After looking over the barrel OD specs and some traces i would stick to around 2500-2600fps MV with upto a 325gr bullet. That load is still completely adequate with good bullet selection.

If you go faster you will be into the 50+Kpsi range and/or having to use huge amounts of much slower powders. Even 3031 requires way more powder than 4198 to get the same speed......and i mean WAY more, like over 90gr of it.

That RemAge barrel is nice but its still not quite 1.1" OD. That is why i suggested a plain Rem barrel that would be around 1.2" OD for highend loads.