Which Factory?
Another 2 and a half year old thread brought back from the Abyss!
Ed, why not start a new thread instead of bringing back such old threads?
He probably got yelled at (if it was by me - sorry, bad day!

) for not researching old threads before asking questions
I find the term "factory load" intriguing. According to my 1970 Lyman (45th ed.) the preamble describes it thus:
FACTORY DUPLICATION LOAD: Where possible, we have listed the load which duplicated factory velocity for the bullet weight tested. It should not be assumed that this weight duplicates factory pressure....
In the .38 Special section:
...Bullet No. 358311 duplicates the factory 158 grain service bullet very closely.
In the data tables:
...Factory Duplication Load:
Bullseye Powder, 3.5 grains, 826 f.p.s.
In the above case, the gun used was a S&W M14 with a 6" barrel.
The primers were Remington 1-1/2 and the cases also Remington.