Vihtavuori N140

courser

Well-Known Member
I have just acquired 1kg of N140. Is there any data for a .223 with a one in fourteen twist barrel using 50-55g bullets? The rifle is a Thompson Center, Contender G2. I bought it (the powder) by mistake and I cannot find any data for anything less than 60g which a one-in-fourteen will not stabilise.
 
the Vhit manual (last years, there is a new one out) gives 24.2grns as a starting point for Lapua 55 grn softpoints, try downloding the latest manual.
 
here you go feller.
BulletPowderStarting loadMaximum load
WeightTypeMfgC.O.LTypeWeightVelocityWeightVelocity
[g][grs] [mm][in.] [g][grs][m/s][fps][g][grs][m/s][fps]


,250TNT-HPSpeer57,02.244N1201,2519.391129891,4722.710363399
N1301,4322.194731071,5924.510463432
N1331,5624.199032481,68F25.9F10773533
N1351,6525.599932781,68F25.9F10183340
3,351HPCELapua57,02.244N1201,2319.090929821,3721.19913251
N1301,3520.893030511,5123.310183340
N1331,4522.494330941,61 A24.8 A1033 A3389 A
N5301,5323.696331591,6625.610523451
N1351,5423.895731401,68F25.910343392
3,452HPBTSierra57,02.244N1301,3721.193630711,5423.810283373
N1331,4622.594831101,6225.010333389
N1351,5423.880826511,66F25.6F10393409
3,655Soft PointLapua56,52.224N1201,0916.882026901,3120.29393081
N1301,2118.785728121,4221.99593146
N1331,3621.087628741,5624.19803215
N1351,4322.189929491,64F25.3F10043294
N5301,4422.289129231,6124.89953264
N1401,5724.291530021,74F26.9F10143327
 
I have just acquired 1kg of N140. Is there any data for a .223 with a one in fourteen twist barrel using 50-55g bullets? The rifle is a Thompson Center, Contender G2. I bought it (the powder) by mistake and I cannot find any data for anything less than 60g which a one-in-fourteen will not stabilise.

There are two barrel lengths 14" (G2 Contender Pistol) and 23" (G2 Contender Rifle).

I'm sure that both are the standard .223 1:12" twist (not 1:14").

Even if it was 1:14 there's no problem in stabilising 60gr bullets.

Your N140 will work fine.
 
Last edited:
My Contender G2 rifle had a 23in barrel but was cut down to 20in and threaded for a mod by it's previous owner. I was told that it had a 1:14 twist but that may be wrong, I hope so. Thanks for the help.
 
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