New Thread - Remington 222.5

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P Corncob Bob

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Found a sleeved Remington 40X at local gun shop chambered in 222.5.

Any one know what this is? Parent case, shortened, etc.?

Thanks!

Cob
 
several versions

Cob,
There are several versions with the most common being a 222 reamer run into the length of a 222 mag. Then there are versions with a sharper shoulder...

I shoot a version that's a 222 mag reamer run into the 223 length. 223 brass is more common & the case capacity is very close.

But the short answer for you is: do a chamber case & see what you have.

Regards, Ron
 
P Corncob Bob said:
Found a sleeved Remington 40X at local gun shop chambered in 222.5.

Any one know what this is? Parent case, shortened, etc.?

Thanks! Cob
Click to expand...

Most 222 and one-halves were a .222 reamer, "run in", to split the length differential between the .222 Rem. and .222 Rem. Mag. - thus the "half", for half-way.:eek: Case capacity is about the same as a .223, but the .222.5 has a nice long neck. I had a couple of these, which shot quite well, using Win. 748, H-4895, and H-4198, in combination with 51 or 52 Gr. bullets. The last barrel I had, "liked" 28 Gr. of Win. 748 and 51 Gr. PCBC bullets. I used Herters Match .222 Rem. Mag cases (SAKO I was told - maybe someone knows for certain - it was very good brass) and pushed the shoulder back using a shortened .222 Rem. Mag FL die. For day-in-day-out relaoding, I used L.E. Wilson dies. Good shootin'! RG
 
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Cob

The 222.5 or 222 1/2 is as simple as RG described it. The 222R reamer is run in an extra .100" which makes the body 1.364", exactly between the 222R (1.264") and the 222RM (1.464).

But, it's always a good idea to make a chamber cast to make sure it's an original.

Ray
 
Chamber casts are neat, let you see neck diameter, shoulder diameter, freebore, leade, leade concentricity, etc. But they don't give you any info on headspace.
How does one determine what brass to use, case length and how to approach case forming or fireforming?

Jay, Idaho
 
Jay

I don't know how others do it, but on most barrels the case head is flush with the end of the barrel tenon, or close to it. Pour the cast so that it fills the entire chamber plus enough run over to include the cone or bolt nose recess. You can then get some pretty good estimates of case length and headspace. Not exact but close enough. Form your brass a little on the long side and keep setting the shoulder back until you get a good crush fit.

I'm sure there are quicker and better ways.

Ray
 
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