There is a reason why one should not use pointed bullets in a tube magazines..It is called magazine detonation and if you google it you will find out there have been more than one documented.

The ones I know of were from flat point hard cast bullets and a couple from a major 45-70 ammo maker(Not Garrett's) whom subsequently went to anti-slamfire primers(Military).

What's to be gained in a 45-70 by using led pointed bullets?First,the lead tips would be mangled through the cycle action and then there is the OAL issue the longer lead tipped bullets for the .458 Win Mag would bring for the levergun to cycle.

There is nothing but problems to be gained using led tipped bullets in the 45-70 and just maybe the loss of a limb or two.Not worth it.

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Jayco