I do not have a 10mm, but I shot one once...
I do have an AMT Longslide Hardballer 45acp with 7" barrel that I shoot 270s from Hunter's Supply in.
To figure out how long of a bullet the 10mm case will accept,
take a bullet, measure the length,
seat it normally in an unprimed case and measure the outside of the case.
Remove the barrel from the gun and do a plunk test to ensure that the test round will chamber freely.
Next start seating the bullet deeper and deeper while measuring the outside of the case until it starts to bulge.
Now measure the length and use this to calculate the max shank depth.
Take you max loaded length subtract the case length and add the max shank depth.
This will give you the maximum bullet length.
Now go to
www.mountainmolds.com and use his bullet design software to see what your max bullet will weigh.
The next step would be to take your bullet length, weight and loaded length and plug that into quickload.
Try several different powder burn rates until you get what you are looking for.
If you get the bullet length and weight, I would be more than happy to plug it into Quickload.