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can’t we seat an extra long bullet (such as the 730) super deep? The link clearly says no (I assume due to crimp rings), but I am curious if there might be other options.
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The link doesn't say no, it just says that it won't cycle when loaded to the crimp ring. This is because the nose is longer than spec and the leverguns can't handle it. You could seat it deeper, but you'd have no crimp groove and would have to come up with your own load data from scratch.
Noebulletmolds.com recently made a mold for 500 and 600gr bullets that have a short enough nose to work in leverguns. Here is the 600gr mold: http://noebulletmolds.com/NV/index.php?cPath=42_588
Another option is to cut your cases shorter to fit an existing bullet to the crimp groove. Downside is the brass is only good for that bullet and it will leave a carbon ring like shooting special ammo in a 357/44 magnum. You'll also have to make up your own load data from scratch which may or may not be a big deal for you.
ETA: I've chased the heaviest subsonic bullets possible in 44mag and 45 colt. I got a 1895 only because it has a fast twist and heavier bullets are available. It's a losing battle - I shoot my cheap Rossi 92 most often now because it holds more rounds, is lighter, is cheaper to shoot, quieter due to lighter bullets, and overall more fun. Unless you really have a need for super heavy subsonic ammo I'd just stick with the cheapest jacketed bullets you can find. Shooting subsonic rounds at the range it doesn't make a difference what the bullets weigh and if you're hunting a jacketed pistol bullet will perform better on an animal.