01-05-2023, 06:05 PM
mdram Wrote:last 8lb drop of 8208 was 2 days ago at pv
edit:
this has a test for ar-comp temp stability in 223
https://www.wlcastleman.com/equip/shoot/t223/index.htm
AR-Comp: This newer propellant manufactured for Alliant by Eurenco Bofors AB in Sweden (RP-34TZ) has interesting temperature response properties and velocity consistency. The Eurenco Bofors powder catalog has temperature-velocity data showing that RP-34TZ has its fastest velocity at -29°C (-20°F) and slowest velocity at 52°C (126°F) with overall velocity variation being comparatively small to that of other powders across the temperature range. The powder had no significant changes in velocity between 66°F and 129°F in this study. The low standard deviation in velocity compared to most other powders offers the possibility that it could provide greater shot-to-shot consistency (accuracy) than Varget for prone shooting with service rifles between 300 and 600 yards.
I never seem to be at the right place at the right time for 8208.
Really, I should probably just stop trying to chase velocity, etc. With a 335-based SST load I had no problems killing a large doe at over 300 yards last month. It only chrono'd 2400 FPS out of a 20 inch barrel, but when the bullet hit the chest cavity she went down on the spot like she had been struck by lightning. I have good loads with TAC and 335 and these bullets. Maybe that is good enough.