Does weighing and measuring rim thickness of the 22lr help with fliers and tightening up groups?
Weighing and measuring rim thickness on 22lr
- Thread starter hotshot828
- Start date
NO!
You'd be way better off sorting through the cartridges and culling those those with bullets that aren't very uniform (e.g. dents, scratches, driving bands that are not uniform).
Hi-NV Shooter
Gold $$ Contributor
Only AOL length sorting has proven to me to be the only viable means to sort ammo that works.
Weight sorting only proves variation in weight. rim thickness is the same variations on rim thickness.
AOL will actually provide how much more or less the bullet will engage the rifling similar to seating depth CFBR shooters do when reloading.
Lee
Coyotefurharvester
Silver $$ Contributor
Lee, how does a typical box(50) breakdown in number of groups of ammo? What is the length range variation that can make up a group of ammo?
buckeye68
Gold $$ Contributor
I measured rim thickness just once for a test just to make sure whatever everyone was saying was true. It is true, it’s a waste of time.
I measured one whole brick and grouped them all with the same rim thickness, from the thinnest to the thickest. I had enough to shoot one whole match with all the same rim measurement. At the end of the last card, I moved over to a sighter bull and shot 3 of the thinnest rim and 3 of the thickest rim. All bullets went in the same hole in the paper. No more ammo sorting for me.
I measured one whole brick and grouped them all with the same rim thickness, from the thinnest to the thickest. I had enough to shoot one whole match with all the same rim measurement. At the end of the last card, I moved over to a sighter bull and shot 3 of the thinnest rim and 3 of the thickest rim. All bullets went in the same hole in the paper. No more ammo sorting for me.
Hi-NV Shooter
Gold $$ Contributor
My current CX bought in April using .005 as the margin of separation I have been seeing a majority of three different groups. and this is only with a 0.005 separation. for example, measurements are 0.710,0.715 & .0720 65% are spread between 0.715 & 0.720
I will say this that Lapua's quality as far as AOL is concerned has been improving year after year if not month after month. 6 years ago, it wasn't unusual to see 4-5 different AOL groups with more than 0.025 separation!
Lee
foxguy
Gold $$ Contributor
Lee, how are you measuring the OAL? Just to the driving bands.
Also, what gauge are you using?
thanks
Hi-NV Shooter
Gold $$ Contributor
Measurements are just at the Ogive. I use a MKII gauge unfortunately it is no longer being made.
Lee
Attachments
Thanks for your input. I shoot match ammo so I won't sort.
Lee, I had one of these. I tried separating by OAL (ogive really). When I was done I went to the range. I shot about 4 shots of the middle range and then shot both extremes, short and long into that same group. All went into the same group. Did it several times, same results. I sold the gizmo.
Best to you,
John H. you know who.
I believe this to be as true as I know the sun is going to rise tomorrow.
centershot
Silver $$ Contributor
Years ago I had the opportunity to shoot in a school basement. Virtually no conditions. It was farther than 50 feet, maybe 70. My gunsmith and I tried various things to try to make any ammo shoot better. I had the Neil Jones rim thickness gauge and found it did not make things better. I started weighing the cartridges and it did make a difference. Cheep ammo or expensive ammo. I would shoot groups with a wide variance in weight and the groups did open up. Similar weights and they got smaller. This was with an Anchutz 1413.At the time I was using PMC Match which is no longer sold. Shot quite a few 100 prone on the A36 target using that ammo and weighing.
Your opinion may vary.
Your opinion may vary.
Mike Montgomery
Silver $$ Contributor
I will sort rim thickness when I have a given lot spitting some.
I have proven to myself that it does work. It's simply all about
ignition and keeping the consistency closer. I use a Hollands
comparator, Not shown is the separate die that acts like a full
chamber, then I screw on a wide , flat tip to fully cover the base
of the case. Even with some of the good stuff, I have found ones
as much as .015". it's either from the material itself or a deformity
at the base. The Hollands is pretty fast. I'll take a pic of my actual
set up if someone needs it......
I have proven to myself that it does work. It's simply all about
ignition and keeping the consistency closer. I use a Hollands
comparator, Not shown is the separate die that acts like a full
chamber, then I screw on a wide , flat tip to fully cover the base
of the case. Even with some of the good stuff, I have found ones
as much as .015". it's either from the material itself or a deformity
at the base. The Hollands is pretty fast. I'll take a pic of my actual
set up if someone needs it......
Attachments
Hi-NV Shooter
Gold $$ Contributor
Hey John,
Since I can't get to the test center this is the only way I can use ammo that I just buy when I can find it. last year I did decently shooting sorted ammo. I am not known to keep data records like some. I provide what has worked for me.
if others try what I am doing, and it helps good for them if it doesn't well at least they answered any question in their mind.
Lee
Upgrades & Donations
This Forum's expenses are primarily paid by member contributions. You can upgrade your Forum membership in seconds. Gold and Silver members get unlimited FREE classifieds for one year. Gold members can upload custom avatars.
Click Upgrade Membership Button ABOVE to get Gold or Silver Status.
You can also donate any amount, large or small, with the button below. Include your Forum Name in the PayPal Notes field.
To DONATE by CHECK, or make a recurring donation, CLICK HERE to learn how.
Click Upgrade Membership Button ABOVE to get Gold or Silver Status.
You can also donate any amount, large or small, with the button below. Include your Forum Name in the PayPal Notes field.
To DONATE by CHECK, or make a recurring donation, CLICK HERE to learn how.