The general rule is 70gr max with the 1-14" but unfortunately that really doesnt leave you with many harder deer suitable bullets at .243 speeds. Most 70gr are light jacketed and explosive varmint bullets but I have recently found the Sierra 75gr HP Varminter a great bullet in the 1-14" twist and they have heavier jackets to deal with a bit more velocity.
For those ranges on deer personally Id load the 75gr to mag length at 2900- 3000fps for the best bullet terminal performance and use 34 to 34.5gr of ADI 2206H in that shorter barrel for a better burn with a reduced load.
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