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Joined: Jan 2011
Posts: 590
Campfire Regular
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OP
Campfire Regular
Joined: Jan 2011
Posts: 590 |
I've worked up a load for my target rifle and it did not pan out like I thought. Where it shoots best, the node seems really small. I would appreciate if someone would run quick load for me and give me an idea of optimum barrel time to see if I am in a node or not or I can see what else I should try. I am working on getting a lap top for the main reason of getting quick loads, but that might take a few month. The info is as follows.
Cartridge: 308 Winchester
Bullet: 185 Berger Juggernaut
Measured bullet length:
Measured bullet boat-tail diameter:
Powder: Varget
Charge Weight (optional): Nodes seem to be at 42.5 and 44.2
Case: Lapua
Length: Trimmed to 2.007
Measured H20 Capacity*: 55.84
COAL: 2.997 is maximum jammed
Bullet touching/jammed into lands at COAL?: Jammed with 1/2 thousandth neck tension
Barrel: Bartlein 5 groove
Length: 29.5
Twist Rate: 10
Last edited by jsthntn247; 04/01/14.
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Joined: Jun 2009
Posts: 1,697
Campfire Regular
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Campfire Regular
Joined: Jun 2009
Posts: 1,697 |
I don't know if that's the right bullet or not... Here's what I see QuickLOAD is saying. Cartridge : .308 Win.
Bullet : .308, 185, Berger M T VLD #30413-513
Useable Case Capaci: 49.225 grain H2O = 3.196 cm³
Cartridge O.A.L. L6: 2.997 inch = 76.12 mm
Barrel Length : 29.5 inch = 749.3 mm
Powder : Hodgdon VARGET
Predicted data by increasing and decreasing the given charge,
incremented in steps of 0.699% of nominal charge.
CAUTION: Figures exceed maximum and minimum recommended loads !
Step Fill. Charge Vel. Energy Pmax Pmuz Prop.Burnt B_Time
% % Grains fps ft.lbs psi psi % ms
-07.0 91 39.90 2524 2617 51990 5340 99.2 1.442 ! Near Maximum !
-06.3 92 40.20 2539 2649 52885 5369 99.3 1.433 ! Near Maximum !
-05.6 92 40.50 2555 2681 53798 5397 99.4 1.423 ! Near Maximum !
-04.9 93 40.80 2570 2713 54730 5425 99.5 1.413 ! Near Maximum !
-04.2 94 41.10 2585 2746 55682 5452 99.6 1.403 ! Near Maximum !
-03.5 94 41.40 2601 2778 56653 5478 99.6 1.393 ! Near Maximum !
-02.8 95 41.70 2616 2811 57645 5504 99.7 1.384 ! Near Maximum !
-02.1 96 42.00 2631 2844 58658 5528 99.8 1.374 ! Near Maximum !
-01.4 96 42.30 2646 2877 59691 5552 99.8 1.365 !DANGEROUS LOAD-DO NOT USE!
-00.7 97 42.60 2662 2910 60747 5575 99.9 1.356 !DANGEROUS LOAD-DO NOT USE!
+00.0 98 42.90 2677 2943 61824 5598 99.9 1.346 !DANGEROUS LOAD-DO NOT USE!
+00.7 98 43.20 2692 2977 62924 5619 99.9 1.337 !DANGEROUS LOAD-DO NOT USE!
+01.4 99 43.50 2707 3010 64048 5640 100.0 1.328 !DANGEROUS LOAD-DO NOT USE!
+02.1 100 43.80 2722 3043 65195 5660 100.0 1.319 !DANGEROUS LOAD-DO NOT USE!
+02.8 100 44.10 2737 3077 66367 5679 100.0 1.310 !DANGEROUS LOAD-DO NOT USE!
+03.5 101 44.40 2752 3111 67563 5697 100.0 1.301 !DANGEROUS LOAD-DO NOT USE!
Results caused by ± 5% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 5% relative to nominal value:
+Ba 98 42.90 2721 3043 66098 5483 100.0 1.316 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 5% relative to nominal value:
-Ba 98 42.90 2623 2826 57635 5661 99.0 1.381 ! Near Maximum !
OBT claims a node at 1.346ms with a 29.5 in barrel. That would put you at 42.9g, but QuickLOAD believes you are red-lining it there... But you also really need to tune QuickLOAD with chronograph results to attempt to nail it down.
“There are three things all wise men fear: the sea in storm, a night with no moon, and the anger of a gentle man.”
― Patrick Rothfuss, The Wise Man's Fear
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