I might have mentioned it before but I am not going to look. The thread is up to 7 pages. Water drop WW boolits and let them sit a week before measuring. Avoid measuring fresh boolits.
It may be best with .001 or .002" over groove but I have shot thousands and thousands right at groove size That makes it hard for me to define and in a revolver I shoot .0024" under throats and can't tell a difference if I get closer.
Some things that don't make sense can work and the biggest problems have been boolits UNDER groove.
If you can at least match the groove size, try them.
The right mold temps and aging just might bring get them to fit the larger bore.
I cast all my boolits with the pot at 750° and never fool with it. The cadence takes care of all else.
I have a funny thing and have been the center of jokes. I let the sprues just set, hang my mold down and swing it back and forth. Even that time changes a little each pour, sometimes four swings and another five swings. I cut with a hunk of wood with tiny taps on the plate and if it chunks out with the first tap, I slow a little more. I like to see a bunch of half circles nice and clean at the cut. I don't reject any boolits with a chunked out sprue, just small things that do no harm. I never want a lump on the bottom though. Adjust the plate and use a slight downward tap.
Soon you will not even think and is when you need to read a book while you cast or have dancing girls and a pole on your bench!
I don't enjoy casting or trimming 1000 cases, too darn boring!