The velocities used on the 6.8 loads in the chart are probably taken using a SAMMI chamber with a 1/10 6 groove twist. Using a barrel with the proper chamber and twist could likely increase velocities a notable bit.
I have SPCII chambered 1/10 6 groove shooting factory 110 gr VMAX and had velocities that were 60-80 fps faster. In my 20 inch DMR chamber 1/12 3 groove I was getting 170-200 fps faster with the same ammo. Of course an 18 inch would be a little slower but definitely faster than the velocities CaseyJ had to work with.
Here is what SSA shows for their 90 gr TNT load - 6.8 SPC 90 grain TNT Practice or Varmint Round, Ammunition, 20 rounds/box
</META></META></META></META>2,900 FPS from a 16" Barrel Excellent accuracy
And the price is about $16 a box if you buy 25 or more boxes. If I hadn't just spent all my money on a new refrigerator for the house and some needed parts on my truck I would be laying in about 30 boxes myself at that price.
I have SPCII chambered 1/10 6 groove shooting factory 110 gr VMAX and had velocities that were 60-80 fps faster. In my 20 inch DMR chamber 1/12 3 groove I was getting 170-200 fps faster with the same ammo. Of course an 18 inch would be a little slower but definitely faster than the velocities CaseyJ had to work with.
Here is what SSA shows for their 90 gr TNT load - 6.8 SPC 90 grain TNT Practice or Varmint Round, Ammunition, 20 rounds/box
</META></META></META></META>2,900 FPS from a 16" Barrel Excellent accuracy
And the price is about $16 a box if you buy 25 or more boxes. If I hadn't just spent all my money on a new refrigerator for the house and some needed parts on my truck I would be laying in about 30 boxes myself at that price.
