metalgod you can verify the b/c on the Speer site. Also the midway site has info including the .520 published b/c.
I have used these projectiles for several years now. They're consistent,come in boxes of 100, are very effective for hunting and range work, fly great for a lead tipped projectile and sell for around $22 /23.00 per hundred. (2012 price). They just work for me. Tries and true to 600
Let us know your results.