Speaking of head-space off the neck......I turned the belts down to .215 and set the belt head-space to .217 instead of the standard .220. I checked about 100 belts and found they run up-to .005 under......that is how I came up with the .215.
Opening day for whitetail here in MI.......and I just added a 8pt. to the list of one shot kills with the .41..........100yd shot, quartering away............broke the far shoulder but did not exit.......300 grain Hornady SP at 2100 fps [muzzle]..........bullet recovery tomorrow!
The reason to go with a .411 is the cost of bullets....................Midway has Blems for $11 per box...........$16-19 reg price. Use 41 cal pistol bullet for plinkers, just slow them down to 2100fps and the shoot fair. I also have shot Hawk bullets........the 300 .035 jacket shoot great...............but cost $36 for 50. No custom dies, just use .405 Win.
Most 416 ammo is made for higher velocity.....................you might get 2300 with a 300 grain in a 22" barrel........I have shot .416 with 300 grain Hawks and a .035 jacket out of my custom 40-90 at 2500fps with superb accuracy......[three shots under 1/4"] at 100 yds from the bench.....................$37 a box...........If you load longer bullets, the powder capacity goes down.
The key is to find a the right bullet.
http://www.hawkbullets.com/