ammo weight ?
Hey fellas. I'm learning here so play nice...
I have noticed as I'm reading thru the threads that most people shoot "heavy" .308 ammo. I say heavy but that's because I ha e been shooting 145 gr. And 150 gr. But that's pretty much all I ha e been able to find on the shelf. I am talking factory loads because I'm not reloading yet? So is there a reason for the heavier bullet other than more penetration on game ? I'm assuming that barrel length and twist have quit a bit to do with it.
I have been trying a few different types of ammo and I have noticed that my gun shoot just about everything pretty good except the surplus privi ..2 inch group at 100 yds with 3 fliers on a 10 shot group. That stuff is really inconsistent.
Fyi... My gun is the remy 700 sps tactical . With a 20 barrel.
the heavier match bullets have a higher Ballistic Coefficient. Which make them a much better long range target bullet
on the lighter side, the 155 gr match bullets have a high BC as well
Originally Posted By iluvguns:
the heavier match bullets have a higher Ballistic Coefficient. Which make them a much better long range target bullet
on the lighter side, the 155 gr match bullets have a high BC as well
This for the most part. If you look at the 155gr scenars they have a higher BC than some heavier bullets. And my rifle shoots the 155gr range best.
Aerodynamics trump initial (muzzle) velocity in the long run, and do so more and more the farther out you shoot. So it pays to have a heavy, sleek, aerodynamic bullet initially going 150 fps slower because it will retain that velocity better than a 147 gr. military FMJ going 150fps faster.
Bullets like the 155 scenar are a bit of an exception, taking the best of both worlds, as it were (aerodynamics and velocity), though their BC is still not quite as good as the heavier offerings.
Originally Posted By LedZeppelin:
Aerodynamics trump initial (muzzle) velocity in the long run, and do so more and more the farther out you shoot. So it pays to have a heavy, sleek, aerodynamic bullet initially going 150 fps slower because it will retain that velocity better than a 147 gr. military FMJ going 150fps faster.
Bullets like the 155 scenar are a bit of an exception, taking the best of both worlds, as it were (aerodynamics and velocity), though their BC is still not quite as good as the heavier offerings.
Sierra 175gr HPBT- .505 BC
Lapua 155gr Scenar- .508 BC
Hornady 208gr AMAX- .648 BC
Originally Posted By D-RAS03:
Originally Posted By LedZeppelin:
Aerodynamics trump initial (muzzle) velocity in the long run, and do so more and more the farther out you shoot. So it pays to have a heavy, sleek, aerodynamic bullet initially going 150 fps slower because it will retain that velocity better than a 147 gr. military FMJ going 150fps faster.
Bullets like the 155 scenar are a bit of an exception, taking the best of both worlds, as it were (aerodynamics and velocity), though their BC is still not quite as good as the heavier offerings.
Sierra 175gr HPBT- .505 BC
Lapua 155gr Scenar- .508 BC
Hornady 208gr AMAX- .648 BC
Hornady 178 HPBT .530
As mentioned, the "general" trend is that heavier bullets have a better ballistic coefficient...
That means they buck the wind better and are more aerodynamic.
They mights leave the barrel slower, but usually retain more energy that the lighter/faster bullets once you hit the 200-300yd mark.
If you plan to stretch the legs of the .308 much past 400yds, you'll see a lot of benefit from using these types of bullets.
Originally Posted By iluvguns:
Originally Posted By D-RAS03:
Originally Posted By LedZeppelin:
Aerodynamics trump initial (muzzle) velocity in the long run, and do so more and more the farther out you shoot. So it pays to have a heavy, sleek, aerodynamic bullet initially going 150 fps slower because it will retain that velocity better than a 147 gr. military FMJ going 150fps faster.
Bullets like the 155 scenar are a bit of an exception, taking the best of both worlds, as it were (aerodynamics and velocity), though their BC is still not quite as good as the heavier offerings.
Sierra 175gr HPBT- .505 BC
Lapua 155gr Scenar- .508 BC
Hornady 208gr AMAX- .648 BC
Hornady 178 HPBT .530
I'm going to have to look into that bullet.
Originally Posted By D-RAS03:
Originally Posted By iluvguns:
Originally Posted By D-RAS03:
Originally Posted By LedZeppelin:
Aerodynamics trump initial (muzzle) velocity in the long run, and do so more and more the farther out you shoot. So it pays to have a heavy, sleek, aerodynamic bullet initially going 150 fps slower because it will retain that velocity better than a 147 gr. military FMJ going 150fps faster.
Bullets like the 155 scenar are a bit of an exception, taking the best of both worlds, as it were (aerodynamics and velocity), though their BC is still not quite as good as the heavier offerings.
Sierra 175gr HPBT- .505 BC
Lapua 155gr Scenar- .508 BC
Hornady 208gr AMAX- .648 BC
Hornady 178 HPBT .530
I'm going to have to look into that bullet.
i like it alot, and its cheaper than the smk's
Originally Posted By iluvguns:
Originally Posted By D-RAS03:
Originally Posted By iluvguns:
Originally Posted By D-RAS03:
Originally Posted By LedZeppelin:
Aerodynamics trump initial (muzzle) velocity in the long run, and do so more and more the farther out you shoot. So it pays to have a heavy, sleek, aerodynamic bullet initially going 150 fps slower because it will retain that velocity better than a 147 gr. military FMJ going 150fps faster.
Bullets like the 155 scenar are a bit of an exception, taking the best of both worlds, as it were (aerodynamics and velocity), though their BC is still not quite as good as the heavier offerings.
Sierra 175gr HPBT- .505 BC
Lapua 155gr Scenar- .508 BC
Hornady 208gr AMAX- .648 BC
Hornady 178 HPBT .530
I'm going to have to look into that bullet.
i like it alot, and its cheaper than the smk's
What twist rate do you have? I have 1-10.5" and it loves the 155gr bullets. I haven't tried that heavy yet.
Originally Posted By D-RAS03:
Originally Posted By iluvguns:
Originally Posted By D-RAS03:
Originally Posted By iluvguns:
Originally Posted By D-RAS03:
Originally Posted By LedZeppelin:
Aerodynamics trump initial (muzzle) velocity in the long run, and do so more and more the farther out you shoot. So it pays to have a heavy, sleek, aerodynamic bullet initially going 150 fps slower because it will retain that velocity better than a 147 gr. military FMJ going 150fps faster.
Bullets like the 155 scenar are a bit of an exception, taking the best of both worlds, as it were (aerodynamics and velocity), though their BC is still not quite as good as the heavier offerings.
Sierra 175gr HPBT- .505 BC
Lapua 155gr Scenar- .508 BC
Hornady 208gr AMAX- .648 BC
Hornady 178 HPBT .530
I'm going to have to look into that bullet.
i like it alot, and its cheaper than the smk's
What twist rate do you have? I have 1-10.5" and it loves the 155gr bullets. I haven't tried that heavy yet.
mines a 10 twist, im sure your 10.5 will shoot it fine
