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  #676  
Old 06-04-2019, 08:09 PM
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My Competition Electronics Chrono has a Bluetooth attachment that loads all the info onto my Iphone. I was showing my wife (she's a shooter, so understands this stuff ) the bar graphs of several loads. She noticed and asked me if the first shot was always the fastest?

I shoot mostly Lapua, SK or old Wolf ammo through my Vudoo and Anschutz MPR.

It happens regularly enough to get my attention. I just went back through some of my data and it is happening close to 50% of the time on the first shot of a group of up to 20 or 30 shots. Is it because of a cold bore or what. Some of the shots are fast enough above all the rest of the shots to skew the data to show a larger ES than what the rest of the shots would show.

Never a dull moment with rimfire.
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  #677  
Old 06-04-2019, 08:25 PM
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So are you blowing that hot first one (or even the chance of a hot first one) into the berm before going for group?
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  #678  
Old 06-04-2019, 08:34 PM
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Originally Posted by gcrank1 View Post
So are you blowing that hot first one (or even the chance of a hot first one) into the berm before going for group?
I haven't been - - - - - - - Yet.

I shoot long range matches on small steel targets here, https://www.rimfirecentral.com/forum....php?t=1162809 and we get to shoot some sighters before shooting for score. Other matches I shoot might have other sighter shot rules. At Topstraps you shoot the entire match at one sitting. Another match has the shooters take turns and the rifle has a chance to cool off between times. Consistent ammo is needed but there isn't any consistent ammo.
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  #679  
Old 06-04-2019, 08:42 PM
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50% first shot flyer?

Hmmmm, well, it's unlikely that all the cartridges in the box will have the same MV,
so, about half will be faster than the average MV and half will be slower, so yeah,
I can see where the first shot could have a 50% chance of being faster than the rest.

I can justify just about anything if I play with the numbers.

Last edited by jaia; 06-04-2019 at 08:44 PM.
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  #680  
Old 06-04-2019, 08:44 PM
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Originally Posted by gcrank1 View Post
So are you blowing that hot first one (or even the chance of a hot first one) into the berm before going for group?
gcrank--- I regularly see this "hot first one" especially when shooting long range (200 yd) matches. The first round after a "break" in shooting invariably goes high. I ALWAYS put the first round of each string into the backstop, THEN get on the target for record shots. Not really sure why this occurs, but I have seen it happen enough times that I simply do not risk it happening to me anymore... One round into the dirt backstop, THEN start the record shot string.
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  #681  
Old 06-04-2019, 08:59 PM
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Does the first round have a higher velocity and hit higher because the ammo is hotter or because the bore is cold???

Jaia, I expect you will be watching for this and giving us a report.
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  #682  
Old 06-04-2019, 09:23 PM
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Imo, the 'odds' of the 1st shot often being the 'hot one' wouldn't/couldn't consistently be the luck of drawing a higher velo load out of the box. It would possibly be some of them, sure, but would make me consider it is something else as the primary causal factor.
Fwiw, when it matters to me I use every opportunity to use shoot sighters/warm-up shots.
I know I need all the help I can get.
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  #683  
Old 06-05-2019, 06:31 AM
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Originally Posted by gcrank1 View Post
Imo, the 'odds' of the 1st shot often being the 'hot one' wouldn't/couldn't consistently be the luck of drawing a higher velo load out of the box. It would possibly be some of them, sure, but would make me consider it is something else as the primary causal factor.
Fwiw, when it matters to me I use every opportunity to use shoot sighters/warm-up shots.
I know I need all the help I can get.
I'm in that camp. When I said a "break" in shooting I'm talking about perhaps a 15 to 20 minute break between shot strings. For me, this break is usually due to a 200 yd walk downrange to check sighters or to score the first record target before walking back and starting on the second target/string. I'm not sure WHAT the cause is, the main variable being that the rifle/bore has "cooled", BUT I have seen the first shot go high (after resuming shooting from the break) more often than not. If at all possible, I will shoot a round into the berm before continuing on the second record target. If permitted, there is certainly no harm in doing so.
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  #684  
Old 06-05-2019, 09:07 AM
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Y'all are messing with me.

Bad enough I'm slightly OCD, but now y'er gonna have me tracking first shot results too.

Final delivery of rimfire ammo showed up.
Norma magnum rimfire (all CCI production with a Norma label on it)
Couple more Aguila, Armscor, Gemtech, Geco
and the remaining flavors of CCI that finally became available
plus the Eley made Remington target 22lr ammo.

That should get me through the summer.

Few more of y'all should shoot some and add to the list.
It's handy to have other rifles, ammo and shooters to compare with.

Last edited by jaia; 06-05-2019 at 09:09 AM.
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  #685  
Old 06-05-2019, 02:34 PM
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I would love to contribute as well but my local range only goes out to 100 yards. The longer distance range is just too far for regular visits.
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  #686  
Old 06-07-2019, 09:53 AM
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EH, give the RFC CZ 100 yard rimfire challenge a try.
Every month a new target. Some targets for score, some for group size.
22lr, 22wmr, 17hmr, 17hm2 are all allowed, as are other brands of rifles.
I'd still be involved, but the 200 yard bug has got a serious grip on me.

Last edited by jaia; 06-07-2019 at 09:56 AM.
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  #687  
Old 06-09-2019, 10:09 AM
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So much for the cold bore theory.
Both hit low. 22lr and 22wmr.

Reinstalled the Feddersen stubby 22wmr in the 455 SOF.
Sinclair bipod with rear bags, Mueller 8-32x44 target scope

Winchester Dynapoints 45 grain CPHP 22wmr, rated 1550 fps





One odd dropper...didn't match the mv. No idea why.
Maybe deflected off of one of the giant horseflies buzzing around the range.

Last edited by jaia; 06-09-2019 at 01:24 PM.
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  #688  
Old 06-09-2019, 01:33 PM
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CCI Clean 40 grain Polymer coated 22lr, 1235 fps

455 Varmint, Lilja, Sinclair





Bulk plinking ammo. Red, White or blue coating.
Asymmetric bullets, canted seating, two were tilted to where they would not chamber.
No problem, 100 in the box, plenty left to take their place.
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  #689  
Old 06-09-2019, 01:43 PM
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Norma 40 grain CPHP 22wmr rated 1885 fps

CCI styrene box, CCI manufacture date code, CCI mv spread
Yep, It's CCI 22wmr with a RUAG headstamp and Norma label stuck on it.

455 SOF Feddersen stubby, Sinclair, rear bags




Last edited by jaia; 06-09-2019 at 01:45 PM.
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  #690  
Old 06-15-2019, 05:58 PM
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CCI AR Tactical 40 grain CP 22lr, rated 1200 fps

CZ 455 Varmint, Lilja, Sinclair





120 fps ES, visible bullet defects...plinking ammo
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