it's not clear what you're doing
1/7 is a twist typically used in AR15s and whatnot with 55/62/75+ grain military-style FMJ and OTM bullets
varmint bullets like NCsmitty mentioned come in 50g and 55g (and 52, 45, and smaller) but are usually used with much slower twists, like 1/12
1/7 and 55g combo is fine for hitting steel and silhouette sized targets at 300-400, but it would likely be a little frustrating trying to hit a p-dog at that range with that combo, so you'd be better off with a typical varmint setup