Nice shooting. I added you to the successful list.Shot this Friday afternoon at range..
Groups are .466" .399" .322" .355" .441" Average .396" smallest .322" correction used .222"
Shooter used CZ 455 Lux in Evo Stock. Ammo SK Magazine.
My 22 shoots 1/2" groups at 50 yards/meters all day! Really? Prove it!
- Thread starter Underthegun
- Start date
Thanks
I am going to attempt it again when i have finished tweaking another 455 american barrel that seems to need a some attention. It is very time consuming as most of us have discovered to make small changes one at a time and strive for better groups. Still a fun challenge to partake in.
R
I am going to attempt it again when i have finished tweaking another 455 american barrel that seems to need a some attention. It is very time consuming as most of us have discovered to make small changes one at a time and strive for better groups. Still a fun challenge to partake in.
R
Rod B
CGN Ultra frequent flyer
A man can do far worse things in his spare time.
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So close!
Out in the rain today. I got very close with my CIL/ Anshutz bolt action.
Hundred thou less and I'd be good! I was using Eley Club for ammo. Most consistent I've used yet.
Now I just have to tighten it up a wee bit and do 5 in a row!
Think I still have some work to do.
Out in the rain today. I got very close with my CIL/ Anshutz bolt action.
Hundred thou less and I'd be good! I was using Eley Club for ammo. Most consistent I've used yet.
Now I just have to tighten it up a wee bit and do 5 in a row!
Think I still have some work to do.
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Rod B
CGN Ultra frequent flyer
A couple observations Hovenator. Those splash targets make it difficult to find the true edge of the hole for measuring, plain colour target paper is best. Take the measurement to the outside of the black smudge mark the bullets make and subtract 0.22" for center-center reading. The group in the bottom picture is larger than you're measuring That caliper needs to be rotated 90 degrees and all groups have to be measured at their widest point. On a second look I see it's the same group as in pic one. Sorry, I don't make the rules!
That caliper needs to be rotated 90 degrees and all groups have to be measured at their widest point. On a second look I see it's the same group as in pic one. Sorry, I don't make the rules!
Rod B
CGN Ultra frequent flyer
A couple observations Hovenator. Those splash targets make it difficult to find the true edge of the hole for measuring, plain colour target paper is best. Take the measurement to the outside of the black smudge mark the bullets make and subtract 0.22" for center-center reading. The group in the bottom picture is larger than you're measuring
Darn good advice. I failed to notice that you were using "splash" targets.
Thanks for the advise. I have been shooting "bulk" ammo up until now. I had a read of the rules and I'll set up a better target and make a few more tries. It looks like most people are using a lead sled or similar set up. I have just been using a front rest and I'm sure that doesn't help with the consistency. I think the rifle is capable,we will see ifI am!
I have been shooting "bulk" ammo up until now. I had a read of the rules and I'll set up a better target and make a few more tries. It looks like most people are using a lead sled or similar set up. I have just been using a front rest and I'm sure that doesn't help with the consistency. I think the rifle is capable,we will see ifI am!
Rod B
CGN Ultra frequent flyer
Things have been very quiet on this thread. I am thinking many of us are waiting for milder weather before making more attempts at the 1/2" challenge.
I want to try it with my BSA Martini MKV & the Anschutz 2007 but this old guy gets very cold hands trying to shoot in the winter.
I want to try it with my BSA Martini MKV & the Anschutz 2007 but this old guy gets very cold hands trying to shoot in the winter.
.22's seem to shoot a lot worse in cold temps. Is it the ammo or the rifle? I see Anschutz are making biathalon rifle barrels that are supposed to shoot better in the cold....and you can get cold temp ammo (polar biathalon), so maybe its both....?
