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Is this common for lever guns to stretch the brass this much ?
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Lever guns chambered for 'forgiving' rimmed cartridges, like .30-30, do tend to have sloppy chambers. And factory ammo for .30-30 tends to run at or below SAAMI minimums, which exaggerates things.
However, H&R/NEF single-shot .30-30s tend to be the most common source of brass fired in
really sloppy chambers.
If you bump the shoulder back and keep it there, the brass should be just as good as anything else.
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Full length resizing is all you need to do. Lever actions require FL resizing every time anyway.
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And the .30-30 headspaces on the rim, not EVER on the shoulder.
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Nope, and nope.
Lever guns can be run just like bolt actions. Depending upon the load, brass, chamber, etc., neck-sizing may be all that's necessary Take it case-by-case.
.30-30 can quite easily be set up to headspace on the shoulder, by a reloader that knows what they're doing - especially if using brass that has minimum-spec rims, in a rifle at or near maximum headspace. Doing so greatly reduces case stretch, prolongs case life, and can improve accuracy.