Yeah, your only option really for long action T3 bottom metal is CDI, that's what I'm running. I like it good enough, no complaints. Long action AI mags I'm running a 5rd Accurate 3006 mag and 2 heavily modified AI long action mags. 3006 Accurate mags have a built in stop at the front and work great for keeping bullet noses from catching under the feed ramp, but they only come in 5rd capability. I modified my two 10rd AI mags with a spacer in the front to do the same thing. I can post pics if anyone is interested in this. It limits the mag length to fit the opening in the bottom of a Tikka action, which is shorter than the AI mag system.