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Brian Pfleuger · November 20, 2013, 10:05 AM

You don't and there's no reason, from a safety perspective, that you can't run a .270 at .30-06 pressures.

I've run my .204 (SAAMI 58k) up to about 65k. I run my .243AI (58k in theory but no SAAMI limit) up to 65k too.

The brass doesn't know there's an arbitrary limit. It only knows pressure.

Fact is though, that last few thousand PSI comes with very little benefit. Check the velocity differences in QL between 58k psi, which is approximately where barrel erosion goes exponential, versus 65k, which is roughly where brass life becomes an issue. You're usually gaining 1% or so velocity for a 10+% PSI increase.

November 20, 2013, 10:05 AM	#12
Brian Pfleuger Moderator Emeritus Join Date: June 25, 2008 Location: Austin, CO Posts: 19,578	pressure and velocity You don't and there's no reason, from a safety perspective, that you can't run a .270 at .30-06 pressures. I've run my .204 (SAAMI 58k) up to about 65k. I run my .243AI (58k in theory but no SAAMI limit) up to 65k too. The brass doesn't know there's an arbitrary limit. It only knows pressure. Fact is though, that last few thousand PSI comes with very little benefit. Check the velocity differences in QL between 58k psi, which is approximately where barrel erosion goes exponential, versus 65k, which is roughly where brass life becomes an issue. You're usually gaining 1% or so velocity for a 10+% PSI increase.