The CZickness XIII: Lucky 13, we could all use some.

[88E30M50]

Nadscott posted an interesting article regarding bullet design and twist rate over in a different thread. It discusses bullet stabilization and how the length of the bullet impacts the need for higher rotational speeds as bullet length increases. It has me wondering what CZ optimizes their barrels for. Given the issues discussed above with the 147g ammo and the traditionally short chambers in CZs, I'm guessing that they are optimized for 124 to 115 grain bullets.

This might be another opportunity for CM and I to don the lab coats, put a bandaid on the bridge of our safety glasses and break out the slide rules. Or, maybe I could just play with various loads and see what seems inherently more accurate. This is the article Nadscott linked: http://www.schuemann.com/Portals/0/Documentation/Webfile_Barrel_Twist_Rate.pdf

 

[88E30M50]

I just ordered a bunch of CZ springs from Wolff Co. I'm going to take another shot at tuning the problem child 75B Compact in .40. This time I'm going to increase the hammer spring weight in an attempt to reduce the slide velocity. This, along with in increase in the recoil spring will not result in the beautiful trigger that we know and love, but it might just make it reliable. We'll see...

I also ordered a 10 pack of extra power extractor springs. I don't need any right now, but like having stuff like that on hand. If anyone needs one, let me know as I'll have plenty of spares to share. I ordered another 3 extra power mag springs for a compact which will let me do the last of the compact .40 mags. If that puppy does not run after that, I might just turn it into a hood ornament.

 

[TWEAKD4]

I have been reading up on CZ reloading and many stay away from 147g. From the CZ board the largest usually brecommended is 135g. If you check the OAL of the 147 round it may explain the problem. Some CZ chambers can accept longer OAL than others and the shape of the bullet plays a big part of the success. See post three in this thread. Reloading For CZ 75 B Omega

 

[KJQ6945]

If CZ is gonna market a "suppressor ready" pistol, they should have sorted out the ammo issue. With 147gr being the standard for subsonic 9mm, the pistol should be designed to run it. Just my thoughts.

i have not had any issue with the bullet failing to go into battery, so I think CZ has solved the short chamber issue on this particular gun. The failure to feed I think, is more a combination of bullet shape, ramp design, and recoil spring weight.

 

[maansmit]

If CZ is gonna market a "suppressor ready" pistol, they should have sorted out the ammo issue. With 147gr being the standard for subsonic 9mm, the pistol should be designed to run it. Just my thoughts.

i have not had any issue with the bullet failing to go into battery, so I think CZ has solved the short chamber issue on this particular gun. The failure to feed I think, is more a combination of bullet shape, ramp design, and recoil spring weight.

I only have trouble with those flat nose 147gr rounds. Mine seems to run other 147gr rounds fine.

 

[churchmouse]

Is it Friday....????

 

[deo62]

Is it Friday....????

Too early to tell.

 

[wtburnette]

It's Friday...

 

[Birds Away]

I use Golden Saber 147s exclusively for carry and have run a lot of AE 147s through all of mine with no problems.

 

[MindfulMan]

Spring has sprung ..... Sun's out !
I'm heading to the cabin. Perhaps some morels have sprung .... we'll see !

 

[churchmouse]

Nadscott posted an interesting article regarding bullet design and twist rate over in a different thread. It discusses bullet stabilization and how the length of the bullet impacts the need for higher rotational speeds as bullet length increases. It has me wondering what CZ optimizes their barrels for. Given the issues discussed above with the 147g ammo and the traditionally short chambers in CZs, I'm guessing that they are optimized for 124 to 115 grain bullets.

This might be another opportunity for CM and I to don the lab coats, put a bandaid on the bridge of our safety glasses and break out the slide rules. Or, maybe I could just play with various loads and see what seems inherently more accurate. This is the article Nadscott linked: http://www.schuemann.com/Portals/0/Documentation/Webfile_Barrel_Twist_Rate.pdf

Well heck yues.......Graph paper.We need graph paper and some really sharp #2 pencils.

 

[88E30M50]

I did a quick range trip this morning to run the 75B Compact, P10 and a G thingy in .40. That old 75B compact is sure a sweet shooter. The only thing to note on the range trip is that there is a homeless women that's taken to sleeping in her car along the access road now. Not a safe place for a single women to be sleeping at night and she's making a tight dirt road even tighter.

 

[churchmouse]

I did a quick range trip this morning to run the 75B Compact, P10 and a G thingy in .40. That old 75B compact is sure a sweet shooter. The only thing to note on the range trip is that there is a homeless women that's taken to sleeping in her car along the access road now. Not a safe place for a single women to be sleeping at night and she's making a tight dirt road even tighter.

She needs to be removed. Period.

 

[WebSnyper]

I did a quick range trip this morning to run the 75B Compact, P10 and a G thingy in .40. That old 75B compact is sure a sweet shooter. The only thing to note on the range trip is that there is a homeless women that's taken to sleeping in her car along the access road now. Not a safe place for a single women to be sleeping at night and she's making a tight dirt road even tighter.

What range is this? I think I've heard you mention Point Blank in Greenwood, but checking, as it also sounds like MCF&G possibly?

 

[churchmouse]

What range is this? I think I've heard you mention Point Blank in Greenwood, but checking, as it also sounds like MCF&G possibly?

Yup.....MCF&G

 

[db1959]

I'll be that guy, is she hawt?

 

[WebSnyper]

Yup.....MCF&G

Great, yeah that road is not great at best, without having to deal with that. Thanks for the warning. Does the club own that access road before the gate? Maybe she can be trespassed?

 

[KMaC]

Is she past the RR bridge? That makes it tough since you can't see around the corner.

 

[88E30M50]

She is past the bridge, just short of the gate. I didn't see her, but could tell that she was still sleeping in the car at about 9am. I talked to another member that shoots every day and he says that she's been there two or three days now. He was going to call the club prez to let him know what's going on.

The last thing MCF&G needs is to have a homeless camp establish itself in the woods around there. That would be a major problem in too many ways to think about. I agree CM, she needs to move on and needs to do it immediately.

 

[wtburnette]