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Fair enough, can get some more powder in without compression also. Single feeding a 223 pain in the arse though!

The waterman mags are good, you can run 75 & 80's no problem. The Belmont factory...

73gr ELD's along with 75 bthps, 77 hpbt & 77 Tmks are all designed to function well in AR15 magazines so can be loaded to shoot accurately out of standard tikka 223 mag.

The 75 ELDM & 80's and old...

Don't get too tied up in trying to be such and such off the lands. Knowing Jam length is handy to stay right away from, may even be irrelevant as your mag may not allow it.

What you really need is...

1:8 twist shoots 80's ok but need to get them spinning with a decent charge. Heaps of options with 223, 69 & 77 tmk's seem easy to get to shoot well. Great hunting bullets just hard to find currently