Thread: Norway's LR film (full feature)

Originally Posted by ebf

Next question:

In the wind section, you compare 6.5x55 to 308. At around 1:24:40, you say that at 800m with 2m/s wind, your rule of thumb gives 18 clicks.

18 (0.1mil clicks) = 1.8 milrad = +/- 6 MOA

I've had a look at my windage tables and to need 6 MOA windage adjustment at 900yds (closest I have to 800m) the wind would need to be 8 mph or about 3.5 m/s.

So not sure what projectile you were using for 308, but that does not match the windage data I am using to shoot long range competitions (155gr Scenar @ 3020 fps).

Also ran some tests on JBM Ballistics for (using wikipedia speeds )

.308 155 Amax @ 910 m/s for full value 2m/s wind = 11 clicks @ 800m
.308 155 SMK @ 910 m/s for full value 2m/s wind = 10 clicks @ 800m

.264 100 Amax @ 970 m/s for full value 2m/s wind = 11 clicks @ 800m
.264 120 SMK @ 860 m/s for full value 2m/s wind = 13 clicks @ 800m

Maybe I am missing something obvious, but can't see the massive difference between the 2 calibers...

I think the answer to your question is that the range card for the 308 was worked out with V0 at 755 m/s...

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