Likewise, the .270 WSM kicks a little less than the 7mm WSM, … 65,000 .351 Win SL: 45,000 cup.280 Remington . For exam-ple, at a common sterilization temperature, 270 degrees C, the pressure shown on the steam table is 41.85 psi absolute. The .270 Win. The .270 may be a good all-around North American chambering in the minds of some, but to me it fell short because of the limited bullet weights available (now that has been corrected). In a hyperbaric oxygen therapy chamber, the air pressure is increased two to three times higher than normal air pressure. Its larger base diameter gives propellant gas a larger surface area to push against and a shorter bearing surface makes it a bit less resistant to being pushed down the bore of a barrel. However, if you are one who likes to push things a little, there is a real good chance of setting the lugs back in the receiver. If you are happy with max 270 Win ballistics any of the 270 mags will give those with reduced loads and no pressure and case life just this side of forever. The locking lug seats are a little on the soft side. handloads averaged nearly 69,000 psi, well over its SAAMI MAP of 65,000 psi. chamber pressure has been well established by experimental means. For instance, in rifles of the same weight and shooting bullets of the similar sectional density loaded to the same pressure, the .270 Winchester kicks less than the .280 Remington or .30-06 Springfield. The rifle manufactures design there actions around this pressure and add a safety factor of 100%. So if the highest rated pressure for a cartridge is 65,000 psi, most manufactures will design to 130,000 minimum but I don,t advise that you exceed the design pressure because you will be cutting into the safety margin. 60,000 .35 Whelan: 52,000 cup ... SAAMI Pistol Pressure Specifications (Maximum Average pressure) All Piezo measurements unless specified) ... Chamber & Cartridge Dimensions. In 26" barrels the 270 will see up to about 2950 with 150 grainers and 3150 with 130 grainers. Current Levergun Makers. The 270 Wby will see 3250 and 3450. As you can see, the calculated results are pretty accurate and closely reflect values you would expect. Steam tables always list absolute pressure, not gauge pressure. The .270 is a high-pressure round, higher by a considerable margin … I think one could use loads at 270 saami pressures with no issues. I have also had 270/308 Norma and 270/300 Win. The 1908 DWM seems OK with high pressure loadings with standard cartridges (270 Winchester). About Leverguns. When steam tables are used, a common mistake is to obtain a Under these conditions, your lungs can gather much more oxygen than would be possible breathing pure oxygen at normal air pressure. 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