20-223 imp?

[Blaster 1]

I'll throw some fuel on this fire, I have used Rem,Win,LC brass for my 20p. When I use a 0.225 bushing the bullet can/will more inward when loading off the magazine in my AR. Instead of dropping another bushing size or two(I would have to buy more bushings) I had Lee make me a tapered crimp die. A light crimp no more slippage. All the brass I have used measures 0.228- 0.2285 + - 0.001 with a seated bullet before a crimp.

Sherman if you want to sell that 20 practical reamer I'm very interested

 

[L.Sherm]

I don't use the bushing to fit a round to the chamber.

I'm confused what does that mean?

 

[L.Sherm]

Sherman if you want to sell that 20 practical reamer I'm very interested

I really don't want to do that, brass will not fit the chamber sized with a FL die just so you are aware of that.
Its full disclosure if you insist

 

[L.Sherm]

Sherman if you want to sell that 20 practical reamer I'm very interested

P.M me if you want, I'm done derailing this thread

 

[Oklahoma Jim]

I'm confused what does that mean?

One of the previous replies (post #5) said our technique for bushing selection was incorrect. He seemed to be trying to pick a bushing based on chamber dimensions instead of cartridge dimensions.

 

[Greyfox]

One of the previous replies (post #5) said our technique for bushing selection was incorrect. He seemed to be trying to pick a bushing based on chamber dimensions instead of cartridge dimensions.

Against my better judgement I'll reply. I have found best accuracy by fitting the cartridge to the chamber. I start with neck dimensions, then make the cartridge .002 smaller. Sometimes this means turning necks depending on the brass.
Most of my 20-223AI cases have been formed with IMI brass.
BTW- I don't "try" to pick a bushing. I choose a bushing. I might go smaller or larger depending on the accuracy I get.
I understood the OP to be saying he intended to make the brass before he had the rifle in his possession. IMX-that is a mistake.
Rick

 

[Coyotefurharvester]

GF you said your 20/223I has a .228 nk and you start -0.002 that would be 0.226. You could have agreed with the first post when he asked if starting with a 0.225 or 0.226 bushing would work with most brass. Myself I start -0.002 from a loaded round diameter. And I NEVER run with just 0.001 neck clearance, which is 0.002 smaller than the chamber neck diameter. Heck some of my rifles the bullet would probably just slip into the sized case by hand(depending on brand of brass) including a couple custom barrels with minimum SAAMI spec chambers.

 

[Greyfox]

GF you said your 20/223I has a .228 nk and you start -0.002 that would be 0.226. You could have agreed with the first post when he asked if starting with a 0.225 or 0.226 bushing would work with most brass. Myself I start -0.002 from a loaded round diameter. And I NEVER run with just 0.001 neck clearance, which is 0.002 smaller than the chamber neck diameter. Heck some of my rifles the bullet would probably just slip into the sized case by hand(depending on brand of brass) including a couple custom barrels with minimum SAAMI spec chambers.

You made me curious searched and I found everything. I misspoke about the neck size. It is a .227. The loaded rounds measure .224. I probably used a .223 bushing. I say probably because I haven't loaded any of these in at least 4 years. But, this is why I suggested the OP find out what his neck was before he made brass. AFAIK, there is no SAAMI spec on anything 204 other than a 204 Ruger. Neck sized vary all over the place. For example, I have .224 chambers with .257 nk and .243 nks as well as several in between such as a .250. The 20 cals aren't as popular yet and won't have as many variations....probably. But it is both safer and more sensible to know where you are starting from...IMHO. I will stick with that suggestion.

Rick

 

[Coyotefurharvester]

Probably just difference in our measuring equipment +brass prep(I don't need to turn necks). As all my loaded rounds measure 0.227-0.2285 ish. PMC/Win are smallest loaded dia. My custom crimp die seems to yield about 0.0005 smaller loaded dia, which is enough to allow loading and unloading unfired rds thru my AR with no coal change. My fired brass is mostly 0.231, figure 0.001-0.002 spring back my 20p chamber neck ID 0.232+. I would have to turn brass to have a 0.224 loaded dia.

 

[Gabe22BR]

I always get .002” smaller bushing than my neck is loaded…
Then .001” up & down in bushing sizes to take care of them odd batch brass

 

[shooter74]

My necks ended up being .226 I would trade my Whidden .226 bushing for a .224 if anyone would be interested. Thanks

 

[L.Sherm]

My necks ended up being .226

Do you mean loaded round is .226?
What brass are you loading?

 

[shooter74]

Do you mean loaded round is .226?
What brass are you loading?

No the neck cast at .226 using starline. Also .228 encore won’t close scratches necks, .226 necks are clean but are .203 after firing, .224 loaded fired are .204.

 

[L.Sherm]

What does the loaded round neck dia. with a bullet measure, im lost here.
Don't know what " cast or encore" is.
Is a loaded round with a bullet .228 and bolt won't close?
Are you sure your brass isn't to long or bullet isn't trying to jam to far into the lands?
If your sure of all that, sounds like to me you dont have a no-turn chamber, time to call the smith and ask for a print or what your nk chamber is.
Will a sized case chamber fine without a bullet seated?

 

[rcol317]

LSherm is correct! It's not rocket science. Gregfox is correct it's best to pick a bushing based on brass and chamber cut BUT, a .226 bushing is a safe bet. I use .228 on all my Lapua brass whether a 20 PPC, 20-223 AI, 20 VT, .204 Ruger. I don't like tight bullet seating but that's me. Let's not make this OVER COMPLICATED. Shooter74 asked a simple reasonable question. Good shooting everyone! I LOVE my little 20-223AI because it shoots 39 gr BK's over 4,000 FPS and its a PD smacker, Rick

 

[Coyotefurharvester]

No fired neck diameter is smaller after firing than the loaded (unfired dia).

 

[searcher]

I really don't want to do that, brass will not fit the chamber sized with a FL die just so you are aware of that.
Its full disclosure if you insist

I have a .20 P PTG chamber in one of my A/R's and it requires that I use a small base sizing die. It provides for a nice, tight chamber. Love it.

Regarding bushing size, I use three different bushings, ranging from .225, down to .223. I turn all of my necks to at least 90% clean metal. The difference for the variation in bushings relates to some brands of brass being a lot thinner than others and I want to leave as much thickness as I can when shooting it in an A/R. The .223 is predominately what I end up with using lake City brass (always the most thickness variation.) I use .224 with Remington and Winchester and .225 with Lapua.

 

[L.Sherm]

have a .20 P PTG chamber in one of my A/R's and it requires that I use a small base sizing die.

I'm not about to use a small base die when if the chamber reamer is what its suppose to be its not necessary, on my original 20P that was chambered with a PTG rented from 4D it was .3769 at the base when fired and it was perfect fit for a FL die just like my JGS one now.
1 pass through my 223 FL bushing die with a .226 and done.

 

[searcher]

I'm not about to use a small base die when if the chamber reamer is what its suppose to be its not necessary, on my original 20P that was chambered with a PTG rented from 4D it was .3769 at the base when fired and it was perfect fit for a FL die just like my JGS one now.
1 pass through my 223 FL bushing die with a .226 and done.

Yeah - I was initially bummed out about having to buy another die to get it dialed in - but have since learned to appreciate the tighter chamber as a good thing.

 

[L.Sherm]

What do you mean tighter? I'm good with .0017 chamber clearance target tells me I'm good, I believe the PRC's gotta have .004 or more to get away from clickers.
Tighter is not always better.