GeneBray

Over travel screw on trigger is my first guess.

No experience with S2 but 70+k through an SP01. The most accurate bullets from the pistol are: Hornady HAP 125 gr., 0.356" diameter. Don't think they are available any longer. Hornady HAP 125 gr., 0.355" diameter. Available sometimes and places but expensive. Not listed in Hornady's 9th, 10th, or 11th Edition. I surmise they are discontinued. 115 gr. HAP are listed in both manuals. Certain I've seen the 125s listed rarely since the 9th Edition was published. Precision Delta FMJ RN, .38 Super, 0.356" diameter. Will switch to PD HP or Zero HP when my current supply is gone. Zero 125 gr FMJ RN, 0.355" and their JHPs always shoot well in the pistol. I would not be surprised if any good quality JHP in 0.356" diameter didn't shoot well in your S2 The vast majority of the 70k rnd were Titegroup which is my preferred powder. Typical load is 3.9-4.07 grains. Extremely consistent at 129-131 PF. So much so, I set aside a 500 rnds of the last major run to use as chrono check ammo to verify proper chrono set up before testing new loads. I've shot a lot of other bullets both coated and jacketed but the above always shoot between out of my pistol. Prefer 124/125 gr bullets. 147 gr seem sluggish and 115s a hair to snappy. I do believe JHP shoot more accurately out of my SP01 than RN-FMJs. Think you would find the same if you want 147 gr bullets. But, I do realize no two pistols are identical even if they have sequential serial numbers. Part of the fun of shooting and reloading is finding what works best.

Ensure both legs of the trigger bar spring are properly seated into the slots on the trigger bar.

I did. Lightened FPB spring. Installed CGW reach reduction and short rest set kit. installed lighter hammer spring. I can feel the FPB during some dry fire drills, but never notice during USPSA/SCSA matches.

To me that doesn't seem correct. If every thing stays the same and you lighten the slide, the force exerted when fired remains the same and the forces to be overcome decrease and the mass moved is less. That means slide acceleration increases. Velocity is distance traveled divided by time. With faster acceleration and the distance traveled remaining the same, then velocity has to increase. Higher slide velocity may you need to increase the recoil spring weight. There are a lot of variable that come into play for the proper answer, but they all start with how much weight is removed. I know a lighter recoil spring in all my pistols results in brass being ejected further which is an indirect measurement of the slide velocity. The converse was also true -- the heavier the spring the close the brass ejected to me. Adding an optic to a production pistol required a lighter recoil spring to function. Until the recoil spring was lightened 1-2 lbs. or more there were frequent FTF. As the recoil spring was lightened, the FTF improved until the pistol cycled normally. Added: This mass and velocity which mean forces causes the muzzle flip since in most pistols the slide and barrel are above the hand(s). The above only discusses recoil. Assuming nothing changes but slide weight, when the slide stops and recoil spring starts pushing the slide forward the lower weight (meaning mass) of the slide will accelerate faster and to a higher speed then come to a fairly abrupt stop when the slides goes into battery. AKA muzzle dip. The control of muzzle flip and dip very shooter to shooter and, I think if studies with enough high speed video, may vary shot to shot. If you change the slide weight (i.e., mass), then the recoil spring may need to adjusted to the shooter preferences for how "snappy" the recoil feels, how much muzzle flip and dip the weight change made to the pistols behavior. There may be rules of thumb for which way to go. What I've discovered is make the change, shoot the firearm and see what happens. Then, if you decide you need to change the recoil spring, attempt to decide lighter or heavier. Change, and test. Note what you think worked best and then make changes in the other direction to see if like that better. Once you find what works, keep it make a records of the change(s), why, and you subjective, and objective reason(s) for making the change. If you change something else, then the process starts over again.

