Prep of 22rf method?

[foxguy]

I sort in groups with 0.005 spread as I didn't see where 0.005 made a difference for example 0.725-0.730 would be grouped together.

Lee

Lee,

I see in a previous post you said sorting into groups of 0.015, are you sorting to the center of the batch and anything outside of the 0.015 center(+- 0.0075) is the outlier?

And...

Your Sorting to Groups of .005 Example 0.725- 0.730. another sort possibly being 0.740-0.745.
Are you seeing 2 groups of appx the same size, just one being a little higher in Vert than the other, and have you check the Velocity of the 2 sorted ammo groups and seen a difference in the velocity - thus the difference in vertical? Thanks for sharing all of this info in regard to your sorting and findings.

 

[TRSR8]

Yep factory barrel. It’s a Custom shop 40XR from the 1990’s .
Haven’t noticed some short rounds are tighter. A few years ago when CX and Midas were unobtainable I remember reading guys were having good results with PK. It shoots well for me unsorted . I don’t think I ever measured PK.
I don’t compete - matches are way too far away. I’m the only one at my club shooting a rimfire bench gun.
The rifle does great for me, I’ve been able to clean the Green Monster with 11-16 X’s, the easiest score target…. I got a lot of them.

View attachment 1754384

Curious, have you checked twist on that barrel?
I ask because that version of 40X, lots came with 14 twist barrels for unexplained reasons.

 

[Hi-NV Shooter]

Lee,

I see in a previous post you said sorting into groups of 0.015, are you sorting to the center of the batch and anything outside of the 0.015 center(+- 0.0075) is the outlier?

And...

Your Sorting to Groups of .005 Example 0.725- 0.730. another sort possibly being 0.740-0.745.
Are you seeing 2 groups of appx the same size, just one being a little higher in Vert than the other, and have you check the Velocity of the 2 sorted ammo groups and seen a difference in the velocity - thus the difference in vertical? Thanks for sharing all of this info in regard to your sorting and findings.

I used sort by the actual number but found 0.005 to be insignificant to make a difference. so, if I measure a round that was 0.720 all the rounds measuring to that would be grouped only by that measurement, it was longer process especially with some lots that had lot of different lengths. so, I now sort and group measurements that are within 0.005 of each other so as an example 0.720-0.725 is one group.
what I mean by 0.015 as the maximum spread is if I sort a box for example and get 50% at 0.730-0.735 and 45% at 0.740-0.745 anything outside of these two majority groups would be cast aside and not included with the two sorted groups. because there should be if it is a decent lot only a few rounds that should not be included. the Midas+ I got from the Mesa center was one of the most consistent lots as far as the spread.
I had only 5 boxes which their measurements could not be included with either of the 0.730-0.735 or 0.740-0.745 groups.
on the vertical difference between the two sorted groups if I shot both on an ARA UL target, I would see a shot be inside or be a line licker if using the same hold for the conditions. this is best case results, but if I shot a 0.730 round and then right after shot a 0.745 if may become a 50 or sometimes worst a 25 this why I use the 0.015 spread.
maybe some of the others can share but what I see with long versus short long goes lower and shorter higher from POA not a lot as I said earlier maybe a bullet diameter to a bullet and half. I have not chrono the velocity between lengths

Lee

 

[1911nut]

Curious, have you checked twist on that barrel?
I ask because that version of 40X, lots came with 14 twist barrels for unexplained reasons.

I will check.

 

[1911nut]

Nice looking rifle. try sorting the PK you might be surprised on the resullts.

Lee

I’ll try that.

 

[wkdickinson]

At our club we have a "covered" firing line, a roof. But because of our snow conditions, the roof is peaked and we believe that the peak acts similarly to an airplane wing. The result being that if the wind switches to coming from behind the line, we get all kinds of weird vertical and there is no way to identify it, at least not that any of us have been able to come up with.

 

[1911nut]

At our club we have a "covered" firing line, a roof. But because of our snow conditions, the roof is peaked and we believe that the peak acts similarly to an airplane wing. The result being that if the wind switches to coming from behind the line, we get all kinds of weird vertical and there is no way to identify it, at least not that any of us have been able to come up with.

