For the last 15 or 20 years I've been shooting my Andy Cannon tuned 5" 625 .45acp in local practical pistol matches. My pet load has been a 230 grn RN with 4 grains of Bullseye. A couple years ago I bought a 4" 610 and would like to try that out in an upcoming match. The problem is that all the load data I find for 10mm is for relatively fast loads in the 1100 fps range or so. I've got 500 180 grain lead flat points and I'm thinking of trying 3.5 grains of Bullseye and see what happens. I just want a light plinking load that won't recoil a whole lot for quick recovery between shots. I figure someone on here has probably been down this road and I'm curious what you found out!
Thanks in advance for you input............
Mike

I have used 3.6 to 4.4 grains of Bullseye and 4.1 to 5.0 grains of Win 231 with a similar bullet weight (175 grain LSWC) for a velocity range of 830 to 980 fps. YMMV

All my 10s are autos so I have to load them warm enough to function. However I do shoot a lot of .41 magnums with Bullseye and think you are pretty good to go with your choice.