Spaniel,

I typically see around 100 to 125fps difference using the same powder load for the 250 and 300 SW's so I think his comparison is about right. Also when using his numbers in my ballistic calculator I show that at 300 yards the 250 drops 4 inches further than the 300 indicating the 300 shoots flatter at extended range than the 250. This is due to the higher BC which allows the bullet to maintain velocity better than the 250. You would have to push the 250 to about 2000fps to match the drop at 300 yards of the 300gr bullet. The 300 will still have over 200fp energy advantageat 300 yards even pushing the 250 at 2000fps.

Theres not enough trajectory difference between the two to make up for the energy gain you get from the heavier bullet to justify the lighter one in my opinion. That is why I also prefer the heavier bullets. I do like the 200SW though because it has a high BC and retains energy much better than the 250.