Love my long-throated .257 Roberts with +P loads and brass.
3609fps with 75g V-MAX and H4895
3233fps with 100g TTSX and H4350
3163fps with 110g AB and H4350
2947fps with 120g A-Frame and H4831SC
Too bad it doesn't shoot well.
Don't shoot for groups much anymore but I was dancing bullets just off the edges of clay pigeons with it at 600 yards last weekend.