Speer Bullets
- Thread starter Worker
- Start date
DR4NRA
New member
A bullet with a high BC will travel farther than one with a low BC (see external ballistics). Since dense materials give more mass for a given volume or cross-section, bullets often employ lead in their construction, due to its low cost and relatively high density. When two bullets of the same weight are constructed from different materials, the one fashioned from the higher density material will have a higher BC.
Not every company uses the same materials. Except for Nosler the diffrence is .006 so I dont really see why its a big deal.
Good Shooting
DR
Not every company uses the same materials. Except for Nosler the diffrence is .006 so I dont really see why its a big deal.
Good Shooting
DR
E
eshell
Guest
Worker, I wouldn't be surprised if Speer's BC wasn't a little overstated, but I don't know what it should be, especially when you put it next to the Berger. .006 really is "nothing", and there should be "something".
DR, the bullet composition is related to "sectional density", which you actually indicate in your discussion when you reference "mass for volume (density) and cross sectional. Ballistic coefficient is solely related to shape, and the manner in which a bullet encounters drag.
While heavier bullets often have higher BCs, it is more because they are long for caliber rather than the fact that they are heavy. Many high BC bullets will have a large air pocket in front of the lead core.
DR, the bullet composition is related to "sectional density", which you actually indicate in your discussion when you reference "mass for volume (density) and cross sectional. Ballistic coefficient is solely related to shape, and the manner in which a bullet encounters drag.
While heavier bullets often have higher BCs, it is more because they are long for caliber rather than the fact that they are heavy. Many high BC bullets will have a large air pocket in front of the lead core.
DR4NRA
New member
http://www.frfrogspad.com/bcdata.htm
http://en.wikipedia.org/wiki/External_ballistics
http://en.wikipedia.org/wiki/Ballistic_coefficient
http://www.shootingsoftware.com/ballistics.htm#EBGC
I have posted 4 links that will give you the more than enough information to answer your question. There are way too many variables, and diffrences in manufacturer to put up here. In these links it is stated that most US manufacturers use the over 100 year old G1 model for thier calculations.
eshell its not as simple as you make it sound.
Good Shooting
DR
http://en.wikipedia.org/wiki/External_ballistics
http://en.wikipedia.org/wiki/Ballistic_coefficient
http://www.shootingsoftware.com/ballistics.htm#EBGC
I have posted 4 links that will give you the more than enough information to answer your question. There are way too many variables, and diffrences in manufacturer to put up here. In these links it is stated that most US manufacturers use the over 100 year old G1 model for thier calculations.
eshell its not as simple as you make it sound.
Good Shooting
DR
R
R.DesJardin
Guest
Bc
It's not Speer that makes up the BC, it comes from the data recieved in the tunnel from the Oehler System we use. There are different variables that be set but we generally use G1 as the std. Hope this helps.
It's not Speer that makes up the BC, it comes from the data recieved in the tunnel from the Oehler System we use. There are different variables that be set but we generally use G1 as the std. Hope this helps.
Further details
I started this thread. I shoot a 6x284. I've been loading 60.5grs of AA MagPro producing 3650 FPS with 87gr V-max. I'm not seeing any pressure signs with this powder like I did with Re#22 or IMR 7828I saw pressure signs with MV of 3550. Any how accuracy with I think the V-max is marginal.(3/4 MOA) So I picked up some Speer 85gr SPBT for $14 bucks I couldn't resist ( They only had one box)Check the book and hey a lighter bullet has a higher BC then either a 87gr V-max or a 90gr Berger HPBT ?????? How could this be? I inserted both bullets into a sinclair bullet nut. The V-max measures 1.495 and the Speer measures 1.395. Seated the Speer with out adjusting seating die and the case would barley hold the bullet. Carefully chambered a RND and there were no rifling marks. As with the V-Max there are. So question with same charge of Magpro what performance do you all predict? In past I've found this rifle likes bullets touching the lands. But that can't be done with this bullet,case won't hold the bullet.
I started this thread. I shoot a 6x284. I've been loading 60.5grs of AA MagPro producing 3650 FPS with 87gr V-max. I'm not seeing any pressure signs with this powder like I did with Re#22 or IMR 7828I saw pressure signs with MV of 3550. Any how accuracy with I think the V-max is marginal.(3/4 MOA) So I picked up some Speer 85gr SPBT for $14 bucks I couldn't resist ( They only had one box)Check the book and hey a lighter bullet has a higher BC then either a 87gr V-max or a 90gr Berger HPBT ?????? How could this be? I inserted both bullets into a sinclair bullet nut. The V-max measures 1.495 and the Speer measures 1.395. Seated the Speer with out adjusting seating die and the case would barley hold the bullet. Carefully chambered a RND and there were no rifling marks. As with the V-Max there are. So question with same charge of Magpro what performance do you all predict? In past I've found this rifle likes bullets touching the lands. But that can't be done with this bullet,case won't hold the bullet.
Measured BC is derived by the fallowing specifications:
- Diameter
- Weight
- OAL
- Meplat Diameter
- Boat-tail Angle
- Boat-tail Length
- Ogive Radius
- plus ambients.....
Captured BC is derived by:
- Capturing the velocity of a bullets path at two separate distances (such as 10' and 300')
- by Radar (over distance)
Happy Shooting
Donovan Moran
- Diameter
- Weight
- OAL
- Meplat Diameter
- Boat-tail Angle
- Boat-tail Length
- Ogive Radius
- plus ambients.....
Captured BC is derived by:
- Capturing the velocity of a bullets path at two separate distances (such as 10' and 300')
- by Radar (over distance)
Happy Shooting
Donovan Moran