Re: Hand Loading for Long Range 4: Powderin' it
Thanks a lot for the information you put down in these reloading threads TresMon, I've read them couple of times now and the have solid information to a new reloader/shooter.
Passed 3years I've been shooting those 3shot groups at 100 meters to get the best groups so I was curious to try out the ladder test and here is the result with .308 @ 300 meters. I shot 13 loads from 40gr to 46gr (Where 44gr is the book maximum), shot 12 and 13 started to show slight overpressure. (Bullet was 155 Scenar and powder is N140 Vihtavuori)
My question is why do sometimes hotter charges impact lower? Is it my shooting that screwed things up or some other factor that I'm not thinking of. (Right after this ladder a shot a 3shot 1/2 moa group at 100 meters (With 168gr SMK) to check if my shooting sucked or other things where screwing the test up.)
NOTE: Shots 1-3 where shot earlier than 4-13 due to unexpected interruption at the shooting range, in the mean time the wind calmed down. (had moderate wind from right to left) which explains the horizontal travel of the ladder.
I would guess that shots 7,8,9 are my candidates for retesting at 500 meters (43, 43.5 and 44 grains). That group is 0.8 inches at 300 which I would be very happy about if I could produce on average with my final load.
So any ideas on the hotter loads hitting lower?
Thanks again for this write up! These threads have proven very valuable in my learning curve as a reloader!
ikalli