Brass predicament…

Going from .264” to .243” is so small it wouldn’t make a difference even in a minimum no-turn neck chamber. Have you run a piece of 260 brass through your 243 dies and measured the neck thickness? You couldn’t ask for a better case, other than the head stamp won’t say 243.
Yeah that probably is the best way to do it. And if I go with 260 I have Alpha and Peterson that make SRP. My only concern was potentially having to turn necks, but it’s good to hear that you don’t think that would be an issue.
 
Yeah I think you’re right. It’s amazing what kind of pressure you can run with SRP. With my 6GT and 260AI using SRP I had to start looking for other less obvious signs than the standard primer criteria that we are used to.
Which as long as folks are honest with themselves about it I have no problem, not like I don't run things hot at times, I just don't like that the realities of the SAW are kinda swept under the rug.

Also one potential perk on the 260 brass is if your chamber isn't a tight fit on regular 243 brass (like it should be) then starting with 260brass would easily let you create a false shoulder off the get go (vs necking up 243 first before necking it back down).
 
Yeah that probably is the best way to do it. And if I go with 260 I have Alpha and Peterson that make SRP. My only concern was potentially having to turn necks, but it’s good to hear that you don’t think that would be an issue.
Assuming you have a 243 die already just neck down a piece of that brass, seat a bullet and measure the neck to answer your question of what size it would be. The smith can tell you what the reamer is.
 
Yeah that probably is the best way to do it. And if I go with 260 I have Alpha and Peterson that make SRP. My only concern was potentially having to turn necks, but it’s good to hear that you don’t think that would be an issue.

Difference in circumference between 260 and 243 is .829 - .763. = .066” Which is roughly 8%.

If your 260 brass has .015” thick neck brass it would grow by about 8% to .0162”

Lapua brass is often .015”, Winchester .014” and federal .016”. Anyone know what Peterson or other brands are?
 
Difference in circumference between 260 and 243 is .829 - .763. = .066” Which is roughly 8%.

If your 260 brass has .015” thick neck brass it would grow by about 8% to .0162”

Lapua brass is often .015”, Winchester .014” and federal .016”. Anyone know what Peterson or other brands are?
I just measured the Peterson LRP at .0145”IMG_8444.jpeg
 
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