That 75 gr. .257 caliber bullet sounds like an obsolete
X bullet. I shoot 25-06, with Barnes, and as I recall
when I started, there were only 100 gr. and 115, or 120, gr.
offerings, that I saw available. Or at least that is my
recollection. You might consult an older Barnes load data
manual, or give Barnes a call.
On the topic of Triple Shocks, to add to the previous post,
I shoot 130 gr. TSX's in my 308 Win chambered Savage
Striker(bolt action pistol), and it blows big holes through
northern Whitetails. I drive these at 2800 fps, out of a
14" barrel(chrony'ed average), and they are lightning in
a 130 gr. dose. According to my old uncle, that visited
while I was processing a doe, shot quartering towards, with
one, it is too much gun/bullet for whitetail. He was
making that comment, looking at a 4" entrance hole on
the front side shoulder. He didn't see the exit side /ubbthreads/images/graemlins/grin.gif
I use to shoot 150 gr. soft points, and yes they kill deer,
but these TSX's do it with so much more shock and awe, that
I can't help but pay the extra for them /ubbthreads/images/graemlins/crazy.gif
Squeeze