AIA #4 M10 Ejection

[tiriaq]

I have used a carbide tool to create a bolthead counterbored for .223. Held the bolthead in a collet, c'bore was very concentric.
I would not be surprised if there were not a market for #3, #4, even #5 sized boltheads. Just increased .005" per step.
Something to consider if converting a Lee Enfield to a rimlless round.... There is a built in gap between the barrel face and standard boltface. If the boltface is counterbored, that gap should be eliminated. You don't want any more brass hanging out in the breeze than necessary. When I was experimenting with the .223 conversion, I fitted a ratty, salvaged Sako barrel, machined it to bring it back to the bolthead. Functionned well enough as a single shot, just never picked up a really good .223 barrel to experimant further.

Information

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[Alan de Enfield]

Article on converting a No4 to .223 calibre

http://www.surplusrifle.com/shooting/no4223/index.asp

[Alfred]

I have used a carbide tool to create a bolthead counterbored for .223. Held the bolthead in a collet, c'bore was very concentric.

I'd given that some thought. The bolt heads seem to have enough meat to them to allow a shallow counterbore.

A short list of sporting cartridges I considered for a No.1 conversion.

1. .22 Savage Hi Power (shortage of proper .228 diameter barrel blanks and difficulty finding bullets)
2. 6.5X57R ( that would be a great cartridge for local game from Deer down to Turkey and smaller game with reduced loads.
3. 7X57R for much the same reasons, both are porportioned nicely for the LE actions.

4. cartridges based on the .30-30 Winchester, the .30-30 due to wide availability and inherent accuracy, the .32 Winchester Special due to it being very well suited to handloading with a wide variety of propellants including Black Powder (finding a suitable barrel blank with 1 in 16 twist won't be easy, the 7X30 Waters a very versatile chambering, 25-35 Winchester could be given just enough power with handloads for the light White Tail Deer and be used with light loads or .25 ACP in an adapter for small game.

For now I'm leaning more towards a .410 repeater, a DP mag modified to feed the shotshell, with a .22 WMR liner and spare bolt for rabbit or squirrel.