Open spring set up

[Dfehr401]

Do you prefer and snappy quick return to zero or a softer shooting pistol?

[zzt]

I want it as flat as possible, and as soft as can be achieved given limited 9mm case capacity.

[APL-G35]

I like a quick return and flat, I'm looking at minimal dot movement rather than how it "feels" in the hand.  Current setup is a 5.4 barrel 2x 3/16 popple with 2 port Binary comp.  Load is 9.9 gr of AA7 at 1.165 using a 7lb recoil and 15lb mainspring.  Gun is very flat in video and returns quick.

[shred]

Springs don't do much to change the feel of an Open gun.  The load (bullet weight, powder charge) is a much bigger part of it. 

 

I've shot several top Open shooters pistols over the years and rarely are they tuned for super-flatness.  The ones I've discussed it with prefer a little flip for shot calling.  We learned with the 9x25 Dillon that ultimate flatness was a fools errand.

  

 

 

 

[Dfehr401]

Im trying to set up my square deal b for 38 sc but not really able to figuring the whole set up out so ill leave it at 9mm and just buy 38 when its on sale or I find it.  Might be time for an upgrade if Im going to stick with it.  I was playing with springs because Im only shooting eley ammo right now.  I found some armscor that shoots real flat but im running low.

[zzt]

I do tune my Open guns with springs.  For.me.it makes a.difference.  10 lb. recoil, 18 lb. main spring and Cheesy std.radius fps.  9 lb. recoil and 17 lb. main spring in backup.  Same firing pin stop.  Both have.perfect.return to.zero.  My main gun has many,.many Moe rounds thru it.

 

Edited July 19, 2023 by zzt

[MikeBurgess]

my spring philosophy is

#1 Reliability, no mater what else it must run 100% the end no exceptions.

#2 Dot return, I want the dot to come back to the spot it left from, current gun this is a 8lb variable last gun was a 7lb variable, this is also dependent on grip, mainspring weight,  firing pin stop geometry, slide weight, comp, barrel holes, and load.

 

for reference I have been running 17lb main springs, I am planning to do some experiments with heavier springs and different geometry firing pin stops but haven't got to it yet.