Yeah cold temperatures have a significant effect on the ammo for one. My POI was 4 inches lower at 50 yards than the summer time zero. Cold suppresses the rate of chemical reactions (combustion in this case) so the primer and powder burn rate takes on a different characteristic than it has during the summer. Rimfires seem to be very sensitive to harmonics so a particular load that was in "tune" when warm will most likely be out of "tune" in the cold. Cold lube also stiffens up and takes on a higher viscosity, affecting how the bullet rides through the barrel. You can bet money on the fact that the velocity will be much lower in the cold.
I'm not sure about the merit of barrels designed for the cold and can only speculate on some theory why. Info on the Anschütz website just says they are "cold tested" and nitrided for longer service life. Maybe some barrels for unknown reasons only perform well when warm while other barrels don't care what temperature they are used at. I just read it as Anschütz simply tests the barrels to confirm they are good in the cold rather than them having some specific property that lends itself to better cold performance. We know materials contract when cold, perhaps the bore diameter is reamed slightly larger than normal so that it contracts to the ideal dimension when cold? Other than that maybe the nitride coating has an effect on friction helping the bullet get a smooth ride with the cold weather engineered lube? Or it could be to prevent corrosion in the bore since combustion produces water vapor which would quickly condense in the cold and settle in the barrel.
Before I get back into this thread/challenge I've got some build and repair projects to finish which will likely be around April/May.
I'm not sure about the merit of barrels designed for the cold and can only speculate on some theory why. Info on the Anschütz website just says they are "cold tested" and nitrided for longer service life. Maybe some barrels for unknown reasons only perform well when warm while other barrels don't care what temperature they are used at. I just read it as Anschütz simply tests the barrels to confirm they are good in the cold rather than them having some specific property that lends itself to better cold performance. We know materials contract when cold, perhaps the bore diameter is reamed slightly larger than normal so that it contracts to the ideal dimension when cold? Other than that maybe the nitride coating has an effect on friction helping the bullet get a smooth ride with the cold weather engineered lube? Or it could be to prevent corrosion in the bore since combustion produces water vapor which would quickly condense in the cold and settle in the barrel.
Before I get back into this thread/challenge I've got some build and repair projects to finish which will likely be around April/May.
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I shot one with my new to me Annie 1813 super match in less than ideal conditions but don't want to submit it until it's all .2s and .3s. I kept the ammo in my truck and pockets.
In cold weather, I keep my rimfire ammo in a cooler with a bottle of hot water and a couple hand towels to keep it warm until I'm ready to load it in the mag. Practical at the bench, not so much for field use.
I suspect the Anschutz "biathlon tested" barrels may be less prone to cold bore flyers than their run of the mill barrels, maybe as a result of stress relieving, different heat treating, or simply falling within a different specification for cold bore accuracy. A rifle that throws the first shot 2 inches wide at 50m is going to be a liability in biathlon.
I suspect the Anschutz "biathlon tested" barrels may be less prone to cold bore flyers than their run of the mill barrels, maybe as a result of stress relieving, different heat treating, or simply falling within a different specification for cold bore accuracy. A rifle that throws the first shot 2 inches wide at 50m is going to be a liability in biathlon.
It is my intention to produce five 5 shot groups under the magic 1/2 inch.
Today was the first attempt and the first group showed it was possible at 0.47 c-c.
that was followed by 0.79, 0.78, 0.90, 0.91, 0.59, 0.70, and 0.96.
Conditions were hardly ideal with the temp at 2 degrees and shifty winds.
Used the BSA Martini Int'l Mk II and Federal 922a ammo.
Undoubtedly there is a degree of difficult.
Today was the first attempt and the first group showed it was possible at 0.47 c-c.
that was followed by 0.79, 0.78, 0.90, 0.91, 0.59, 0.70, and 0.96.
Conditions were hardly ideal with the temp at 2 degrees and shifty winds.
Used the BSA Martini Int'l Mk II and Federal 922a ammo.
Undoubtedly there is a degree of difficult.
Nice, The only degree of difficulty for this is ponying up the cash to buy a rifle and find the match ammo it likes that can do this challenge.
