I have a load worked up for my 243. I am currently using 65 gr v-max but have ran low on bullets an I have 70 nosler b-tips on hand. Looked on websites and can not find more 65 gr v-max. Currently i am using Winchester large rifle primers and Hunter powder and only neck sizing the cases. How much difference would i have to make to reload with 70 b-tip if I only change the weight of the bullet and everything else is the same( primer,powder and only neck sizing cases). I know my OAL will be a bit longer but can i stay near the same grain in powder? Any info would help? Would it be better to just re-do my load tuning for the new bullet?