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  #961  
Old 12-01-2019, 03:32 PM
David Valdina is online now
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Follow up on proposed ammo/barrel length test.



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If the ammo used is the same, and enough shots are taken, the variable in the standard deviation should be due to barrel length.

My thinking goes along these lines: Commonly held "knowledge" is that 16 inches gives maximum velocity for a standard .22 rimfire cartridge. So that is assuming all of the expansion from the powder has taken place. Beyond that, barrel friction will slow the bullet. And earlier, the powder is still burning. I am thinking it may be more difficult to burn the same partial amount of powder for consistent velocities in a very short barrel. And a longer barrel, although maybe slower, may be more consistent.

This is the problem with sitting around and just thinking.

I also shoot old Wolf Match Extra and SK Rifle Match for almost all of my bench shooting.
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  #962  
Old 12-01-2019, 07:17 PM
Arrowhead
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The rest in the second picture is interesting. Is it a commercially made rest or a custom made one?
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  #963  
Old 12-01-2019, 07:43 PM
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In handguns, just as rifles, variations in 'hold' result in spread, it is just magnified with hanguns. It is so predictable that there is an 'error wheel' showing poi changes due to the various holding errors. I havent seen one for rifles, wish I would.
Anyhoo, I figured out for me that to get my primary grip on the gun and Not let go with that hand helped a lot, I do as much other stuff as possible with the other hand if needed.
It is really no big mystery, just do everything exactly the same every time and things tighten up nicely.
Lol......
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  #964  
Old 12-01-2019, 09:19 PM
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I made it. I first made the 40moa mount and planned for a way to add a bi-pod shelf. The brackets straddle the action and the shelf attaches it it.

Still wanted to experiment a bit further to try and eliminate some of the shooter I put with a rear grip/bag hold.

It does really work well but other than using it for our local lo Grange rimfire matches or stretching it out it's pretty impractical. It'll give the rifle guys at the matches run for their money though.

I'll try to add more pictures of various areas tomorrow when I'm on the computer.

Topstrap
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  #965  
Old 12-03-2019, 10:57 AM
Arrowhead
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Thanks for the reply and I'm looking forward to more pictures. I would like something for shooting steel plates at around 100 yards and have been scratching my head about designs. I haven't seen anything commercial so far that has inspired me to build an improved version and certainly nothing I would want to purchase. I'm always interested in what others have dreamed up and built that pertains to the shooting sports.
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  #966  
Old 12-03-2019, 06:47 PM
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I guess I should say this isn't a "rest" but is all integrated together as a single unit that is able to come apart to shoot with a wide range of variables.











I really like the Henry Remple front rest for most of my guns including the pistols, absolutely Rock solid and easily adjustable. I don't allow the fancy benchrest type rests for my matches and use Harris or Atlas for PRS and some of our other style matches.



Topstrap

Last edited by Topstrap44; 12-03-2019 at 06:50 PM.
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  #967  
Old 12-04-2019, 01:24 PM
Arrowhead
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You have nice equipment. I use a front rest that I can level because of the sad shape our tables are in. There has been talk this year about replacing them. I'll believe it when I see it.

I built this a few years ago and it works quite wll in my opinion. It weights a little over 17 1/2 pounds so it stays where it is placed.

https://i.imgur.com/twdXnht.jpg

I have also made a pistol rest top for it that works fairly well but don't have a picture

Last edited by Arrowhead; 12-09-2019 at 10:35 AM.
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  #968  
Old 12-05-2019, 02:06 PM
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Quote:
Originally Posted by Arrowhead View Post
I built this a few years ago and it works quite well in my opinion. It weights a little over 17 1/2 pounds so it stays where it is placed.

https://i.imgur.com/twdXnht.jpg

I have also made a pistol rest top for it that works fairly well but don't have a picture
That Sir, is a fine piece of kit! Built like a tank
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  #969  
Old 12-08-2019, 03:25 PM
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Prime Semi-auto 40 grain 22lr rated 1148 fps

Ruag/RWS headstamp



Ruag/RWS date code on the end flap



CZ 455 Varmint, Lilja barrel, Sinclair bipod



First 50



Second 50




No failure to fires.
Cartridge inspection showed very few dents or dings.
Some excess lubricant congealed as a flat spot on the bullet tips.


So since it's for a semi-auto, out comes the Buckmark Silhouette



Two wood blocks under the towel, much firmer setup.

First 50 I was all over the place adjusting to the mv and wind.
Adjusted the turrets to fit the ammo and conditions.



Second 50 much more consistent



With the SE headwind coming from my 2 o'clock
the turbulence coming over the berm caused some of the vertical,
the rest is on me. Headwinds and tailwinds kick my adze, every time.
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  #970  
Old 12-08-2019, 05:00 PM
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This is 50 at 140 yards. Vudoo, SK Biathlon, bench with bi pod and rear bag. I was practicing running the bolt and shooting as quickly as I could.

IMG_4509.jpg
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  #971  
Old 12-08-2019, 06:17 PM
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Nice work!
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  #972  
Old 12-17-2019, 06:16 PM
jaia
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Armscor 40 grain Standard Velocity rated 1135 fps
Made in the Philippines.



CZ 455 Varmint, Lilja barrel, Sinclair bipod




Rated 1135 fps? Standard Velocity is supposed to be 1070 fps.
Visual inspection of the cartridges shows dents and dings and scratches and tool marks
along with irregular spacing of the drive bands and varied bullet seating.


Chambering showed differences in brass dimensions also.
Some fit snugly, others wobbled around in the chamber.

With those problems already apparent, I expected strays and got them.


Sent the first 5 to adjust the scope, then 45 on target.
ES almost 100 fps, strays spinning off line confirming visible ammo quality.
Three fail to fires that went bang on the second try after extracting, rotating and rechambering.



The next box had the same problems.
Only one fail to fire this run.



The last box had similar results with another fail to fire.



Packed loose like bulk ammo, looks like bulk ammo, results are typical of bulk ammo.
What's that saying about ducks?

quack, quack

Last edited by jaia; 12-17-2019 at 06:49 PM.
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  #973  
Old 12-17-2019, 06:37 PM
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Consistent with my experience at 50 yards with this ammo. . .
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n00by is now flangster on RFC -- still a newbie though
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  #974  
Old 12-29-2019, 03:04 PM
jaia
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End of the year, 2019, last bit of range time at 200 yards.
Pulled the BBBmag test platform off the shelf and reassembled it.



And the first 5 shots at 200 yards produced a random act of accuracy.
Sub-moa...should have stopped right there.
That way I could say "all day long".




Browning 25 grain 17wsm rated 2600 fps.
It's relabeled Winchester production.
Same box, different tip color, Winchester date code on the end flap.



Quick inspection showed broken off ballistic tips, uneven seating depths,
tilted bullets, differing brass dimensions...that's that minimal Winchester quality control.
200 fps ES and the cartridge defects created some spread.



Second box showed more visible defects.
Tips bent or misshapen and uneven bullet seating.
ES was better, only 100 fps, half that of the first box.
1 failure to fire. 4 retries and no joy.
All deep clean strikes, no primer in the rim.




Last edited by jaia; 12-30-2019 at 08:18 AM.
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  #975  
Old 12-29-2019, 03:32 PM
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That stock looks like it is about ready for a spidey paint job
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