223 barrel length 24 or 20 inch??

For what it's worth those 75gr ELDMs have great ballistics when you push em around 2900+ fps which is easy in a 26" barrel and should be plenty do-able in a 24".
 
I'm building a 223 right now for the exact same thing and I'm going to see if IBI will make me a 23" MTU with 1:8 twist, I think its happy medium lol. I dunno why, but I've always wanted a 23" barrel on a 223.
 
Haha interesting length. I always think in even numbers. 20” 22” 24” 26” etc lol... get an action and a prefit barrel from IBI
 
Well that’s not too bad. I went with wylde chambering for my new 223 build this time around so that would allow the use of Hornady factory 5.56 ammo too
 
Mike112288 said:
With only a 20” barrel?? I would almost think over pressure might happen then
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The throat length is more important than the barrel length. The RPR has a generous throat.

75 grain ELDs seat to about 2.535 OAL in the RPR and can easily exceed 2900 FPS, but if you run it there you are well within safe limits with Varget. I'd have to check, but I'm quite certain I run my RPR with 75s at 2,990 FPS. (For PRS max speed)I havnt shot it in a while since the new Defiance build. I'll probably sell it before long since I don't use it any more.

You want the throat to seat the bullet so the base of the bearing surface is just forward of the neck to shoulder junction, that way any donut that may form as the brass flows forward does not mess up your neck tension. It also means that you have maximized case capacity for the bullet being used, so you can get max velocity. To do that from a mag, you need to feed from an AI pattern mag, like what comes with the RPR.

So with that in mind, your mag is what limits the OAL and that's why I built my Defiance on a Rem 700 clone.... For the AI pattern mags. Now I run 88s and 90s closer to 2.6" long at 2900 FPS +.

If you neck resize with a bushing, don't bottom it out all the way down the neck, so you don't tighten up the donut area. Just stay high maybe 0.030" or so. Your chrony results will be better.
 
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Well I wonder if the wylde chamber will allow me to seat them out far enough to get that kind of speed. Those are impressive numbers for a 223!
 
Mike112288 said:
Well I wonder if the wylde chamber will allow me to seat them out far enough to get that kind of speed. Those are impressive numbers for a 223!
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Should be no problem, I ran my H4895 load over a Labradar and got a hair higher than the Velocity Hornady listed in their manual for 223 Service Rifle. I assume I'm in the 2825 fps range with RL-15 out of a 20" barrel from their 5.56 NATO loads, and these are loaded to ~2.258". 2900 should be a piece of cake with the extra 4", the extra COL from bolt gun/Wylde Chamber is just the icing.
 
Maple57 said:
The throat length is more important than the barrel length. The RPR has a generous throat.

75 grain ELDs seat to about 2.535 OAL in the RPR and can easily exceed 2900 FPS, but if you run it there you are well within safe limits with Varget. I'd have to check, but I'm quite certain I run my RPR with 75s at 2,990 FPS. (For PRS max speed)I havnt shot it in a while since the new Defiance build. I'll probably sell it before long since I don't use it any more.


You want the throat to seat the bullet so the base of the bearing surface is just forward of the neck to shoulder junction, that way any donut that may form as the brass flows forward does not mess up your neck tension. It also means that you have maximized case capacity for the bullet being used, so you can get max velocity. To do that from a mag, you need to feed from an AI pattern mag, like what comes with the RPR.

So with that in mind, your mag is what limits the OAL and that's why I built my Defiance on a Rem 700 clone.... For the AI pattern mags. Now I run 88s and 90s closer to 2.6" long at 2900 FPS +.

If you neck resize with a bushing, don't bottom it out all the way down the neck, so you don't tighten up the donut area. Just stay high maybe 0.030" or so. Your chrony results will be better.
Click to expand...



You didn’t have sticky bolt or Or flattened primers doing that?
The reason I ask is I just got my hands on a RPR in 5.56 and measured the lands and it’s sitting at AOL. 2.267 Comp 1.826 with
Hornady 75 gr hpbt match bullet
And compared to my Ruger scout rifle in 5.56 Lands Comp 1.970 A.O.L 2.415
Hornady 75gr hpbt
My RPR is tighter was gonna attempt Cfe223 and varget backing those 75s gr pills
However your info on the pressures might help me with my scout rifle cause it struggles to do better then 1.5 with factory ammo and when I was using BLC-2 didn’t have anything better then 1.5” groups with 55gr Hornady soft points so hoping to have better luck with the varget and cfe223 and 75 gr

Thanks for help and patience
 
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