Not just that but the volume is going to be drastically different. If you're used to reloading then you'll know that different hulls have different volumes. 2 oz of lead will take up more volume than 2 oz of anything heavier than lead. ASSUMING the pressures didn't change, you're still stuck in a situation where you're going to have leftover space in the hill that's going to require filling in order to get the proper crimp. If you're just using new hulls that are already loaded, find out who manufactured the hull and then follow the proper load data. Don't make the assumption that all Winchester and Federal hulls (or any hull for that matter) are manufactured by the company that had their name stamped on it. I'd almost bet my next paycheck that the vast majority of what's being shot today is made by Cheddite. And those aren't the same across the board. Their 2-3/4" hulls are all over the map and I'd bet that's the same with their 3" too. Just throwing it out there.
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