I was just reading and saw Hornady 75 BTHP BC = 0.395.
Sierra 77 SMK BC = 0.362.
Is this right?  The lighter weight Hornady better then Sierra.  Let me know what you think.

Stone

It's right.

Shape makes a difference.

 

Sir, as the others have said the BC's published on the respective manufacturers web site are what their makers claim.  There may be some differences if one had the capability to actually measure and calculate the BC of the two bullets at various distances.  I find it interesting that Hornady publishes only one BC for their bullet presumably regardless of MV, yet Sierra publishes a BC for MV above 3K fps, and a different BC for slower velocities.  Sierra qualifies the BC for their bullet that you mention as being between 1800 and 3K fps.  They show a higher BC, ie:  .372 for velocities above 3K fps.  For the purposes of service rifle shooters I do not believe it is practical to achieve an MV above 3K fps with this bullet so for practical purposes .362 is the BC of the Sierra bullet.  Keep in mind that these are G1 BCs vs. G7 BSs as distinguished by the new book by Brian Litz.

For my purposes after I've completed all the chronograph testing I intend to do at the end of the day what really counts is group size and terminal velocity.  Since I don't use either bullet beyond three hundred yards the difference in BC for my purposes is insignificant.  I use 80gr VLD bullets for longer distance service rifle shooting.  HTH, 7zero1.

The BC's of both these bullets are close enough not to matter for their intended purpose, 200/300 yard NRA/CMP match loads. Find which one of the big three (or four if you're willing to pony up for Berger's 73) shoots best in your rifle and don't be concerned about a .25 difference. Smaller groups beat higher BC's anyday as long as they're relatively close.

Yeah at 300 it may not matter but how about at 600 or 800?  You are seeing these bullets used ALOT in long range comps mag fed.  Of the 19 at the shoot I just went to 3 of us were using the 75 bthp mag fed.

Sir, given the lower terminal velocity in part due to the lower BC either of these bullets is a poor choice for shooting at 600yd or greater when compared to the 80gr SMK or VLDs.  I can't give you the exact numbers right now because I can't run my ballistics program from my work station but believe me the terminal velocity of the 75s and 77s at 600yd is significantly lower!  HTH, 7zero1.