My range has a similar roof. I see strange things happen when we get a south wind. Luckily the most common winds are SW to NW.

This might be a solution.

 

[Hi-NV Shooter]

At our club we have a "covered" firing line, a roof. But because of our snow conditions, the roof is peaked and we believe that the peak acts similarly to an airplane wing. The result being that if the wind switches to coming from behind the line, we get all kinds of weird vertical and there is no way to identify it, at least not that any of us have been able to come up with.

We have pillars to support the roof and some of the benches are next to them so if you end up on one of them benches it gets interesting as I believe the wind can swirl around it and cause some issues! add in berms in between it gets really interesting sometimes.

Lee

 

[1911nut]

is your 40X factory barreled? could be why. I am shooting benchmarks all setup with the Nevius chamber with minimum engraving of 0.030.
Have you noticed some rounds are tighter even though the measured length is shorter? I have with this lot of Midas+ also are you seeing the PK measuring shorter than the CX? all the PK I have measured is way shorter than any CX as much as 0.040 normally in the 0.680-0.710 range

Lee

I just sorted a brick of PK. Using the relative lengths/ reading on the gauge, the range was 23-27 for a 0.004” range. There were two rounds that were 30 and one round 21.

My previous sorted CX ranged 25 to 28 with several rounds > 30 and several 22-23.

I’ll be looking at what the longest and shortest rounds do on paper.

 

[1911nut]

Curious, have you checked twist on that barrel?
I ask because that version of 40X, lots came with 14 twist barrels for unexplained reasons.

It takes 16” for the cleaning rod to make one revolution.

 

[Fire Dog]

My range has a similar roof. I see strange things happen when we get a south wind. Luckily the most common winds are SW to NW.

This might be a solution.

View attachment 1754767

The link from those flags…

The Uppy Downy - Bundle » Graham Wind Flags

The Uppy/Downy flag identifies up drafts and downdraft winds found at ranges with baffles, berms, barriers, trees, gullies or swirling wind. Customer Notice: Most products are made to order and this takes time. I strive to get orders shipped as soon as possible and am constantly improving my...

www.brflags.com

 

[slobhunter2]

Made this today, had a old Wilson seating die laying around, spent about 3 hours piddling with it.
PK was running around.003 less than center x and Midas plus, checking several different boxes variances were .005 with the individual boxes checking around .003 .

 

[Hi-NV Shooter]

Made this today, had a old Wilson seating die laying around, spent about 3 hours piddling with it.
PK was running around.003 less than center x and Midas plus, checking several different boxes variances were .005 with the individual boxes checking around .003 .View attachment 1755181

How many sorted groups did end up with?

Lee

 

[slobhunter2]

How many sorted groups did end up with?

Lee

I just have them sorted in the boxes by the.001, I need to do some testing to see if I'm gaining anything from measuring them, not sure if I'm a good enough shooter to tell the difference.

 

[USMCDOC]

I have one of those gauges like Lee has, last year I recieved a txt from a fella saying that they were going to start shooting 100 yard RF BR using the UBR 22 cal 100 yard target. What I found was that the 9 ring on the 50 meter RF Smallbore target is the same size as the 10 ring on the 22cal UBR target. So I decided I would use some sorted Lapua Pistol ammo I had. Shot this target at 100 yards. I sent the pic back to that fella,.. I never heard another word out of that guy.. I wonder why?

 

[grauhanen]

What happens at 100 yards with .22LR even under the calmest conditions is often as much due to good fortune as anything else, including any ammo measuring gauges.

Fifty yards is within the range of consistent performance for the best lots of match .22LR ammo. One hundred yards is at the outer limits. In other words, it's harder to get consistently good results regularly at 100. The further the distance, the more the ammo can behave unexpectedly.

 

[Hi-NV Shooter]

here is a tool made by Sinclair that can be used to sort. it is for sorting OAL of CF bullets