Isnt the internal volume of those bullet strainers too low? Flow rates through a low volume tube like that would be too high to allow for phase seperation, wouldnt they?
Actually the volume is quite large as compared to the ID of a 3/16" od tube that feeds it, in fact my Bullet Strainer Phase Separators are probably 4-5 times the volume of what Polycold used on their P-100 and PGC-100 product lines for the upper phase separators. So what did they use? Believe it or not, a 5/16" copper tee, angled downward with the side port passing gas, and the bottom port passing the liquid. When you get into the upper separation points, the volume of refrigerant is considerably less than what you see in the first stage (hence the larger size of the 1st separator as depicted on the piping diagram, and the larger flow of the 1st captube).

Believe me, the bullet strainers will do just fine as phase separators