I've done it, but I didn't have a rifle in the original caliber of the headstamp, so there was no danger of mix ups. And I never leave brass behind so no one would be picking up brass that didn't match the headstamp.

I've done plenty of 270>30-06, 308>708, etc. It doesnt bother me.

I made quite a few 300 blk cases out of lake city 5.56 brass for by first 300BO.

It bothers me. Another thing that drives me crazy but shouldn't is cannelures above the neck of the cartridge. I've loaded bullets with cannelures long but it still makes me crazy.

Doesn’t bother me a bit I loaded the 277 wolverine from 223/556 brass and now loading 224 predator from Grendel brass pay attention to what you’re doing

I have used brass to make brass for cartridges I could not find brass for quite a few times and still do, not going to find 22-243 brass without making it from something or paying out the nose for custom brass and that is just one. Some would be hard to confuse like 30 and 357 Herrett, 7mm TCU... The only one I have loaded for someone else a friend ask me to load some for his 6.5X57 and I have to say that old rifle surprised us, an Ariska that started as a 6.5 Jap and had been chambere to 6.5X57 easily had it shooting under MOA. He used those oads for Whitetail and hogs in Texas and mule deer and a Gemsbok in New Mexico.

I have done it and will continue to for some rounds but make it a practice t never leave brass behind with them.

My guns and me only. I know what is what and what goes in who.
For example my .338 Edge is a custom round developed my necking open a .300 RUM to .338. All brass head stamp is .300 RUM.
New shooters and inexperienced people no way.

To date, I have not reformed any brass. I am saving all my .223 brass as I load 300BLK now. I don't plan on reforming it, but I will do it as a last resort. As far as purchasing ammo with reformed brass. I would exhaust all other avenues before doing that. I think the liability points made above would be the main reason why I would not do it if I were going to start producing ammo commercially. The only commercial ammo that I have seen made with reformed brass with incorrect headstamp is 38-56 (not 38-55, that is not a typo) made from reformed 45/70. But that is an extremely outdated an irrelevant round now. And I didn't buy it.

edit: the only thing that I would consider as an exception would be AI brass. i.e. if I had a 260AI, I would want my brass to be fire formed from 260 ammo. Not 308, formed to 260 then fire formed to 260AI

I'm confident that I could do it without creating a dangerous situation for myself, so that part doesn't bother me. However, I don't think my OCD tendencies could deal with it.

Absolutely would not sell ammo with the wrong head stamp. We live in a world where peopl eat Tide pods and car batteries have warnings that say “don’t drink the battery acid.”

If it is your personal handloads for you only, sure why not, but if the possibility of it going into someone else's rifle exists, then what? a .243 round in a .308 marked case gets loaded in a .308. maybe nothing will happen, but if they do that reversed and shove the bolt home, it could lead to bad juju.

If I was doing it for myself, it’s alright, not the best scenario but I’ve done when I needed to. I wouldn’t recommend doing it for somebody else.
I once made some 270 from 30-06 and was trying them out. Had a buddy come to sight in his rifle, I wasn’t paying attention to what he was doing, he would load his 30-06 mag with my ammo while I had my back turned. He was using a semi auto Remington. He couldn’t get it to cycle and couldn’t hit the target. He finally got frustrated and left about the same time I figured out what he was doing. Needless to say but he had a very range trip.

Pm incoming

I thought this was about mis match head stamp like different manufacturers for the same caliber. That chit gets on my OCD nerves. Can’t keep from it these days because gotta buy once fired brass online. Fire forming from a different caliber would send me over the edge.

It only bothers me when it’s not all the same not because of lettering or numbering but due to inconsistency in case volume which leads to inconsistency down range. I have one rifle that before lapua made 260 brass I used 243 win but that’s the only rifle that brass has seen.

I have 4 rifles that I use different brass for the cases.
243 Win for my 260 Remington cases since I don't shoot a 243.
270 Win for my 6.5-06 cases since I don't shoot a 270,but do shoot a 25-06 and 30-06.
6.8 SPC II cases for my 6.5x6.8 AR wildcat, but they are shortened .060", so it's easy to tell them visually from my standard 6.8 SPC II cases.
6mm CM cases for my 22 CM. The factory 22 CM offering's just didn't have the same performance #'s.

In a pinch I’d do it for myself. I don’t like mixing brand head stamps let alone caliber.
When I get a bunch of mixed brass of the same cal. I’ll sort it all out and load it up by head stamp.
Just OCD for me I guess

Spent a night in the hospital with my brother who loaded a .270 into a .30-06 and pulled the trigger.. took 6 hours of surgery to pull the metal and wood out of his face. Very lucky he didn't lose his eyes.

From that day forward (20 years ago), I take a shell out of the box, read the stamp, and load it. Doesn't matter if I have to turn on a flash light to read it. If it does not match what is inscribed on the barrel, it doesn't get shot.

Never risking that again, and my kids won't either.

How so? I have fired 25-06s in my 30-06 a couple of times by accident with no harm. I don't see how anything pressure related could happen with a .277 down a .308 bore.

It was probably a 30-06 into a 270.

Yeah I had that backwards... 06' into a .270.

I agree totally with Jeff.

For me it isn't that big of an issue. I have 260 that I shoot that my dad necked brass down from 7-08. He understood the process, as do I , and no biggie. But when I die who knows if my kids or grandkids will, and it leaves potential for mistakes. From a safety issue it would just rattle a 264 bullet down a 284 bore with barn door accuracy. Won't blow anything up but sure could wreck a suppressor if someone wasn't paying attention. My opinion is that you never know where that ammo will end up down the road. People die, people forget things, it gets passed along to those that don't understand. Leaves potential for bad things to happen from the unknowing. Maybe there has just been enough death around me in recent years I think about things that way now.

Back in my younger days we did it all the time. I had lots of 30-06 that got turned into 25-06 as brass for it was hard to come by 40 years ago. It has all been long used up and replaced with the correct head stamp brass. I always kept my altered brass segregated to the correct containers when I reloaded it. Never mixed loaded ammo of different sizes in the same box, but I could see where an accident could happen.

I’ve shot quite a bit of commercial.300 Whisper ammo that had .223/5.56 headstamps. In the early days, no one made proper headstamped brass.

I have used 308 to make 7mm08 and i have used 7mm08 to make 260. No issues.