Speer ballistic coefficients believable?

Their website gives the BC at 0.405. Seems to better match some of the other .257 soft point boat tails.

http://www.speer-bullets.com/ballistics/detail.aspx?id=279

I'd go with the Speer number (0.405).

405 makes more sense but several people have called out speer on this very issue. Their btsp line seems to have optimistic bc listed sometimes.

The .405 BC mentioned above is for Speer’s 1411 Spitzer SP. The bullet that the OP is referring to from Midway is a different bullet, Speer 1410 Spitzer BTSP. Speer lists that bullet’s BC as 0.48, same as Midway.
http://www.speer-bullets.com/ballistics/detail.aspx?id=29

GooseGestapo wrote:
Anybody shot them at distance to verify this seeming exageration?

Click to expand...

The "Ballistic Coefficient" is not a static number that applies to a projectile at all times, conditions, and points in the flight envelope. Unless you know the velocity and conditions under which a particular projectile B.C. was measured and you know the B.C. of the projectile you are proposing to compare it with, B.C.s reported by one manufacturer may have limited comparability with B.C.s reported by another.

Ballistic coefficients are about the bullet's ability to move through the air. Has nothing to do with distance. Has to do with the weight and shape of the bullet. The BC doesn't really mean much anyway. You load according to the bullet weight, not how it moves through the air.

That seams a little optimistic to me. They list there 120 grain fusion bullet at .468 which I also have a hard time believing but they are an excellent bullet nonetheless.

The BC doesn't really mean much anyway. You load according to the bullet weight, not how it moves through the air.

Click to expand...

BC doesn't have anything to do with how you load, but that wasn't the question. And BC can be huge. A 180 gr bullet with a very high BC fired from a 30-06 will impact with more speed and energy at 100 yards than a 180 gr bullet with a very poor BC fired from a 300 WM. The same high BC bullet fired from a 308 will beat a poor BC bullet fired from a 300 WM at 200 yards. That means something.

BC does change as velocity changes. Some bullet manufacturers state BC at a specific speed, others at an average speed over a set distance. Some are more accurate than others. Berger tends to be pretty accurate with the numbers they state.