pricedu - Tom's not talking about nor wanting to be using 35,000 to 40,000psi loads (the lever actioned factory stuff you mentioned) in his rifle - just 1873-era safe rifle pressure loads, ie: up to 28,000psi. That level of pressure which is safe even in an 1873 Springfield trapdoor of decent condition, will be just fine in his Baikal.

Even at 28,000psi, he will be able to run to 2,000fps with 350's if using the correct powders, if he wants to. This isn't rocket science or questionable loading practises as there is a ton of good data available.