The jacket is thinner and the lead core is softer on 30-30 bullets to expand at the lower 30-30 velocities 1800 to 2500 fps. And normally the reloading manuals list the velocity range for their bullets.

Hornady has their pointed Flex Tip 30-30 bullets in 140 and 160 grain weights designed for 30-30 velocities.

Note, the same bullets labeled "Marlin Express" are designed for slightly higher velocities up to 2800 fps so pay attention to the box labels.

Hornady FTX Bullets 30-30 Winchester (308 Diameter) 160 Grain Flex Tip eXpanding Box of 100

https://www.midwayusa.com/product/1010479399/hornady-ftx-bullets-30-30-winchester-308-diameter-160-grain-flex-tip-expanding-box-of-100