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  #16  
Old 03-22-2019, 02:33 PM
plumas
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Jaia is right on...
the variables are overwhelming for most average shooters...still interesting to discuss though.

For my chrono info listed in a post here the temp was 45F, altitude 4600. The altitude alone reduces air friction and increases velocity as atmospheric pressure at that elevation is about 12.4 psi.

Are my findings of higher velocity than box labels attributed to the elevation? Longer or shorter barrel than the lab model, chamber fit to account for gas leaks..etc.

Without a like test from the same barrel at a different altitude and same ammo lot for comparison its hard to say...maybe someone else here understands more than I do.

Air temp will effect powder burn efficiency and pressure curve, and of course barrel length is thrown in there.

Too much for me...at 50-150 yards the science does not need to be that perfect...just an understanding of one's own equipment and a good trajectory chart and range finder for the off chance of a longer shot than 'dead-on' hold is good enough for me.
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  #17  
Old 03-23-2019, 05:54 AM
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I have chrono'd my Savage 93R BTVS with a Magneto Speed V3 and they was higher than advertised. I haven't chrono'd my Ruger American Target with an 18 inch barrel yet and I plan to do so along with my Garrow upper. My plan is to chrono all 3 using the same lot numbers and try to find atleast 5 with same exact rim thickness to chrono to see if the SD improves.

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  #18  
Old 03-23-2019, 04:33 PM
plumas
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The barrel lengths will be interesting...unless there is something special about .17
I would presume a 20-30 fps+- drop in velocity per inch lost can be expected?
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  #19  
Old 03-23-2019, 08:05 PM
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Quote:
Originally Posted by Smoothtrigger View Post
For what it's worth, I've shot over 22,000 rounds of 17hmr over the last 9 years, and have never had a single spit case.
Never found one in a box, and never after it's been shot.

I only shot one box of Winchester, and they would barley chamber in my Anschutz's, and were hard to extract. Really complete crap.
Makes me wonder how tight some rifles chambers are.
Rifles are a Volquartesn Fusion semi-auto, a pair of Anschutz 1717's, and a Anschutz 1727F.

Smooth

Seems to me that people have either a poor chambered gun or maybe its older ammo and brittle but none the less they like to blame the ammo never the gun. Splits as frequent as mentioned above would have me questioning the gun. I've never been around what I considered a great hmr that had cz on the side either. I agree with the chamber statement and TNT ammo in most hmrs for accuracy. The volquartsen is a good choice too.
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  #20  
Old 03-23-2019, 08:20 PM
Scott8401

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My brother and I mainly shoot 17hmr's from 3 different manufacturers without a split case. We mostly shoot Hornady 20 grain XTP's, CCI FMJ's and Federal Vshok TNT's.
Marlin XT
Savage 93R
Ruger American Rimfire Target

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  #21  
Old 03-23-2019, 08:42 PM
jaia
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Some of us are just lucky I guess, when it comes to finding split necks...




Scott...all three of those labels are CCI products.

Last edited by jaia; 03-24-2019 at 01:34 PM.
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  #22  
Old 03-24-2019, 07:20 PM
Ol` Joe
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Quote:
Originally Posted by jaia View Post
Some of us are just lucky I guess, when it comes to finding split necks...




Scott...all three of those labels are CCI products.
Shhhhhhh...

It is not just one brand over the years either.
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  #23  
Old 03-26-2019, 09:48 AM
plumas
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That un-fired split 17....any communication with CCI?...curious about their response both as a public relations nightmare and as any technical answer they may have offered.
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  #24  
Old 03-26-2019, 10:29 AM
jaia
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Nope, not worth the effort. One out of five hundred.
Used it to obtain a peek inside and look at the components.
Slight difference in the powder texture, smaller granules from the last time I pulled one apart.
The rest looked as expected.

Brass hardness varies depending on the supplier.
I read they neck down after priming and can't anneal with primer in the case.
Work hardening occurs and cracks happen.

Last edited by jaia; 03-26-2019 at 10:32 AM.
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  #25  
Old 04-26-2019, 09:31 AM
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Interesting split neck.......I have yet to see one split, fired or not. As to the fps question, last time out my CZ457 American w/24" Barrel was averaging right at 2800fps @ 4000' and 50degree day with Hornady 17gr Vmax's. They shoot excellent out of this rifle and hammer rock chucks. Have not tried anything else, happy with the Hornadys.
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  #26  
Old 04-26-2019, 10:32 AM
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Looks like it will shoot all of these fairly close to POI of each other after adjusting scope to center on target. I shot some the next day and all three types of ammo were grouping pretty close to one another. My CZ likes the CCI A17 ammo which doesn't seem to have the best reputation. I shot the first 5 round group on all ammo types then shot a 10 shot group of the best (A17), other ammo I tried was CCI Gamepoint 17gr, and Hornady 20gr XTP, they didn't group as well. The rifle before shooting these groups only had about 20 rounds through it so hopefully those groups could shrink a bit. There was a 5-7 mph breeze heading in a 4:30 direction at time of shooting.

Here are some 100 yard results from my 457 Varmint:








Last edited by CZemplary; 04-26-2019 at 10:36 AM.
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  #27  
Old 04-26-2019, 11:53 AM
jaia
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Decent groups there.
How well do you think you could do for score?
10 shots at 100 or 200 yards?

https://www.rimfirecentral.com/forum...47&postcount=1

Wind and 17hmr ammo quality kick my butt.

Last edited by jaia; 04-26-2019 at 11:55 AM.
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  #28  
Old 04-26-2019, 03:45 PM
CZemplary

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All groups were at 100 yards. Don't know about score. The 17HMR does better than .22lr in the wind, but yes the ammo quality game needs to be upped. We 17HMR shooters really need CCI or any of the match .22lr manufacturers to put out a 17HMR match line of cartridges. I've asked CCI and they said they have no immediate plans for match 17HMR but would relay my desire to their R&D department.

The ES numbers on 17HMR ammo are rediculous, but its still a lot of fun to use on varmints and is more than accurate enough for that job. Match shooting however, there needs significant work on the ammo front.

Last edited by CZemplary; 04-26-2019 at 03:48 PM.
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