I think you're going to find that your .45-70 cases won't lengthen much, if at all, and they may even shrink a little bit.
Low pressure rounds like the .45-70 don't tend to lengthen much.
You may want to give them an initial trim just to make certain that they are all the same length, and then forget about it for a couple of firings.
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Smith & Wesson is dead to me.
If you want a Smith & Wesson, buy USED!
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