I guess I don't understand the question, as I don't know what crimping has to do with anything? My answer is, yes you can use any .308 diameter bullet. However, many .308 bullets may not work with your 340 depending on what you're trying to do.
With most spitzers to get anywhere near the lands you're going to have to load the rifle as a single shot, the exception being the 140 & 160 grain FTX bullets by Hornady for the .30-30. To get some spitzer bullets to fit the magazine you may have to trim the necks so far back your seating die couldn't crimp them anyway. Getting most spitzers to fit in your magazine is going to require a long jump to the lands, which may or may not give you acceptable accuracy.
No crimping because the 340 has a box mag, not tubular so I don't have to worry about recoil shoving the bullets into the cases.
My plan was to get help working a load with some 125-150g spitzers. Not finding much data for that since 99% of the 30-30's of the world are lever guns, and pointed bullets will not work other than single shot-shooting. I wonder if data for the single shot 30-30(Think Ruger #1 or NEF) would work for my single lug bolt gun. I worry a little bit about pressures, and what the bolt can take.
I found some data on a Sierra 125g FN-HP, 36.0g RL-15 should get me 2550fps and is proven for sub moa groups on the 340, so I might just go with the flat nose if it shoots that good. It should have a good bearing surface with the 1/12 twist