Oh wow... that 2.250 stuff has "Canon parts" written all over it .
One thing to consider if your going to buy some, 4140 bar is sold both in hardened or annealed form (Chrome-Molly gun barrel blanks) and no mention of which in the add...they are a very different breed of cat to the hobby machinist...Commercial machinist have a better chance of having adequate machining equipment/cutters than we do LOL.