I am confused.

For a 158 grain lead SWC Accurate shows a starting load of 9.1g and a max of 10.1 as follows
"158 (L) LC SWC 9.1 1,041 / 10.1 1,183 33,228 1.580"

Lyman 49th edition shows doesn't have a 158 grain, but it goes have a 155 grain which I would think would at least be close, but it shows:

"155 (L) SWC 10.8 893 28,300 / 12.0 1146 41,300"

How in the world can the be that far apart?