16-2013, 10:59 PM
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    Re: A Precision Ultralight Hunting Rifle

    I'm glad to see the rifle lives up to your expectations Tom. It was definitely a hammer once you got into the hotter loads that it liked. It will be interesting to see if it does any better as you push it harder.

    I'm very impressed with those carbon wrapped barrels from Proof and they are the only carbon barrels I'll use. I can't say too much about their manufacturing process, but I can say that they use thin carbon ribbons that are spun on in a helical pattern to a large diameter, rough turned down to an approximate dimension, then finished ground to final contour. They also make their own blanks in house so they have total control from start to finish. No other carbon barrel maker comes close. Now you can have a light weight barrel without having your groups open up after the third round

    Marc Soulie
    Spartan Precision Rifles
    Concord, CA
    https://www.facebook.com/SpartanPrecisionRifles?ref=hl
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      #12  
    Unread 02-22-2013, 10:40 PM
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    Re: A Precision Ultralight Hunting Rifle

    After some load testing, I'm now seeing H4831SC giving excellent results, 1/4" to 1/3" at 100 yards. I'm going to move out now to longer distances with the same loads.

    Given the terminal ballistics reputation of the 140 gr Berger VLD, I'm betting that this can be my do-everything rifle.
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      #13  
    Unread 02-23-2013, 12:37 AM
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    Re: A Precision Ultralight Hunting Rifle

    Nice rig.I built mine for packing.338 Norma 7-2 oz. bare.Dressed 9-14oz.sling,scope,atlas,aci
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      #14  
    Unread 02-23-2013, 12:28 PM
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    Re: A Precision Ultralight Hunting Rifle

    I definitely traded some portability to get the adjustable stock. I'm sure that, with an ultralight stock, this would be a featherweight in the high 6s or low 7s.

    But when it gets to anything beyond 300 yards, I just shoot much better with an adjustable stock.
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