Yeah but... given a choice,I'd take the slower 244 twist over my 80's 6mm V any day of the week. And if there are "early" slow'er twist,shorter throated 260's..... then sign me up for one of those too.
Speaking of 4350.... '68 R700 243 became a one load rig with 43.5g of that powder under an 85g Sierra BTHP. Just wasting time looking for any other load? The slightly larger brother 6mm dotes,as well on FB Sierra 100's with max IMR4350.
Just opinion.... but have been pretty consistent shooting R700's....
Remington,through the 50's and early 60's had hands on shooting engineers steering the ship,as those guys gradually retired,a new breed of engineer shows up. The whole "show" changed when the drafting machine gave way to computers. This is when bean counter "Business major" guys started being run through college in a very much,revolving door fashion. The problem was,that it didn't translate,or transfer of power very well,at all for a company that started "analog".
It gets even more complicated today.... the internet has "seeded" the notion that older 700's are better. I can make a compelling argument against that but won't.
Fiver,not any 4895 or 4198 loads in the above IMR manual for 45 or 44. The 44 mag pressures sure are up there though.... right @40,000.... sheesh!