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. Give him your case and bullet details and he will provide you with load data. It is Min~Max data since we don't regard "accurate loads" as being genuine since each rifle is likely to shoot best with a load that is tuned for that rifle rather than a load that worked best in another rifle. They work sometimes but not often enough for us to list them.
This is a good question. First it is important to clarify that the ogive shape for the 7mm 140 gr VLD and the 168 gr VLD are not the same. Since they are not the same you will have different jump (or jam) if you don't change your seating die.
Now let's assume that you knew that fact and were asking that if one VLD bullet has a sweet spot of .075 jump (for example) will another VLD bullet also shoot well at .075. Frankly, I don't know. The fact that the ogive shape is different and the weight is different suggests that it won't shoot the same (I expect your powder charge will be different as well) but I can't say for sure that it will be different.
Another aspect of this question to consider is that what happens when you switch between bullet weights that have the same ogive shape like the 7mm 168 gr VLD and 180 gr VLD. Both of these bullets have the same ogive shape. Will these bullets have the same sweet spot? Again, unfortunatley, I don't know.
If it were me, I'd certainly start with the same jump (or jam) to see if the sweet spot is the same for both bullets. If it is then your tuning is done (and please post the results as I am curious myself). If it isn't the same sweet spot then you know exactly what to do to find the sweet spot for the other bullet.