Originally Posted By: GCMost folks keep the .45-70 Marlin to somewhere between 35,000 - 40,000 c.u.p., you are loading higher to the .450 Marlin pressures.
We're saying the same thing, but not... 40kcup is safe in the 1895, well documented and supported by several reloading manuals. The 300grn pill at 2400fps with H4198 in a 26" 1895 is at, or slightly under 40kcup.
Hodgdon lists a 24" barrel 45-70 "levergun only" load of 60.0grn H4198 under a 300grn pill at 2,424fps at 40,000CUP. Easy 40-50fps faster for the 26" Cowboy, in my experience. They also have the 250grn pill at 2487fps load over 56.5grns H4198 at 38.7kpsi (recognizing that 40kcup = 40kpsi, per the 30carbine correlation). Add 50fps for barrel length and his 2600fps load isn't really unreasonable.
You said it yourself - 40k is safe, and he's loading to 40k. The fact that you're loading 400grn pills at 1800fps, coming in at 30k or less is "safer," but he's/we're still within the proven tolerance of 40k.