Keep in mind that O'Connor used WW brass, and a powder funnel with long drop tube, which required shaking and tapping as the powder trickled in. There is nothing magic about 62 gr. but it is pushing things and if you have a tight bore or chamber, soft brass, a bullet with a long bearing surface, min. headspace or any number of other things, you could be at max pressure during fall temps. If you shoot those same loads during the summer you may see some symptoms of high pressure, which to me = risky. If your primers fall out, or your bolt handle is sticking, you are way overpressure.
forepaw
