Thanks for reaching out James! This ammo is safe to fire in either of those firearms (if they're chambered for 45 LC, needless to say). I just asked Barnes to give me this ammo's pressure – I'll update this comment as soon as I hear back from them.
UPDATE: This ammo is loaded to 13,500 psi – just under SAAMI's max spec 14,000 psi. It's safe to fire in an SAA or any other 45 LC firearm.