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Do not try to load the 75 Sierras to the same length as your 100s. The ogive shapes are different so you will not be duplicating the jump to the rifling. Seat them with a minimum of 3/16" in the case neck for safety. Your shallow seating is asking for trouble, either the bullet tipping or falling out all together. Sierra recommends an overall cartridge length of 3.025" with this bullet, versus 3.130" with their 100-grain bullets.
BTW, Sierra lists a max load of 50.5 grains IMR4064 with this bullet.
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