Gordon, I don’t think your H4895 is quite as warm as you think. I’ve used the 180 Speer FN over H4895 for over 2,400fps, though backing off to your load gives effortless extraction/opening of the action of my Marlin M336C. My guess is closer to 44-45,000psi.
I however, have found the Speer 180 to be a bit “hard”, and much prefer the 200gr Remington Corlokts and Sierra 200gr ProHunters. 40.0gr gives just over 2,200fps and duplicates the 1930’s express load. It is also amazingly accurate.
Because of it putting extra stress and wear on some of the Semiauto guns, combined with the onset of WWII, Remington discontinued it.
Another misconception plaguing the .35Rem involves the trajectory. With the aforementioned load, sighted in at 100yds, the 200yd drop is a bit much, but if sighted +2.5-3” at 100yds, it’s only 5-6” low. I’ve connected with deer with several shots between 200-220yds, and it still surprises me how flat the old lead chunker shoots. My .358win BLR with a Hornady 200gr Interlock PtSpt is also sighted for 3” high at 100yds yielding a 200yd Zero, and 10”low at 300yds. 300yds is a LOONG shot in my neck of the woods. I’ve killed 2 deer so far this season. One was 75yds (w/.308MXLR), second was at 45yds, (Federal7/8oz Sabot slug).
After component crisis of Obama admin, I bought an RCBS 200gr FNGC mold. Loaded over a modest load of 39.0gr BLC2 it delivers 2,050fps at an as-cast weight of 220gr. Like your TTSX, It punches 1”holes through everything I’ve shot it at. However, I can make 1,000 of them for the cost of 50 TTSX. (Price of gaschecks). It’s hard to tell the difference between the 350gr ..540” 20ga sabot slug at 1,650fps and the .35 with the 220gr. Only the .35 hard cast FN substantially out penetrates the hollow point soft lead slug.