On a 1911, the recoil spring and main springs are compressed on recoil. Additionally, friction and inertia of the slide and hammer and its associated parts are over come, but IMO those forces are really too small to play much of a role in how the slide cycles. There is also the issue that the hammer spring is not directly loaded under recoil. There are some levers involved in the linkage of the hammer and strut to compress the hammer spring. It would take detailed drawing with measurements along with a refresher course in my physics classes from 55+ years ago to figure out how much force is applied to those parts. My guess is there is some mechanical advantage or disadvantage in the design. How much? No idea, but more or less than just the force needed to compress whatever pound spring is installed. Probably not significant with regard to the overall behavior of the slide. Except for a very small movement until the sear engages the hammer hooks, the hammer spring also affects the slide return to battery. How much? Very little IMO or less than that. What do those comments mean? The recoil spring is the primary force for returning the slide to battery. The hammer spring and recoil spring work together to control the rearward speed of the slide. Proper tuning of a 1911 to you as a shooter for a particular load (weight of bullet. bullet velocity, and powder brand and amount) may require changes both springs. I had an uncle (passed away years ago) who shot 1911s in bulls eye matches when in the Army during WW II and the Korean War. If my memory is correct, his competition pistol had one set of springs (hammer and recoil) for hard ball and another ofter wadcutters. I also believe separate barrels for both disciplines. Don't recall if he used separate hammer and sear wad cutters and hard ball or not. Would not surprise me if he did.

Think your comment is spot on. A typo on the #7 main spring? {Edit: Corrected "stop" to "spot". I can't proof read very well either.. }

Great news!!

Went through thread today. Any progress? How do shorter round feed? Another thought while reading the posts. Check she’ll plate on 1100 to ensure it is adjusted properly. If the lock screws aren’t thought enough and/or the polymer “pads” the screws push against the thread harden the shell plate may be out of proper adjustment.

Started this sport in 2000. One of the local competitors, a local LEO, shot primarily limited as I recall. High ride leather holster in the 9 o'clock position approximately and leather mag pouches on the opposite side. Made GM without difficultly. You are loosing at least 1 full second on your reload. You haven't mentioned draw time so guessing approximately another 1 second. For Trigger Freeze, the minimum CO GM HF is 15.2 from tonights classifier lookup. 120 divided by 15.2 is 7.89 seconds to shoot the stage with all As. If you are loosing 1 sec on a reload and ?? on a draw, you need to focus of faster draws and reloads. Your gear and placement and drawing from concealed are a hinderance. Shred's comment is spot on. You will not shoot Trigger Freeze very often. Most classifiers require one or more draws and/or reloads. There are 120 classifiers (if I can count correctly), and only 1 has 24 rounds and no specified reload, Next point, course design and construction must not require more than 8 scoring hits from any single location or view, nor allow a competitor to shoot all targets in the course of fire from any single location or view. You can shoot short and medium COF with 1 mag and 22+1. Long courses range from 21 to 32 (maybe longer for Level 11 & II matches), could require 1 reload and which is what is needed for 21 or 22+1 mags. Final point, IDPA and USPSA are two very different sports. If you want to shoot both, gear accordingly and learn to use both optimally. P.S. When 2 decades younger, one I took from a class from one of the best USPSA competitors at that time. We were doing 0.8 second turn and draw from wrists above shoulders with A hits on 7 or 8 yd targets. The instructor had us working down from 1.5 or so seconds, and when he hit 1.0 second continued to reduce par time w/o telling us. Amazing what you can do when you don't limit yourself. Sorry the final point wasn't.....

Dies to be cleaned occasionally. I would start there. Remove, disassemble clean, reassemble and test your COAL. Also, you have a mark 7 on the press don’t know what Dillon will if you call them. However, think they now selling Mark 7s. Suggest call Mark 7 first and if not better Dillon if no improvement.

Product optic mirror product rules very closely except for the sights and one or two and certainly the box rule for production

Product optic mirror product rules very closely except for the sights and one or two and certainly the box rule for production

You didn't say which division(s) you are considering. Assuming production/production optics. 1. r4ptor is correct IMO. Not permitted in Production/Production Optics 2. I would say okay assuming trigger pull weights are met. 16. The minimum trigger pull must either be 2.27kg (5lbs.) for the first shot fired and no restriction for subsequent shots fired, or 1.36kg (3lbs.) for every shot fired. 19. Aftermarket parts, components and accessories are prohibited, except as follows: 19.1 Aftermarket magazines are permitted, subject to 18.2 above. 19.2 Aftermarket open sights (see Rule 5.1.3.1) are permitted, provided their installation and/or adjustment requires no alteration to the handgun. 19.3 Aftermarket grip panels which match the profile and contours of the OFM standard or optional grip panels for the approved handgun and/or the application of tape on grips (see Appendix E3a) are permitted. However, rubber sleeves are prohibited. 19.4 Aftermarket springs are permitted, provided they are in the same configuration as original. 19.5 Aftermarket trigger assemblies are permitted, subject to 16 above. A trigger assembly is defined as a mechanism that, once the trigger is pulled, activates the firing sequence of a firearm. Note that, if the original trigger includes a trigger safety, then the aftermarket trigger must also include a trigger safety. 19.6 Aftermarket hammers are permitted. 3. Looked at Patriot Defense site at the grips you named. Cannot tell for certain. IMO they appear to be close enough to OFM to be allowed. Stress IMO. 4. No maximum weight that I see in the rules. MORE: From the IPSC Production List: CZ – CESKA ZBROJOVKA listed firearms. Allowed: Shadow 2. NOT APPROVED: CZ-USA and CZ Custom Shop variants (e.g. SP-01 Shadow Target, CZ 75 Shadow T, CZ 75 SP01 ACCU Shadow etc.) Models: P-10 F, P-10 C, P-10 M and P-10 SC. These 4 models in the Optics Ready (OR) version are also approved but in Production Division without the optics installed. IPSC did a far better job of controlling the Production divisions that USPSA did IMO. Production was intended to be an entry level division to bridge to others as skills developed--meaning Limited, Open. This no longer the case IMO,.

