Probably less pressure than the guy shooting factory 303 British rounds in his Krag.
Maybe Parashooter could run quick load on the offending Lyman recommendation. I will be busy doing some planting the next couple of days.
Has anyone seen loading data for use in Ruger #3s or custom #1 single shots. The pressure and charge weights could be similar to 308 Winchesters I would imagine.
Passed on a #3 in 30/40 right after I got married, did not have the $85.00!