The .270 is a high-pressure round, higher by a considerable margin … The 1908 DWM seems OK with high pressure loadings with standard cartridges (270 Winchester). handloads averaged nearly 69,000 psi, well over its SAAMI MAP of 65,000 psi. 65,000 .351 Win SL: 45,000 cup.280 Remington . In 26" barrels the 270 will see up to about 2950 with 150 grainers and 3150 with 130 grainers. Interestingly, not long afterward, Western also pressure-tested a bunch of handloaded ammo, put together by a major bullet company using a popular computer program for predicting hand-load pressures and velocities. The locking lug seats are a little on the soft side. The 270 Wby will see 3250 and 3450. 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. 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. About Leverguns. Steam tables always list absolute pressure, not gauge pressure. Current Levergun Makers. The Pressure value used for each caliber happens to be the maximum SAAMI safe chamber pressure. I have also had 270/308 Norma and 270/300 Win. 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. 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). .270 Winchester . 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. For exam-ple, at a common sterilization temperature, 270 degrees C, the pressure shown on the steam table is 41.85 psi absolute. As you can see, the calculated results are pretty accurate and closely reflect values you would expect. I think one could use loads at 270 saami pressures with no issues. In a hyperbaric oxygen therapy chamber, the air pressure is increased two to three times higher than normal air pressure. The .270 Win. When the same amount of pressure is exerted against 150-grain bullets in the .30-06 and .270 Win., velocity will be a bit higher for the .30-06 for two reasons. 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%. chamber pressure has been well established by experimental means. 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