Rem700 Mag Options for .223

[BigDog00]

I'm putting together a .223 trainer based off the 700 footprint. My action is cut for a wyatts extended box (Bighorn SR3). I've been trying to figure out what my options are for the best/longest OAL. Wyatts has an internal box that goes 2.430, but I'd like to be closer to 2.50 if possible. I know I can go DBM and get there with an ACIS style mag. I've heard of pulling/modifying the spacer in the factory internal magazine but not sure if that's an option with the Wyatts (I can't find a factory mag box). My stocks inlet is for BDL floorplate but I can get it opened up to M5 if needed.

I'm leaning towards .223 AI chamber if that makes a difference. What other options are out there?

 

[83cj-7]

I have a bunch of experience with this issue working with 6x45. You can absolutely cut out the spacer on the Wyatt’s and move it back. The follower will float a little bit but feed okay.
Hands down the best way to feed a long 223 based cartridge is with a Hawkins Hunter magazine. The MDT 10 round mags also feed really well if they lockup tight. Both mags feed AI rounds pretty darn well too. My MDT didn’t lock up real tight so I welded the latch and made it .040” longer (See last picture). It works perfect now.

These are 2.475” and feed flawlessly:


Same in a MDT:

 

[BigDog00]

Appreciate the detailed reply. I may just get the wyatts box to start out then look at the DBM options down the road or try to pick something up off the classifieds. Whats the best way to cut out the spacer?

I need to get the barrel ordered and measure the chamber once it gets cut to see how long I actually need.

 

[83cj-7]

The spacer will be held in place by several tack welds. Use a grinder and lightly grind the areas where the welds are. You should then be able to see the exact holes that they welded through. Use a drill bit and drill about half way through each spot weld. Then pry the spacer out and weld it back in place where you want it.
Who do you plan on doing the barrel? You can have the smith who chambers the rifle cut the freebore such that you don’t have to go through any of this. Just a thought.