02-07-2020, 03:27 AM
1Shot,
i think, i haven't run the series, that with fine granulated ball powders, you'll likely have the potential of higher MV than with 4895. Alliant Pro Power Varmint show near max velocity with most bullets when i look in the Sierra manual. however based upon my use of stick powders over the years, and a LOT of 4895, you'll likely, as you showed, get some of the lowest SDs on MV with these kinds of powders. my hypothesis is that even with a bit of compression, there's enough airgaps in the stick powder column that the primer flame has an opportunity to ignite more of the powder at once. with the tightly packed ball powders, i hypothesize that only the back half or so of the powder charged gets ignited initially, as the primer flames can't reach the front half. of course the burning powder near the primer will get the powder near the front burning too. so i hypothesize that you get more uniform powder ignition from round to round with compressed stick powders than with compressed ball powders. and uniform muzzle velocities helps to enhance accuracy.
-tdbru
-tdbru
i think, i haven't run the series, that with fine granulated ball powders, you'll likely have the potential of higher MV than with 4895. Alliant Pro Power Varmint show near max velocity with most bullets when i look in the Sierra manual. however based upon my use of stick powders over the years, and a LOT of 4895, you'll likely, as you showed, get some of the lowest SDs on MV with these kinds of powders. my hypothesis is that even with a bit of compression, there's enough airgaps in the stick powder column that the primer flame has an opportunity to ignite more of the powder at once. with the tightly packed ball powders, i hypothesize that only the back half or so of the powder charged gets ignited initially, as the primer flames can't reach the front half. of course the burning powder near the primer will get the powder near the front burning too. so i hypothesize that you get more uniform powder ignition from round to round with compressed stick powders than with compressed ball powders. and uniform muzzle velocities helps to enhance accuracy.
-tdbru
-tdbru