The gun works. You've already proved it with the factory loads.The old Remington 22-250 brass was trashed. It hurts my heart but it needed to go. Made a dummy round that closed with a snap. Loaded up twenty rounds using 50gr. Hornady bullets and 34 grains of H-4885. The Winchester cases were sized on the Lee dies and loaded with the Lee seating die. Case mouths were evened up with a Lee trimmer and champhered with a Wilson deburring tool. I used a new Simmons 3-9x50 scope mounted using Burris Z rings. I"ll need to leave the hammer extension in place. There no way to cock that gun with that scope mounted. That scope will go if the gun works. Scope was a gift.
As to the receiver the numbers match with the 22-250 barrel.