Lord a Mighty where you and your Dad been!!! Best semi-auto pistol round ever and you just bought one.... ;-)
Being SuperMan...I'm the Man of Many Supers, not the other guy...
I also got intrigued with the .38 Super back in the late 1960s after reading several articles about the round but it wasn't till 1980 that I bought my first two about a week apart...an unfired 1969 SUPER .38 and a 1952 Commander. Have carried one of two 1952 Commanders just about daily ever since...
The original Colt made 1911s had a chamber that headspaced the round on the case rim not the case mouth like Colt did with the .45 ACP. This was a holdover from the way the 1903 Model was headspaced. In 1929 when Colt introduced the SUPER .38 1911 the round it shot was the .38 ACP...there was no such cartridge as a .38 Super. Short story is there ended up being the .38 ACP and the .38 Super because the hot rodded .38 ACP rounds that Remington made up beat the 1903s to death just like a .38-44 with beat up a J-Frame. Unfortunately the headspacing on the case rim lead to headspace and accuracy problems that were not solved till the late 1960s.
My two first guns were a train wreck...at 50 yards the SUPER .38 ran 3'...that is FEET groups and the Commander 18". Fortunately another member here I used to work with way back when had read a HANDLOADER MAGAZINE article describing the problem and a cure...a BarSto barrel...and the groups from the same box of ammo went to 3" for the SUPER .38 and 3.5" for the Commander. Colt did not correct the problem till 1990. No other manufacturer ever used the headspace on the case rim chamber style and most guns are superbly accurate...
Some good reading....
38 Super
Corbon
How Does
Four-Caliber STII... | 1911Forum
Trail gun perfection: Kimber's .38 super stainless target II. - Free Online Library
https://www.shootingtimes.com/editorial/super-powders-for-the-38-super/99160
https://www.shootingtimes.com/editorial/super-accurate-38-super-loads/326242
...my #1 semi-auto round...the .41 being my favorite revolver round...
Bob
1952 Commander carried from 1980-2007
1952 Commander carried from 2007 till today
1969 SUPER .38 that was my first Super...