B-tip Results...

[Powerstroke]

Now that my big-game hunting is over it's time to play with the new toy I purchased last fall and really havent' got a chance to shoot. I'm a big fan of the Viht powders and decided to give the N-140 a try in the .223 VTR w/60grain B-tips. The VTR has a 1 in 9 twist barrel in the .223 so I've been hoping I can get the 60gr B-tips to shoot.
The target is the first 5 shots this morning on a "clean barrel " low right shot was #1 I think I found my powder and bullet :grin: Yote hunting this winter is going to be fun.... I also launched one into some milk jugs and was pleased with the results... I figured the 60gr B-tip would be constructed a littel heavier, but it came appart quite nicely. 20.5 grains recovered.

 

[JD338]

Powerstroke

Nice shooting load. I envy you being able to shoot the 60 gr BT. It just won't stabilize in my 1:14 twist 22-250.
How many water jugs did the 60 gr BT penetrate?

JD338

 

[Powerstroke]

JD....

I had a couple 2.5 gallon water jugs... @ 100 yds it won't make it out the back side of one....

 

[JD338]

JD....

I had a couple 2.5 gallon water jugs... @ 100 yds it won't make it out the back side of one....

Perfect!

JD338

 

[FOTIS]

Cool...nice load

Cartridge : .223 Rem.
Bullet : .224, 60, Nosler Ballistic Tip
Cartridge O.A.L. L6: 2.260 inch or 57.40 mm
Barrel Length : 22.0 inch or 558.8 mm
Powder : Vihtavuori N140

Predicted data by increasing and decreasing the given charge,
incremented in steps of 2.0% 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

-20.0 91 20.80 2412 775 27072 5751 83.5 1.310
-18.0 93 21.32 2473 815 28945 5950 85.0 1.274
-16.0 95 21.84 2535 856 30956 6145 86.4 1.239
-14.0 97 22.36 2597 898 33118 6335 87.8 1.205
-12.0 100 22.88 2659 942 35444 6519 89.1 1.172
-10.0 102 23.40 2722 987 37948 6698 90.4 1.139
-08.0 104 23.92 2784 1033 40648 6869 91.5 1.104
-06.0 106 24.44 2847 1080 43562 7032 92.7 1.071
-04.0 109 24.96 2910 1128 46711 7187 93.7 1.038
-02.0 111 25.48 2974 1178 50118 7333 94.7 1.007
+00.0 113 26.00 3037 1229 53810 7469 95.6 0.977 ! Near Maximum !
+02.0 116 26.52 3100 1281 57817 7593 96.4 0.948 ! Near Maximum !
+04.0 118 27.04 3164 1334 62179 7706 97.2 0.919 !DANGEROUS LOAD-DO NOT USE!
+06.0 120 27.56 3228 1388 66928 7806 97.9 0.892 !DANGEROUS LOAD-DO NOT USE!
+08.0 122 28.08 3291 1443 72086 7893 98.4 0.865 !DANGEROUS LOAD-DO NOT USE!
+10.0 125 28.60 3355 1499 77706 7966 98.9 0.840 !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 10% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 10% relative to nominal value:
+Ba 113 26.00 3194 1359 64761 7499 99.4 0.906 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 113 26.00 2836 1071 43869 7084 88.1 1.068

 

[Powerstroke]

POP,

Thanks !! I took the load out of the Sierra Book and started on the low side.....That 5 shot group averaged 3057 fps....

 

[FOTIS]

POP,

Thanks !! I took the load out of the Sierra Book and started on the low side.....That 5 shot group averaged 3057 fps....

and quickload predicted 3037...gotta love it.... :lol: