Recoil spring for double taps

[BillC523]

  What recoil spring do you find most helpful in shooting double taps with a PCR, assuming the use of winchester/Remington 115 gr. factory ammo?

Let me paint an action picture!  When you fire two rapid shots in succession, where does the second round hit relative to the first shot?
Second question: Does the front sight dip out of view momentarily when the slide returns to battery, or has the choice of recoil spring eliminated that problem?  Can someone help me out here.

Bill

[NVCZ]

All I can tell you is that I run factory springs in my PCR, And during double tap practice, it is just that, practice.

Where do rounds place themselves? Often 2nd tap hits about 2" at 11o'clock to first round.

Full mag of double taps will give me a grouping of about 4" at 15'-21'

NVCZ