Accubond, Balistic Tip, CT Balistic Sylvertip - LENGTH vs BC

[300SaUltraMag]

I don't understand something... And here, we are some reloaders who don't understand...

Here is the Length of the bullets...

180gr AccuBond: 1.388"
180gr Balistic SylverTip: 1.368"
180gr Balistic Tip: 1.342"

And According Nosler, each bullet have a Ballistic Coeficient of .507... How it is possible to get the same BC, with 3 bullet of 180gr of different length ?

Is it only the AccuBond that get .507 and Nosler tell us the same thing for the others ?

 

[FOTIS]

The AccuBond is a little longer due to the jacket being thicker. So since lead is denser than copper it must be a little longer. As far as the Ballistic Silvertip maybe the coating...not sure. Now the BC is so close between the three I consider it negligible. I mean maybe .507 vs .507.456? :lol:
Heck at long range who can actually hold straight enough to prove the drift or drop? :wink:


BTW welcome to the forum ....If I have not done so already. Glad to have you.

 

[300SaUltraMag]

The AccuBond is a little longer due to the jacket being thicker. So since lead is denser than copper it must be a little longer. As far as the Ballistic Silvertip maybe the coating...not sure. Now the BC is so close between the three I consider it negligible. I mean maybe .507 vs .507.456? :lol:
Heck at long range who can actually hold straight enough to prove the drift or drop? :wink:


BTW welcome to the forum ....If I have not done so already. Glad to have you.

Thanks again POP... Yes you already told me welcome, when I asked for 300SAUM Quickload data for a Nosler AccuBond 200gr... But I'll take it again... Thanks again. Always really interesting to read your comments...

And again, Sorry for my bad english, I'm from Quebec and I speak more French than English...

 

[Desert Fox]

And According Nosler, each bullet have a Ballistic Coeficient of .507... How it is possible to get the same BC, with 3 bullet of 180gr of different length ?

B.C is not question of bullet lenght but it's ability to overcome the wind resistance as it travel downrange. The three bullet you've mention although of varying lenght can have the same B.C due to fact that the number is only an approximate... They're not written in stone. Lot's of variables can affect bullet flight and so are B.C numbers. Sierra list 3 B.C number on their bullet for these very reason. You can fire two identical bullet of the same caliber but on different rifle and your B.C won't be the same. Change the atmospheric condition or the elevation and your B.C will change. So don't dwell on the little things! Just shoot :grin: And yeah, Welcome aboard.

 

[JD338]

300SaUltraMag

Welcome to the forum.

Desert Fox is spot on. Temperature, elevation and velocity will all effect the BC of a bullet.

JD338

 

[tpbscha]

Are the boat tail dimensions the same? Also, the shape of the bullet from the tip to the actual bearing surface may be slightly different. Even the length of the bearing surface can influence the BC.

 

[JD338]

Are the boat tail dimensions the same? Also, the shape of the bullet from the tip to the actual bearing surface may be slightly different. Even the length of the bearing surface can influence the BC.

The Boat Tail dimensions are the same.

JD338