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Primer Type	Manufacture Date	Peak Chamber Pressure (PSI)	Muzzle Velocity (fps)	Energy to Pressure Ratio (fps²/PSI)
150	1990s	58,600	2747	129
200	1995	58,600	2743	128
250	1995	57,900	2732	129
300	1994	57,800	2743	130
9½M	1995	57,700	2731	129
155	1990s	57,600	2731	129
2½	1994	57,200	2728	130

Note remarkable consistency in energy-to-pressure progression. Particularly notice mild pressure and low velocity generated by Remington 9½M (Large Rifle Magnum). Again, CCI-350 (Large Pistol Magnum) is near top of list.