Spring weights....

[BGlas]

With less hammer weight, the hammer cocks back easier, allowing the slide to come back quicker as it cocks the hammer. Which allows for more recoil allowing for more muzzle rise and more slamming. Springs are a system that work together. I haven't put enough rounds down range yet to  play with this in my CZ's yet but will look into it.
  Wow, that was a mouth full[emoji2] hope I explained it right. [emoji6]

That may sound good in theory but that's not how it works in real life testing.  Increasing recoil spring weight makes the slide slam forward more violently which increases your recovery time.

There is plenty of good reason why competitive shooters who use CZs in USPSA and IDPA reduce the strength of both springs to end up with a more shootable (i.e. faster) pistol.  And no, loads are not bunny fart reloads.  You have to make at least 125 power factor (bullet weight x muzzle velocity).

Yes, lighter springs = faster slide movement = gun is ready to go faster.  This is needed for competitive shooters as their bodies are tuned (through practice) to be fast enough that they need the gun to cycle as fast as it can.  It's also harder on the gun (slide stop, etc.) and brass typically flies a good distance.  I'm not anywhere near needing the gun to be that fast.  I like the heavier spring to impart more recoil early in the cycle and slow down the slide.  Less muzzle rise, more dive fits how I can recover for follow up shots right now at my skill level. Some day I may have the time to practice enough to need the lighter springs for faster cycles, but that's not today. 

Just trying to describe the thought process I went through to determine what works for me.  The spring weights are like holsters, each shooter needs to find what works well for them at their skill level.

[viking499]

Maybe I just need to stick with all my stock springs since I do not shoot any competitions.

[Firemanjones]

I do not shoot completion, my carry guns have 13# and my target ( 75 BD 8.5# & P-09 13#) which are the comparable to the guns and completion springs.

[Alpha Sierra]

I have a Pro Package 75D Compact (P01) from CGW.  They changed the recoil spring to #14.  I shot several hundred with this spring before replacing with the factory #17.

I shoot with better accuracy using the #17.

What are your splits?

[amada8]

New shooter (Sept14) From 7 yards standing, two hand hold no rest, 2-3 sec timing between shots.

#14 CGW was ALL low by two inches and maybe 6"-8" spread.  And I mean EVERYThing was low that I shot with the #14.

#17 Factory...at least correct height and 4"-5".  On border or in the black on a 4" center

Not sure why the RS would impact where they clustered height-wise...but they did for me.  Only had two hundred through with the #17 though so maybe the next few hundred will tell a different tale.  Starting to get into the cold weather here in ID so may be awhile before I get back out to the range.

[Canuck44]

Maybe I just need to stick with all my stock springs since I do not shoot any competitions.

forget about the competition factor a 13# mainspring will certainly make for a nicer trigger and better DA shooting.  It is a <$5.00 trigger job.

Take Care

Bob

[Tok36]

I have a Pro Package 75D Compact (P01) from CGW.  They changed the recoil spring to #14.  I shot several hundred with this spring before replacing with the factory #17.

I shoot with better accuracy using the #17.

What are your splits?

I cannot even do the splits. 

[CZTom]

After putting a 13# CGW hammer spring with the CGW extended firing pin, I NEEDED to go to a 20# recoil spring (from Wolff)  in my P-01 and to a 22# recoil spring (Wolff) in my P-06.  With the stock P-01 recoil spring, the accuracy was terrible until increasing the recoil spring.  I first tried a factory new spring (no help), then a Wolff 18# recoil spring (a slight improvement), then a return to the original accuracy of the P-01 after I installed the Wolff 20# recoil spring.

With my P-06, the spent casings were being ejected over 20 feet.  When I installed the 22# recoil spring from Wolff, that ejection distance reduced to about 10-12 feet, and functioned perfectly.  The Wolff Spring website, recommends installing a heavier recoil spring first, and if the pistol fails to function correctly, then install the next weaker recoil spring, continuing until proper functioning is achieved.  They also state the optimum ejection distance is about 8 feet, as I remember, but I think 10-12 is okay also, JMHO.  Hope this helps.

