338 SnipeTac rifle
Viersco custom repeater action(3 shot), stainless steel
Barney Lawton stainless barrel, 33" 1x11.25 twist
Holland style brake
Lone Wolf carbon fiber stock
6x24 IOR 35mm tube scope
Tuned rem 700 trigger
Total weight 16.75# with magazine
Cases formed from 408 CheyTac necked to 338cal
Neck length .350
H2O capacity 165grns
Overal length w/ 300MK bullet 4.150 (touching lands)
Today i did some testing with US869 powder, 300MK bullets.
The cases were blank fire formed before starting.
The first test was 147 grns of US869 Hodgdon. Bullet was seated to just touch lands. Group was .750 at 100yds, no pressure signs. The chronograph was set at 10 feet from muzzle. Three shots were, (3426 clean bbl), 3454, 3464.
Next three shots i bumped up the load to 150grns of US869.
I did not clean. 3505, 3525, 3520. The first two shots cut an oblong hole, third shot was just off a bit, could of been me? As you can see in the pics, my bench is very poor. The group size was .533 Extraction was easy, shows some signs of the primer starting to flatten. Maybe able to bump up the load to 152. Temp outside was 65deg. Light wind from the left. Recoil was moderate, i could shoot this all day. I feel 3500fps is plenty fast and i am going to call this my top load. I'm sure i could get 3550-3600fps, if you wanted to push it to the limit, you may also cut the barrel life down and loose some cases. Remember this is a carry rifle for hunting. 3500fps with the 300MK bullet is very impressive out of a 33" tube.
I'm hoping to test some 350grn WC bullets tomorrow.
Pic of 100yd target, 150grns of Hodgdons US869 powder, 300MK
Pic of rifle on my portable bench