Tropical Lion's Tail

1/2 oz Jamaican Rum
1/4 oz Overproof Rum
3/4 oz Bourbon
< 1/4 oz Allspice Dram
3/4 oz Lime Juice
1/4 oz Pineapple Juice
1/4 oz Simple Syrup
1 Dash Angostura Bitters

Shaken