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223 reamer questions

Is there a reamer, that will allow you to to seat a bullet just outside of where the donut forms say for 70-85 gr bullets?

will the longer throat and free bore tolerate the 55 gr varmit bullets?

has anyone used a uni throat reamer to set the free bore?
 
I have a Criterion 223 remage barrel from NSS it has a "223 Rem Match" chamber (long throat)
dont know about the 85 gr bullets but the berger 75gr bullets are seated above the neck shoulder junction.

Call them and ask them what the throat length is, I know its pretty long like .090 but
dont remember.
 
Is there a reamer, that will allow you to to seat a bullet just outside of where the donut forms say for 70-85 gr bullets?

will the longer throat and free bore tolerate the 55 gr varmit bullets?

has anyone used a uni throat reamer to set the free bore?
I have used the uni throat reamer on my .223 that the throat was to short for 90 gr. SMK. I rented it from 4D reamer for like $40. Just be very careful you don't take to much as it cuts really fast and easy. I used several dummy rounds with the bullet set way long to use for measuring my cuts. I also used the Hornaday tool but the dummy rounds were more consistent.
 
Take a look at the ISSF reamer it has .169” free bore IIRC This will be good for the heavier bullets up to thee 85. Still a little short for the 88-95s It is going to be a jump for the lighter pills but if you want to shoot that wide of a spectrum you will need to compromise somewhere
 
I have two reamers for the 223.

The first reamer machined the free bore to 0.190, which I calculated to be about right for the 88 ELDMs. Which was about right.

Then I realized that it was difficult to control the free bore diameter when cutting the body at the same time. As a result the free bore diameter finished much larger than spec.

As a result of that sloppy free bore diameter, I could not reliably shoot groups any better than about 0.500" at 100 yards.

So then I ordered a new chambering reamer that just barely roughs out 0.120 free bore, that way I could come in with a dedicated throating operation later. By isolating the throating, it allows me to optimize feeds and speeds for the smaller diameter and minimize the dwell time so the reamer does not cut oversize.

I got two throating reamers in slightly different sizes. Throating reamers are not very expensive and I feel its cheap insurance to be able to get exactly what I want.

This way I could go in with the first at 0.2242" diameter and if it cuts a little over size I would be about where I want it.

If it ends up too tight, I could chase it with my other throating reamer that measures 0.2244" diameter. That would ensure it does not constrict a bullet when chambered but still be as tight as possible over the diameter for max accuracy.

The added benefit of course is that I can set my free bore length anywhere I want.

People always talk about free bore length but for some odd reason, never discuss the relevance of free bore diameter, which is critical to accuracy with long VLDs.

For 223 I want my loaded rounds to be 2.650 OAL. That's fine for a single shot rifle but feeding from a mag is the next problem I had to address. For that I like either the metal MDT 223 mags or the AccurateMags for 223. Both are easily modified to feed rounds of 2.650... I have a video posted on my youtube channel showing how to mod the mags.
 
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