I just deleted an interloper who answered before me. That's a no no on this forum, and your answer better be solid scientific fact if you put one in after I give my answer. Please read the name of this forum, it says it all.
I recommend a 280 gr LFN, and it will need to be gas checked to get good speed with top accuracy. Best to slug the chambers/barrels of both guns so we know exactly what you need. That's the only way you can be sure the first mold you buy will be the perfect performer. You are absolutely right in not wanting to buy several experimental molds. If finances are the only reason you made that decision, you are fortunate to be forced, because experimenting with a bunch of molds, not knowing if one is right, is the most expensive and discouraging waste of time a bullet caster can get into.
Take your time and do the measuring, and I'll cut a mold that will outshoot anything you can lay hands on by experimenting.
As for feeding out of the clips, the only way to be sure is to have me send you a couple sample bullets. You load a dummy round with the bullet seated so it feeds smoothly in both rifles and I'll cut your mold with a crimp to match. You can't get more custom than that, and performance will show with the first rounds you load.
