mturnbull333
Member
I just bought a LWRC REPR 308 with a 18 inch barrel and a 11.25 twist rate,what is my best bet for bullet grain. I would like to get out to a 1000 plus yrds.
Most match barrels are 1:10 to 1:12 for .308. In my experience 1:12's shoot 175's just fine, along with 155's. There is nothing wrong with 1:11.25
USSRs opinion about shooting the lighter bullet is interesting, because my knee jerk reaction was that a shorter barrel would benefit more from shooting a heavier bullet at lower velocity, since there is so much less barrel to burn powder in. My theory is based on my belief that the heavier bullets don't need as much velocity to maintain their higher ballistic coefficient.
This statement doesn't really make sense mathematically.My theory is based on my belief that the heavier bullets don't need as much velocity to maintain their higher ballistic coefficient.
I really don't know why, but the 168s seem to run out of gas at around 600 yards. Maybe it's because the BC gets too low at the velocity they are moving at that distance.
Compared to a very heavy, but high BC bullet like the 208 or 210, you can push a 175 or 155 fast enough to basically have the same wind drift but 20-35% less drop, usually.
_Bullet_ _BC_ _MV_ 0 200 400 600 800 1000 | YARDS
175 load 0.51* 2700 > 0.00 2.62 11.18 26.93 51.55 86.72 | wind (inches)
155 Scenar 0.508 2925 > 0.00 2.28 9.69 23.24 44.21 74.16 | wind (inches)
210 VLD 0.617 2450 > 0.00 2.39 10.08 23.97 45.14 74.55 | wind (inches)
175 load 0.51* 2700 > -0.00 0.51 2.12 4.17 6.72 9.90 | drop (mil)
155 Scenar 0.508 2925 > -0.00 0.40 1.72 3.42 5.50 8.06 | drop (mil)
210 VLD 0.617 2450 > -0.00 0.65 2.54 4.84 7.59 10.86 | drop (mil)
_Bullet_ _BC_ _MV_ 0 200 400 600 800 1000 | YARDS
175 load 0.51* 2700 > 0.00 2.62 11.18 26.93 51.55 86.72 | wind (inches)
155 Scenar 0.508 2925 > 0.00 2.28 9.69 23.24 44.21 74.16 | wind (inches)
210 VLD 0.617 2550 > 0.00 2.26 9.51 22.60 42.55 70.39 | wind (inches)
175 load 0.51* 2700 > -0.00 0.51 2.12 4.17 6.72 9.90 | drop (mil)
155 Scenar 0.508 2925 > -0.00 0.40 1.72 3.42 5.50 8.06 | drop (mil)
210 VLD 0.617 2550 > -0.00 0.58 2.31 4.42 6.93 9.91 | drop (mil)
USSR
The 155 scenar bc is actually much lower than .505. Lapua updated the all the scenars to a more real world bc, for the 155 is now listed as .460 g1.