How did chrono fair at Nationals?

Case doesn't have to be full to be compressed. Compressed is a combination of powder volume, case volume, bullet length and seating depth. Any charge can be compressed if bullet is seated deep enough.

His mags are tuned. Based on all he's posted, my bet is on the COAL too long. Been there, done that, and didn't buy a t-shirt. Just filed away the information in my portable soft drive for future reference.

Google: Bullet Design And Feeding Reliability In Semi-Automatic Pistols by Brad Miller, Ph.D. and the update Bullet Design Update and Feeding - 2013 Update in the 2013 Guns & Ammo Annual. If you cannot find them, send me an email address and I'll send you the pdfs. I suspect you need to shorten the COAL. I run 124/125 at 1..12 - 1.14" and 115s shorter. I would load a series at 1.15" and step down 0.01" and test. Stop when/if feeding issues disappear. Or, since you have such a large variation in COAL measure what is loaded and sort by length. I load on a 1050 with range brass and don't see anywhere close to the variability you do in COAL. Are the bullets you use FMJ, plated, or coated? I use X-Treme plated and Precision Delta and FMJ or JHP for both, but mostly FMJ RN ATT. In the past I used Montana Gold (Won't buy from any longer due to major issue with a bulk order. Won't say more on this thread about the issue.), Zero, X-Treme, Hornady, Precision Delta, a small amount of Blue Bullets. Most accurate bullet out of my 9s was Hornady HAP with a 0.356" diameter. Unfortunately, think Hornady now only makes a 0.355" HAP. When I'm done with PD 124 gr RN in .38 Super (0.356") I will most likely switch to either a .38 Super JHP but will have to find a quality product at reasonable price.

Not certain COAL all different because of range brass. Assuming these are reloads, are you using using a progress press? What is your target COAL? Or average of say 10-20 rnds. Since you say all are different COAL do any feed correctly? If so what length? Longer or shorter of your target length?

Relatively easy convert several-many/most CZs that are DA/SA to SAO only. Don’t know what that conversion does to firing pin block but think it can remain or be removed.

Glad your well enough for a Nationals. Wish you well. I believe you said (or I saw you are in the Austin area. I'm in Bryan). Shoot Austin PS when I can. Getting older and slower. But, still want to shoot and love the challenge of trying to get better. Hope to see you at match someday in the future. Need to get cataracts taken care of so shooting mostly PCC now. Having issues for the first time in 24 years of competition with seeing iron sights the way I should. Looking at an elongated focal length lense tailored for med- to distance and use glasses as needed for reading/close work.

Loaded dummy rounds with 165 gr X-treme RN. COL 1.150". Plunk tested no issue in my 75 SP01s. Curious as to COL and bullet style, manufacturer, and jacketed/plated/lead/coated (i.e., Blue Bullets, et al) for the 147s that won't chamber in an S2.

Never reamed any of the barrels in my CZs and never any issues re feeding or chambering using bullets from 95 hrs to 147 so far -- Jacketed, plated, and coated and never straight lead. In the near future will experiment with >147. Curious to see what happens there. Just sayin' and know Everyone's MMV. {Edit: Added comment on jacketed....}

Based on your posts the pistol clearly fails the IPSC safety test. That assume I read your post correctly. If you did the replacement parts it’s going to be you who needs to fix it. Sounds like you already know the fix. Increase downward force on the trigger bar spring and then ensure that fixed the problem and didn’t create new ones.