I bought a .243 Savage 110 a while back. Thinking it was a short action and not paying much attention. Got home and measured and realized it was a long action that savage just milled out for a short action magazine opening. Didn't matter being I already had a long action stock to use. Decided I'd use that action to make a 300 blackout. Couldn't find a long action .223 bolt head, just short action heads. Figured they'd be the same. Apparently not.
They short action has a shorter shank and the lugs are shorter. I lucked out that savage has an adjustable firing pin. Being an older model the firing pin hole was also larger then the new ones. So I bored out the head for the larger firing pin (not the tip but the larger shank), adjusted the pin length for the proper protusion. Also had to mill out a slot on the tail of the head. The bolt body had a tab for alignment that the new ones don't.
So any way, if you end up needing a long action .223 bolt head you can use a new style with a little work. Hopefully that helps someone out sometime.
It's also easier to dremel out the dimple from the bolt body than to mill a slot in the bolt head.
You could also machine a small spacer to make the difference in the bolt head tennon length. Then you wouldn't have to adjust your pin or swap pins when going back to standard and magnum sized bolt heads.
I have access to a few mills and lathes at work. Probably woulda took me longer to find my dremel in my shop. Saw PT&G made heads but didn't feel like paying that much for one.
The cost is basically $25 difference from the factory part - now do an activity-based costing of your time and effort and see if you come up ahead. Sometimes it's more cost effective to go with what's already available ... just saying .
I voted for my "FREEDOM", "GUNS", and "MONEY" - keep the change - UNK.
"I am always proud of my country!"
"Leadership Rule #2: Don't be an edited." - Maj Gen Burton Field.