1st of all. Lyman Gun Sight Corporation - followed the #41 manual but does not have a date, although a photograph of Guy Lovern casting bullets.
No data for anything over 147 gr.
ALL loaded with Lyman 266469 mould
6.5x53R - 145gr. meduim - 15.0gr. Unique - for deer
6.5 Jap - 147gr. hard - 21gr. IMR4198--- for target
6.5x55 -- 140gr. medium 34.0gr. 3031 --- Varmint
6.5x55 -- 140gr. medium 45.0gr. 4350 --- Deer
6.5mm? -- 145gr. medium 15.0gr. 3031 --- Target

Lyman #45 1970 - same mould

6.5x54 - Custom Mauser 20" bl. 1 in 7 1/2". Norma brass.[/
b]

143gr. #2 alloy - brinel 16.

IMR4227 - 13.0gr. - 1,382fps - 21.0gr. - 1,953fps
IMR4198 - 16.0gr. - 1,510fps - 22.0gr. - 1,918fps
IMR4895 - 19.0gr. - 1,400fps - 30.0gr. - 2,132fps

Note, with 160gr. Jacketed,
starting loads.
with 4895 - 30.0gr. - 1,960fps
with 3031 - 28.0gr. - 1,908fps
with 4064 - 31.0gr. - 1,912fps

Should be easy to extrapolate a load from these starting loads. I would cut these loads by 5gr. or 6 gr. and test with the 160gr. Gas Check, hard bullet.

Hope this helps.