You need a gunsmith
380 aka 9mm Kurz ammuntion only. BTW, the 380 and 9mm use the same size projectile. Difference is the case length.
This question is to vague to answer. Equivalent to what size "what"? 38C is 38C.
100F/38C Should not exceed 100F/38C
Your 38C Combat is a replica of a S&W 38. There were 2 variations made. It was manufactured sometime between 1973 and 1981. The value can not be determined because you have not stated the condition of the pistol.
38DD
What condition is the pistol in. Is it working? Is it in Poor, Fair, Good, Very good or Excellent condition? without more information I can not give you an estimate of value. It is in fair condition. In Fair condition it is worth $25 - $40. They were made in 3 different variations from 1964-1981. Model 38C (Combat) The owners and parts manual is still available on Crosman's home page.
36D
The answer depends on what the 38 is a measure of!
38c
38c
38c
1st Varient 38c (Combat) 3.5in barrel 95%=$75 (1964-1973)