Well, I took the Spencer down to the range this morning and learned a few more things. I should first say that the little rod on the follower was keeping the cartridges limited to 5 so I removed it. Now the magazine will hold 7. But for now this is a moot point because I don't use the spring or follower , as mentioned. I fired 50 rounds of JIM 513350 today and they cycled perfectly with the method I described above...no spring, just tilt, shake, and chamber a cartridge. The forked cartridge guide has excellent tension and presses down on the block in any rifle position. I had loaded up a few cut down Lee 450g. bullets with an OAL of 1.654, they have the WORST jamming tendency, it seems shorter is better. Again, the ejector stabs into the bullet tip when the gun jams. The magazine spring pushed the cartridges into it. A good sign occured during the chambering of the last 7 rounds, they didn't want to fall into the chamber with just gravity, I had to bang on the but of the gun to get them to fall in. Maybe the magazine spring will be necessary in the near future...I hope.
On a more positive side, the carbine is quite accurate, since I filed the rear sight as per Two Flints instructions...3" groups at 50 yds. I am using 22g. of 4227 with CCI magnum primers. Much blowback, I guess I'll have to anneal the Starlines, darn. Any more suggestions would be more than welcome. Thank you for all this kind attention for a new guy.