CZ 75B Omega

[wv109323]

 I have one that I am trying to work up a reload to shoot USPSA. I would like to shoot cast bullets. I can not find a bullet that is accurate when you approach the 130 power factor. The only powder I have tried is W231 but have tried 145 Bayou, 135 Bayou(both powder coated) , 125 cast and 120 cast. I can get decent accuracy with the 125 and 120 bullets if I keep them around 925 FPS. I need 1040 and 1083 FPS to be legal.
 My bore is .3565 so I need a .357+ bullet. What are some loads that work in your gun? What type of accuracy do you expect for 25 yard groups?

[Wobbly]

I have one that I am trying to work up a reload to shoot USPSA. I would like to shoot cast bullets. I can not find a bullet that is accurate when you approach the 130 power factor.

And what lead bullets have you tries that are not accurate ?

[Dan_69GTX]

How are you testing - ransom rest, free hand, pistol rest, etc?
How do other bullets compare - JHP, RN, plated, etc - asking because is it the bullet, load, gun, technique, etc.

I've had GREAT success with ACME, Gallant, Blue Bullets, BBI, etc.

Are you using the same brass?  I know, for me, different brass when I'm trying to see how consistent a load is, makes a BIG difference.  So EVERYTHING should be the same - brass, bullets, loading technique, etc.

Here are some results from MY gun - Shadow Target 2 - using ACME 124 RN (new profile) .357 diameter.  Notice how different powders affect the results?

All are 10 shots and are right at 130PF.

I ended up not using these (or any coated) bullets in this gun - because of leading issues.  I needed to go to .358, but had other issues due to the ogive.

I have been using these bullets in other guns with great success and no leading.

[wv109323]

I have tried my cast Lee 120 CN. They cast at .356 which is not big enough for my bore of .3565. I powder coated some and sized to .3575. The .3575 work with 3.4g of 231 with groups less than 2" at 20 yards. Ransom Rested. Speed the same bullet up to 4.2g 231 and groups are 5-6" at 20 yards.
Since the .356-120 mold was small, I bought a Lee .358- 125 RNFP mold. I size these to.3582. I have tried lubed and powder coated. With 4.2 g of 231 these are shotgun patterns. Slow them up and they are decent. The Bayou bullets were powder coated .356 and .357. with large groups of 4-6" at 20 yards.
The latest testing was done with the same headstamp brass loaded on a Dillon 550 with Dillon dies and taper crimped to .378. I am going to try Bullseye powder and Unique to see if I can get to a 130 PF with accuracy. I have Clays, AA7 , and WST That could be used.
 I have not tried any jacketed bullets as I would like to shoot cast.
 Another thing I had the barrel throated so that I could use lead bullets. Originally the barrel had almost no leade and the cast bullets were hitting the rifling.

[Dan_69GTX]

Good to know.

For the sake of science/proving things I would try cheap brass ammo, high-quality brass ammo, (both factory), And high-quality bullets in your reloads. If one works better than the other, you have something to go on. If they all behave the same, you know it is the gun

[Wobbly]

I might suggest the coated 135gr IDP#8 from MBC. Being made for a 38Super these are slightly larger. They shoot really well in my SP-01 and will end your bullet fit concerns.

https://missouribullet.com/details.php?prodId=334&category=5&secondary=26&keywords=

We did a lot of testing on these, and posted them here...

https://czfirearms.us/index.php?topic=96152.msg739645#msg739645


Hope this helps.

[wv109323]

The 135 Bayou bullets I have are exactly like the MBC.( RN powder coated and .357 dia.) I am going to try 4.0 of W231.

[Wobbly]

The 135 Bayou bullets I have are exactly like the MBC. (RN powder coated and .357 dia.) I am going to try 4.0 of W231.

Well, going by the data already quoted... you'll need to be up to at least 4.1gr at OAL 1.130" to even make PF. So it's no wonder you're not seeing much accuracy.

[Dan_69GTX]

The 135 Bayou bullets I have are exactly like the MBC.( RN powder coated and .357 dia.) I am going to try 4.0 of W231.

So, you are refusing to do any testing to prove it isn’t the gun?!?  Why?

Ummmm. You already said you tested them and have 4-6” at 20 yards.   I don’t understand you logic.  Please explain why you are going to retest and expect different results?   What are you changing?

[Wobbly]

Please explain why you are going to retest and expect different results?

I'm reminded of one definition of insanity... doing the same thing multiple times and expecting a different result.

[wv109323]

 I upped the powder charge from first test. Not the same load. I did not use 4.1 or 4.2 grains of 231 in the first Bayou bullets. The 4,2 was with the 120 and 125 g. bullets.