45-70 Load

[Deer_Hunter]

Working up a 45-70 load for Elk/Moose/Deer

I want to use a monlithic bullet - so considering either:
Barnes TSX 250 Gr
Barnes TSX 300 Gr

I have a slight bias towards the 250 gr right now - two reasons:

1 My experience with the Barnes and all monolithics has been that they open more reliably with ample speed.

2 Generally my shots are pretty close (like 100-200), but once in awhile something a little further presents itself so wanted to have the advantage of a marginally flatter trajectory.

Not sure if that is sound logic but right now that is where I am presently.

I generally rely on just the published load data from Barnes and then ladder test to optimize the propellent charge.

This time I decided to cross check through Gordons Reloading tool.

When I look at the load data from Barnes and then cross check this through GRT I am consistently getting over pressure and slow burn warnings.

Looking to hear from anyone who might have loaded a 45-70 in either of these bullets.

Also if anyone knows if GRT is generally more conservative than Barnes published data.

Thanks to all