CZ 457 Canadian Load Development

Helka

Helka

CGN Regular
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Location
Guelph,ON
So I took her out for the first time today. Shot 13 different makes of ammo out to 100 yards

1)Federal Black
2) Winchester Wildcat
3) Aguila Super Extra
4) Remington Thunderbolt
5) Polish Rimfire Sport
6) CIL Whiz-Bang
7) Federal Match
8) SK Standard
9) Federal Target
10) SK Flat Nose Basic
11) Eley Sport
12) CCI Standard
13) CCI Mini Mag Target

The best being SK’s but CCI’s did very well at almost half the price. Federal Match did very well too. The Whiz-Bang (40-60 years old) was awful.

I had to shoot the 13th grouping at spot one as I had sighted my rifle in with the first group ammo. The rest are all weaker I guess.

Forgot to mention those targets are 3”

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Thanks for this, job well done. I just bought a 457, so I know what ammo I will be starting with. CCI standard for performance/price point
 
The extreme spread (ES) of the ammo will be an important factor in results. With standard velocity ammo, for example, each 10 fps difference between one round and another results in about .25" of vertical. With high velocity ammo, each 10 fps difference between one round and the next results in almost .20" of vertical. Generally speaking, standard velocity ammo, especially the more expensive it is will be more likely to have a smaller ES than high velocity ammo.

The slower standard velocity ammo will probably give better results than high velocity ammo, especially if there's any wind. Compare the ballistics data below. CCI SV above and Federal Long Rifle Solid high velocity (as an example) below.

To get reliable data a very consistent set up is needed. A very slight irregularity in shot execution due to set up inconsistency may scew the results. What set-up was used? A bipod? Front rest/rear bag?



 
Do you still have the target to measure the group sizes of the best few? I don’t feel so bad about my Savage MKII at 100yds shooting multiple 10rnd groups consistently at 2 1/4” with CCI SV.
 
time4t said:
I would not rely on the results of one 5 round test, as presented. There are several types/groups worthy of more testing. Personally, I do not judge any 22 caliber rimfire load until I have run a minimum of ten 5 round groups on various days. On my bipod, bag setup - the cci standard, rws and plain bulk federal 36 hp all demonstrate best 10x5-50 shot average test honors at about one moa. I have not tested the really expensive competition stuff as there is no need.
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The intention of this test was to see what shot best out of my gun. Now I have it narrowed to 4 different makes. Now I will focus on those for better testing.
 
I’m very pleased with it all. I did change a few things. Added the MDT scope mount. Yodave trigger spring, Yodave firing pin spring and the extended mag release also added a fancy flash hider for looks lol. Now debating on which Bolt knob to go with. I’m liking the Dip executive bolt knob.

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time4t gives good advice.

Helka said:
The intention of this test was to see what shot best out of my gun. Now I have it narrowed to 4 different makes. Now I will focus on those for better testing.
Click to expand...

A single group won't tell you much about any ammo. Stick to the standard velocity ammos only and shoot ten five-round groups of each variety. For each variety of ammo, there will be considerable variation between the sizes of each group. Only a sufficient amount of data will make it possible to determine what ammo to choose from among many very similar candidates.
 
Nice looking rig there. If you don’t mind me asking, where did you find your flash hider? I have the American model, so already a 24” barrel. Anything extra is going to make it crazy long. Interesting that you switched to the YoDave trigger. I find the adjustable trigger of the 457 quite nice. Is it worth the upgrade?









Helka said:
I’m very pleased with it all. I did change a few things. Added the MDT scope mount. Yodave trigger spring, Yodave firing pin spring and the extended mag release also added a fancy flash hider for looks lol. Now debating on which Bolt knob to go with. I’m liking the Dip executive bolt knob.

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Click to expand...
 
I got the conversion thread from 1/2x20 to 1/2x28 and used a Daniel defence I had on one of those scary mass murder guns. As for groupings at 50 my range only has 25 and 100
 
Just had a chance to measure my groupings

1)Federal Black 1.81”
2) Winchester Wildcat 1.48”
3) Aguila Super Extra 2.416”
4) Remington Thunderbolt 2.183”
5) Polish Rimfire Sport 2.606”
6) CIL Whiz-Bang 4.101”
7) Federal Match 1.319”
8) SK Standard 1.05”
9) Federal Target 1.368”
10) SK Flat Nose Basic 0.857”
11) Eley Sport 1.887”
12) CCI Standard 0.976”
13) CCI Mini Mag Target 1.52”
 
7) Federal Match 1.319”. Is this the 922A with a silver bullet on the top of the box. The one I refer to is made by RWS to R-50 standards, Also comes in the UM-1which may be similar to R-100
8) SK Standard 1.05”. Well reported on.
9) Federal Target 1.368”. This comes in Standard and Hi velocity . . . which one is this?
10) SK Flat Nose Basic 0.857”. Many good reports.
11) Eley Sport 1.887”. Just because it says ELEY it is near the cheapest variety bearing the name.
12) CCI Standard 0.976”. This is always a good starting point. There are two varieties: The plastic box 100 made in Idaho and the Paper boxes of 50 manufactured under contract and generally cheaper
13) CCI Mini Mag Target 1.52”. Target is a misnomer!

Now that you have determined some likes, extend your testing to ten rounds per group to verify it was not just a fluke. When my 11 year old grandson shot a 0.83 c-c group at 300 yards he knew he ws flirting with danger going for a 5-shot group.
Same idea.
 
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