I don't think there is an "ideal" leade length because of the differences in bullet shape. SAAMI prescribes one.
Attachment 4642
If you can keep a 0.015" jump and fit the magazine it's all good. Longer C.O.L. just means you can fit more powder. ;-)
I have a .260 Rem (.243 up to .264) and I use 2.890" O.A.L. on the 143 gr. Hornady ELD-X. Happily Savage gave enough magazine to get away with that.
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