Re: 6.5x47 with 140's
I plan to load some 140s for my upcoming Lapua build with a 22" barrel. I was offered the below loads from a guy with QuickLOAD.
Expect a 25-50 fps increase per extra inch of barrel. Also don't forget to reduce these charges by 5-7% to start.
Lastly, if your barrel is 24" or longer, don't forget to try RL 15, RL17, and H4350. I'm sorry, I can't help you with charge weights for these powders.
<div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body">Berger 140 V [It is 1.399" long, boat tailed with a .197" base and .21" of taper, is all I know.] 22" barrel, no moly, 2.8" OAL, max pressure 72kpsi:
Jamming the bullet into the lands is like a 2 gr increase in powder, so don't have that as an out of control variable.
We are assuming a 3,600 psi start pressure in your quickload calcs.
Normally, 2k is off the lands and 5 k is into the lands, but you have a small bullet area, so 3.6k is what we are using.
H4895 38.5 gr 71,867 psi, 2755 fps, 101.7% fill ratio
N135 37.2 gr 71,995 psi, 2699 fps, 104.9% fill ratio
N140 39.4 gr 72,241 psi, 2739 fps, 104.8% fill ratio
Varget 38.6 gr 72,088 psi, 2776 fps, 101.9% case fill
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I also found this in my collection of random comments from folks loading for the 6.5 Lapua;
<div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body">I'm getting 2850 with the 139 Scenar, 43 grains of Ramshot Hunter, CCI 450 in the 6.5x47 Lapua. 25" 3 groove Lija.</div></div>