Sorting Center-X rim to ogive

[wkdickinson]

Sorting the current lot I have with the best tuner setting I found so far shot several 5 shot groups in the low 1’s. Unsorted ammo often had one round that was a bullet width or more away from the group. That is too much variation. The gauge doesn’t measure rim thickness, it measures from the front side of the rim to the “ogive”.
So far I’ve grouped the ammo to length, eg, all 25 or all 26 lengths. I found the tune that shoots both these lengths the smallest. Not enough experience yet to distinguish 0.001” difference in length, probably never will.
I have sorted and test shot the same lots. Before sorting, the shots out of the groups were deemed to be me or a missed wind change. The issue first surfaced in a lot that varied from 23 to 29 on the gauge, fliers were greatly reduced shooting the same length.
Ive got a lot more shooting to confirm the value of this kind of sorting but so far I’m encouraged to continue.

Forgive me if you already mentioned this, but are you measuring from the cartridge “base” or the the inside of the rim that would index on the barrel?

 

[1911nut]

Forgive me if you already mentioned this, but are you measuring from the cartridge “base” or the the inside of the rim that would index on the barrel?

the inside of the rim, the front of the rim, the side of the rim that touches the barrel.

 

[BeefyT11]

G3 Rimfire Rim Thickness Tool and Base-to-Ogive Length Gauge « Daily Bulletin

Gerry Gereg makes two precision tools that let rimfire shooters pre-sort their ammo for improved accuracy. The first tool, the G3 Rimfire Thickness Gauge, lets you sort rimfire ammo by rim thickness. This tool clamps to the jaws of your calipers and is very simple to use. Just slide a cartridge...

bulletin.accurateshooter.com

 

[Hi-NV Shooter]

where approximately, on the ogive, is your reference point for measure?
Front or back side of rim?

thx, jim

Jim,

Here where it measures from

Lee

 

[foxguy]

Jim,

Here where it measures from

Lee

This looks to be an Interesting gauge. It sounds like you use it to find the seating depth of rounds that your rifle likes. And then look for other lots with similar seating depths. Would this be true?

 

[Hi-NV Shooter]

This looks to be an Interesting gauge. It sounds like you use it to find the seating depth of rounds that your rifle likes. And then look for other lots with similar seating depths. Would this be true?

Yes that is the idea behind using it. using the gauge really showed why some lots were just plain junk as the lengths were all over the place one lot had 5 different lengths. my best shooting lot is so consistent in length I find maybe 2 or 3 that are different in a box and it was only 0.002 different.

Lee

 

[buckeye68]

I tried to find this gauge on the Neco site and had no luck. Is there a part number or specific name for it? Thanks,

MK-II PRO OGIVE TOOL - Back in stock! , NECO Shop Online | Neconos.com

This MK-II Pro Otive tool is used to determine bullet seating depth in relation to how far the actual rifling will make contact with the bullet. Seating depth not being changeable with rimfire rifles, knowing your seating depth is important in determine how any given ammo will best perform in...

www.neconos.com

 

[USMCDOC]

Jim,

Here where it measures from

Lee

i knew you would already have pictures

 

[holstil]

I’ve thought of making a tool like this before, then I shot some center x and the accuracy met my needs. Now I’m interested in finding other Ammo that shoots as well or better due to availability if not for accuracy. I’ll revisit Ammo I tried before when I make the tool.

The tools I made for the bullets I make are similar and is why I was curious what rimfire folks are using for datum.

 

[Hi-NV Shooter]

i knew you would already have pictures

You know me, I am one of them guys who like looking at the pictures versus reading

Lee

 

[grauhanen]

Lee, is the base to ogive gauge used by most serious BR shooters? What percentage regularly use it?

 

[PatMiles]

i bought what was left.. two cases

TWO cases!
This just proves that you are indeed a hoarder. You sir remind me of...ME!
Best to ya!

 

[holstil]

You know me, I am one of them guys who like looking at the pictures versus reading

Lee

I like pictures too.

sometimes pictures and descriptions are different

 

[USMCDOC]

TWO cases!
This just proves that you are indeed a hoarder. You sir remind me of...ME!
Best to ya!

i figure that it should last me 4-5 years if i just use it at the 100 yard line

 

[USMCDOC]

Jim,

Here where it measures from

Lee

Lee,

Which digital indicator are you using.. i wonder if an Igauging absolute would be good enough

 

[dellet]

No photos, so apologies to the picture readers

I used a 22 barrel liner and cut off a piece 2" long.

Reamed one end like a long chamber to drop a round in and measure rim thickness.

Short chambered the other end using a basic "match" 22 LR reamer and use that to measure base to ogive.

Can be used either with calipers or mount a dial indicator in a stand to use like a snap gauge. I prefer the the dial indicator because it is consistent light pressure, not enough to damage the leading edge of the band on the bullet that touches

This allows sorting for headspace and engraving depth with the same tool.

Sort by weight and call it good.

 

[PatMiles]

Lee,

Which digital indicator are you using.. i wonder if an Igauging absolute would be good enough

Doc,
Which model number are you asking about

 

[USMCDOC]

Doc,
Which model number are you asking about

Store Temporarily Closed for Maintenance

 

[PatMiles]

Store Temporarily Closed for Maintenance

You might want to give Gerry a call,(860)354-7500, and ask him if the tool takes 3/8" shank diameter dial test indicators. Nice fellow, loves to talk.

 

[USMCDOC]

You might want to give Gerry a call,(860)354-7500, and ask him if the tool takes 3/8" shank diameter dial test indicators. Nice fellow, loves to talk.

i would have to text or email.. my hearing is such that most times.. it is very difficult to be able to talk to someone on the phone.