I've shot/shoot moly in over 100 of my own barrels and have yet to see a downside...but I'm of course all ears and look forward to naysayers.(grin) Pards are good for a few hundred more spouts,if only as a gross understatement and I'm thinkin' all case capacities and bore sizes,are more than comfortably covered in the extrapolation.
I know,I know...it's hygroscopic too and the bane of a "moist" climate. I love all of that schit,which is why I reside in the Desert at a lofty elevation as a safety net! Laffin'!
Now as to a SAAMI 243Win and twist rates,both Rem and Ruger will easily stabilize 105's and are routinely throated nicely in conjunction with their magboxes,so as to allow a VLD 'Max kiss. Them is good things.(hint)
'17 is a very nice way to fly in the SAAMI hull with 105's,but I jump to '22 in the AI version with same.
(addendum for 'smoker)
42grs of '17 in R/P hulls lit with 200's and a moly 105'Max kiss,makes right at 3K fps in a SAAMI chamber/OEM spout...though a guy could certainly lean harder on 'em. ES/SD is in the 10fps realm,with .003" neck tension.
(Re-addendum for works)
Now saltwater and hard use in a wet climate,will affect CM parts/pieces and that's for certain...why is why I [bleep] HATE same. The Rocktucky had an OEM CM follower spring puke the other day,though it's bore hasn't seen so much as a mop in 1500rds + of 75A-Max. I've broken springs before,but never into 3pcs,which is currently my "record".(grin)
I remain a fan of shooting bores dry and the use of multiple applications of tape,throughout the day,upon muzzles.
Also a fan of an opening stance that states: "My Gunsmith says...". Cracks me the [bleep] up,that folks who cain't even shoot enough to inform themselves,feel compelled to give "answers" to others. Dumb [bleep] couldn't knock the new offa used pair of boots.