Time to continue load development with my .44-77.

[Distant Thunder]

It looked to me like it was a poor cut and paste/edit job. Says something about it weighing 540 grains and has wording similar to other "Arnie Seitz" designs. It does say it's an Arnie Seitz TYPE design.

At 1.320" it is at the upper end of the length for at 19-twist. The faster you can push it the better it would be for beyond 800 yards.. The design you came up with is a very good one for the length and that should help you for reaching 1000 yards.

I found that for my 17-twist barrel bullets that are 1.460" are a bit long for beyond 600 when pushed at 1300 fps. That's why I had Brooks cut my new one at 1.400". I might have been fine at 1.420" but I wanted to be sure it was spinning fast enough.

I know there is the whole stability factor thing and over a certain number is considered "over spun", but the number does not take into account the bullet design nor the conditions you're shooting in. I'm thinking a LITTLE over spun is a good idea when your bullet is getting slapped on the nose by those nasty, gusty head winds.