Re: .257 Weatherby Magnum - Bullet selection
Ballistic Tips and high velocity impacts have resulted in unfavorable terminal performance for many shooters. I don't hold that against Nosler because the Ballistic Tips were (reportedly) designed for longer ranges where impact velocities would be lower. They also perform well in standard cartridges where impact velocities would not exceed 3,000 ft/sec.
I shot 140gr B-Tips @ 3,500ft/sec out of my 7STW, knowing full well that this was outside the apparent design parameters for this bullet, at least where target range was short. The performance on whitetails was VERY unpredictable. Some would drop like a bomb went off inside of them while others ran while displaying huge surface wounds.
I switched to the Accubonds as soon as they became available and couldn't be happier with the results. The 140gr & 160gr both shoot accurately from my 7STW and 7mm-08. Terminal performance is reliable and predictable.
If I were you I'd shoot the Accubond or a similar premium bullet out of that speedster. I've also had good results with the (pricey) Barnes TSX for whatever that's worth.
Just my 2 cents.