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I'm not too sure why your loads "have" to fit the magazine. I never did fireforming except single-shot.
That's what I recommend. Hand-feed them into the chamber one at a time and fire. I didn't even bother aiming when I did it, just worked the action while the gun was on the rest - pointed at the backstop, of course.
I even used super cheap military 55 FMJ bullets for the job. They didn't stabilize, but I didn't care. Most manuals have loads for 50-grainers and you can use a START load safely with the 55s. Seat the bullets so you get a firm fit in the lands, as you described.
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