[Test_User]

Actaully it is less or no more then any of the other rounds. You have to remember that SSA only uses one powder for all 6.8 loads. Normally with lihter bullets you use faster hotter burning powder and that is why there is increased throat erosion. This is of course because a lighter bullet will be farther down the barrel sooner and we tend to us a faster powder to maximize the performance from this. With SSA ammo its the same powder now more of it but that same powder is also exposed to more barrel surface are meaning less erosion. Also with the lighter bullet th powder is actually burning slower as there is less pressure to move the bullet compared to a heavier bullet so there is less heat concentrated as well. Further the heavier the bullet the more it wears on the leading part of the rifling.This is why faster twist barrel's throats wear out quicker as the bullet sides a bit when it first hits the sharper angle. Now there maybe more port erosion as there is more powder going down the barrel with the bullet but the middy instead of carbine port location helps greatly with this.

 

[Test_User]

Its low as its directly tied to weight

The formula for sectional density is weight( in pounds) of the bullet divided by the diameter (in inches) squared.

Bullet is actually .276 in diameter

1 grain = 0.000142857143 lbs

85 grains = 0.012142857155 lbs

0.276² = 0.076176

0.012142857155 / 0.076176 = 0.159


85 gr TSX Sectional Density= .159

 

[Test_User]

Your welcome. When you do get them let us know how they do. Even if you don't have a chrono etc just groups and your opinion is always welcome if you do all the better.