You won't be able to push them out any further than factory on a Tikka magazine. 180 ELD-M is COL 3.32", you're not loading longer than that without flattening polymer tips. If you like to tinker and believe in seating depth nodes or chasing the lands, the Tikka platform probably isn't a great idea. But if you're okay with an arbitrary measurement like functional mag length and rolling with it, you might consider taking some bearing surface measurements of bullets you plan to test and shortening the freebore up to a suitable length for the sake of barrel life.