Quote:
Originally Posted by edgarspencer
Without a top locking lug or cross bolt, cartridge is somewhat restricted to lower velocity/ pressures. As much as I enjoy 45-70, I think a flatter shooting round is more appropriate for this type of gun. As Brian suggested, there's nothing wrong with the old timers like 30-40 (.30 US), .303 British or .300 Savage. For simplicity, I'd stick with the rimmed cartridges, but don't I wish that action could handle .375 FNE.
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Edgar,
I did some calculations using Ellis Brown's formulas for building rifles on shotgun actions.
A 12g. shell with max average SAAMI pressures of 11,500psi ends up calculating to 7,086 psi of force against the breech face. That is a safe number given use of any factory 12g. load. Not talking proof loads.
I calculate the .35 Rem to be well under those pressures with force against the breech face being only 5,564 psi.
The 30-40 Krag calculates to 9,326 psi and the .32 Special is 8,441 psi.
So, based on the numbers, the .35 Rem looks like the best option.
I am sure that realistically the others would be plenty fine as well if one were to adjust the 12g calculation upwards to factor in proof pressures. But why push the envelope.