Originally Posted by Long Time Long Ranger
jamie6.5, I am very aware of the 6.5x57 imp or as you call it 6.5x257 roberts imp. It also gained some popularity about 40-50 years ago at the same time as the 7x57 imp did. The 7x57 imp is the better cartridge of the two for several reasons. The guy is asking if the 8x57 is a good long range cartridge. As I said it is not. No good long range bullets available and not enough case capacity for long heavy 8mm bullets that would approach any kind of BC and still have enough velocity for reasonable long range work. As far as picking off people at 500 yards I could easily do that with a 30-30 winchester but it is not considered a long range round either.
I'm afraid that saying that the 8x57mm JS isn't good for long range shooting is to seriously misguide people, I don't blame you however as most Americans know little about this round. Part of the problem lies in the fact that US manfactured ammunition of this type (8x57) in general is way underpowered, not even approaching exploring the true capabilities of this excellent round. The way to go is full power European ammunition, where you can easily get 200 gr bullets doing 2,700+ ft/s through a 23.5 inch barrel no problem.
Fact of the matter is that the 8x57mm JS round is infact quite a good long range round, as long as you use the right type of bullet. It was infact long range lethality that the 8x57mm JS became famous for. During WW2 the 8x57mm JS seated the 198 gr sS FMJBT projectile, the most aerodynamically efficient rifle bullet of the entire war with a G1 BC of .593 at supersonic speeds and .557 at subsonic speeds (That's considerably higher than a modern .308 M118 sniper bullet). With a typical muzzle velocity of 760 m/s through a 600mm barrel this tranlates into a 1,000+ meter effective range, the bullet still traveling at Mach 1.07 at 1,000 meters under International Standard Atmospheric conditions. This bullet enabled German machine gunners to engage Allied troops out to 3,500 meters in the North African desert during WW2, leading the British to sometimes believing they were under automatic cannon fire. Furthermore German snipers recorded confirmed kills out past 1,100 meters with this round (ex. Matthäus Hetzenauer).
Today you can still easily duplicate this performance by either handloading, purchasing select european ammunition or WW2 German surplus.
European munitions manufacturer Sellier & Bellot are currently offering a 196 gr FMJBT in the 8x57mm JS caliber with an average G1 BC of .557 and a muzzle velocity of 790 m/s through a 600mm barrel: Sellier & Bellot - Your ammunition company
Sierra are currently offering their 200 gr HPBT Match King projectile with a G1 BC of .520 for handloaders: Sierra Bullets - The Bulletsmiths
WW2 era Karabiner 98k fired to 1,000 yards against an 18 inch target (human upper torso size), using handloaded 200 gr Sierra Match King projectiles (BC . 520), achieving 3 hits out of 4 tries once zeroed in, and this with a 60 year old rifle in very windy weather:
YouTube - WWII German Mauser 98K rifle at 1,000 yards