Thread: reloading 308 win

Originally Posted by steven

Sorry, etgts = electronic targets. The ones in New Zealand from Silver mountain targets only work with a projectile that is still supersonic. HBC is one of several 308w 155gr match grade HPBT's used. It has a secant ogive I think making its seating depth picky but its slippery. So to be still Supersonic at 1000yds you want about 1250fps, if using a HBC projectile 45.5gr of ADI 2208 is about right. The Nossler match with the same load will have dropped about 120fps+ so usually fails to register.

Speed of sound is about 1120 fps at sea level.

I shoot a 155gr Lapua Scenar with 44.5gr 2208 in Lapua Palma cases through a 32" 1:10 True-Flite barrel at 2840 fps.
The projectile's still supersonic at 1000 yards and registers on electronic targets.

I've also shot a 80gr Amax projectiles from a Savage 223 that still are supersonic at 1000 yards and register on e-targets.

Originally Posted by Cyclops

Speed of sound is about 1120 fps at sea level.

I shoot a 155gr Lapua Scenar with 44.5gr 2208 in Lapua Palma cases through a 32" 1:10 True-Flite barrel at 2840 fps.
The projectile's still supersonic at 1000 yards and registers on electronic targets.

I've also shot a 80gr Amax projectiles from a Savage 223 that still are supersonic at 1000 yards and register on e-targets.

From experience of our etgts at Trentham anything less then 1200fps is unreliable. So same load of 45.5gr of 2208 with nosslers the ones that registered had about 1170fps maybe 2 out of 5 or 6 (sat there did that) 45gr behind a Nossler will not register at all. Generally HBC and the Lapua seem very comparable in terms of BC showing 100fps more than nosslers from what I can see, 45.5gr of 2208 for them seems 100% reliable, this is probably gun dependant, the last barrel it had wouldnt register at all at 1000yds we had to bin it.