Prep of 22rf method?

[TAJ45]

I was sorting by rim thkns w gages, one being a PBike. Gave that up for concentricity. Now wanting to explore overall length to ogive.

Talking w several dedicated rf shooters here, one felt the rim thkns was more important than concentricity. In my mind this is a direct relation to freebore/OAL to ogive.

To check ammo with intent to OAL to ogive segregate, what gizzies are available? I have a 40X, 54, MDT to test with.

 

[wsmallwood]

I haven't sorted for rim thickness in probably more than 30 years. I tried it but never really saw a benefit. Unless RF cartridges are more consistent than the used to be it is very likely that you can get different readings simply by checking different places on the rim.

 

[TAJ45]

Allow me to be more specifice: With talk of adjusting head space by shimming the bolt, how do we measure base to ogive with end intent to engrave?

 

[Hi-NV Shooter]

I was sorting by rim thkns w gages, one being a PBike. Gave that up for concentricity. Now wanting to explore overall length to ogive.

Talking w several dedicated rf shooters here, one felt the rim thkns was more important than concentricity. In my mind this is a direct relation to freebore/OAL to ogive.

To check ammo with intent to OAL to ogive segregate, what gizzies are available? I have a 40X, 54, MDT to test with.

There isn't anything currently being made to measure OAL from the rim face to the ogive. you can put one together from what I understand using Sinclair components not sure what components.
but this was the best one when it was being made. knowing what your barrel likes as far as OAL and the ability to remove the outliers that are way different within a specific measure range which I found to be 0.015 as the maximum spread greatly reduces the fliers from the ammo. won't make it shoot smaller but more consistent whereas to know the hold off between measured groups of OAL. it has also shown me how much Lapua has improved year after year as my last sorted ammo had only two groups of with just 0.005 spread within each group and 0.015 overall between each group. I been sorting for over 10 years now using this gauge.

I am currently trying to get a manufacturer of gun components to make these again. their current schedule is too busy to look into making it.

Lee

 

[wkdickinson]

Someone on RF Accuracy said awhile ago - "the only people who sort 22rf ammo, are those trying to make cheap ammo shoot like expensive ammo."

However as Lee notes above, he believes it is worthwhile. Since you can no longer buy that tool, you can accomplish the same thing by making a "comparitor" insert with an ID that allows the bullet to enter to the first driving band. Then measure the OAL and subtract the rim thickness.

 

[Hi-NV Shooter]

Someone on RF Accuracy said awhile ago - "the only people who sort 22rf ammo, are those trying to make cheap ammo shoot like expensive ammo."

Cheap ammo is cheap ammo. but quality match ammo will show an improvement. last year was my best ARA UL shooting sorted ammo. I will say this with ammo being so hard to get sorting OAL at least will help with ammo bought blind. will it improve test center ammo yes, it will. if you have a lot that shoots great but has an occasional flier OAL sorting will find the source of those fliers.

Lee

 

[foxguy]

G3 MII PRO.

I would be interested in Purchasing One and give sorting a try.

 

[ArtinNC]

I don't see how the G3 MKii Pro works . I must be really slow today .

 

[TRSR8]

I was sorting by rim thkns w gages, one being a PBike. Gave that up for concentricity. Now wanting to explore overall length to ogive.

Talking w several dedicated rf shooters here, one felt the rim thkns was more important than concentricity. In my mind this is a direct relation to freebore/OAL to ogive.

To check ammo with intent to OAL to ogive segregate, what gizzies are available? I have a 40X, 54, MDT to test with.

Don't know what ammo you use, but you can take this to the bank........you're wasting your time.
All that baloney won't make mediocre ammo less so, zero impact on true match ammo, which is still lot specific, with..... it shoots or not and zero manipulations change that basic principle.
Everybody at one point screwed with rims, concentricity.......stuff now collects dust.
As far as OAL, maybe with some match bbl and/or chambers, neither of which you possess.

 

[TAJ45]

Art, as a retired toolmaker, l would think, from bottom of gage a dia maybe 2- 4 thou over for brass case, maybe tighter. From other end a bushing like insert bored to around .208-10". A non fragile wall thkns of .050" or more for handling durability. Heck, make it to nearest drill rod size to speed production.*
lt can not be thru bored as indicator needs touch point.

This fits over the .203ish nose dia but seats on the driving band shoulder. Of course a counter bored dia needs be incorporated for bushing to slide in.
Overall, a COMPARISON measurement is obtained.
Of course Cue Tips for wax n lead removal.

I checked several miscellaneous rounds and came up w .203 nose dia at band juncture and .222-.223 for driving band.
I did check some Red Box bases....all 10 were same so stopped checking.

* There l go thinking manual machining. Two passes at most to get the slip fit dia w CNC and less expense for mat'l. ;