DougGuy,
I have absolutely no idea the size of M69 throats,or groove diameter! If it ain’t broke don’t fix it. The Saeco 200gr/7gr/W-231 load is extremely accurate in 3 other 44mag. In FA97 44spl I drop down to 6grs and is equally accurate.
Interesting, the 200gr Saeco load and the Lyman 429-215gc/10gr Unique load poi is only about 1” different @50yds. I think the 429-215gc/10gr Unique load will be my field/ hunting load. Next week I shoot some over the chronograph.I’m guessing 1150fps.
BigeboreShooter