Need load data for 40 SW lead 170 grain bullets

Good day folks, I want to use a coated bullets by (precision bullets) I have selected
the 170 grain bullets. The instructions from the manufacture says to use any lead
reloading data. I have the latest manual from Lyman 4th Edition cast bullets. It has
data for 175 grain bullets and I did not find any other lead data for 170 grain.
Is there a way I can "safely" use this 175 grain data for a 170 grain bullet?

From the Lyman manual
40 Smith and Wesson 175 grain bullet
Power Pistol 5.8 grains 873 fps 6.5 grains 996 fps

Lee data for XTP jacketed bullet 170 grain
Power Pistol 6.8 grains 1025 ftp 7.3 grains 1105fps

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