[BDG]

I have a Pro Package 75D Compact (P01) from CGW.  They changed the recoil spring to #14.  I shot several hundred with this spring before replacing with the factory #17.

I shoot with better accuracy using the #17.

What are your splits?

I cannot even do the splits. 

LMAO

[Canuck44]

CZTom What role does the mainspring aka hammer spring have as it relates to accuracy?  Just asking because I don't see the connection that a heavier mainspring aka hammer spring would be.  For me a lighter mainspring makes for a lighter trigger pull.  I ma not sure I would notice the difference in slide timing between a 13# main spring aka hammer spring and a heaver one.

Take Care

Bob

[CZTom]

Quote: "CZTom What role does the mainspring aka hammer spring have as it relates to accuracy?  Just asking because I don't see the connection that a heavier mainspring aka hammer spring would be.  For me a  lighter mainspring makes for a lighter trigger pull.  I am not sure I would notice the difference in slide timing between a 13# main spring aka hammer spring and a heaver one."

I am not sure I know why.  I just know that the group spread was excessive with the lighter recoil spring, and tightened up nicely after only installing the heavier recoil spring, using the same samples of ammo, from the same boxes.  I tried Winchester, Hornady, S&B, Federal, Remington, Blazer Brass, and Magtech.  All this was after installing the lighter hammerspring.  Shooting was done at 21 feet from a two-hand hold on a sand bag, slow fire.  Groups of 10 rounds went from 4-5 inch group spread to 2 inch group spread.  That is the best I can do with my older eyes/glasses.
The accuracy difference may have something to do with a tighter slide to barrel "lock-up" caused by the stronger recoil spring.  But, that is just my guess.

[Canuck44]

We are talking about two different springs.  I never have replaced the factory recoil spring in my guns.  Some of the guys do but I never have bothered.  The hammer spring is the one I replace just to reduce the trigger pull.   I find it makes for a much easier DA pull.

A heavier recoil spring should bring the gun back on target faster as the slide slams forward causing the muzzle to come down from recoil faster.  That may account for some of your accuracy improvement.

Take care

Bob

[BDG]

I am running 13# Main and 15# Recoil springs on my CGW PRO P-01 and 13# Main and 14# Recoil springs on my CGW PRO SP-01 with zero issues to date.
Pull weights:
P-01 DA 6.25#'s, DC 6#'s, SA 2.5#'s
SP-01 DA 6.50#'s, DC 6.25#'s, SA 2.75 lbs

P.S. The 13# Main springs are from CGW and the Recoil springs are from CZC. The Main springs came with the CGW PRO Kit's.

[Lemming]

This is an interesting topic. Most competition shooters do recommend lighter recoil springs for quicker follow up shots.

However I've just changed the recoil spring in my tactical sports from the stock 15 pound spring to a heavier 18 pound spring.

With the stock spring the muzzle was taking too long to come down out of recoil. With the heavier spring it comes back to point of aim more quickly. My splits instantly dropped from 0,5 seconds down to 0,35 - 0,4 seconds.

It works for me.....

After shooting for a while with the new spring,  I'll do another test and see if the results change.

By the way, I agree that a 13 pound hammer spring is one of the best things you can do to a cz 75 - it really improves the double action trigger pull

[Canuck44]

We should remember, depending on the discipline both IPSC/USPSA and IDPA only require 125PF out of their 9MM guns for Production and SSP/ESP Divisions.  Not light loads but not heavy either.  The top shooters have Popeye forearms and watching them shoot the gun hardly rises.  I can see where they are more interested in increasing the speed of the slide with a light recoil spring and not worrying about muzzle rise, something most of us cannot hold down near as well as they can.  Bob Vogel's muscle tone would make a Greek God blush with envy.  From where I sit most of the shooters I shoot with have something less than Greek God bodies.  I think I did 40 years ago my memory isn't so good, photos lie and a lot has slud south since those heady days of a 28 inch waist.

Take Care

Bob