sounds like you need a load for 200 yds.
If you go to the Powerbelt site there is trajectory charts for loads and bullet weights.
Assuming you want around 1000 foot pounds at the 200 yard range and I would think the platinum 270 pushed by at least 2 X 50 grain pellets of Triple Seven will equal 901. Zeroed at 150 yards will give you a high point of 3.4 inches out to 150 yds and a drop of 8 inches at 200 yds
3 pellets =1257 ft pounds, a mid point rise of 2.2 inches and a drop of 5 inches at 200
Under 100 yds using your 150 yd zero still using your 270 platinum plus 2 X 50 grain pellets will give you mid range rise of 3.6 inches
Maybe a load of 130 grains (2X50 plus 1X30) might be a comprise.
Practice, practice, practice until loading becomes an automatic action
montveil in the NC mountains
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