Here are the results of the latest session with the 12 FV 6.5mm Creedmoor mounted in the Oryx chassis using the 8-32x56mm NightForce Benchrest 30mm tube scope with Burris ZEE Signature high rings. The session was shot on Saturday morning, July 27th, in Northern Virginia at 100 yards at an altitude of 250 feet above sea level.

All the loads were shot using Lapua brass. All bullets were loaded to achieve a 1.361 msec. exit time (12th reflection) to stay under Pmax using H4350 powder and CCI BR-4 primers. I finally got some H4350 powder and I wanted to see how it would shoot in this rifle.

I have much more data using CCI BR-4 primers than Remington 7 ½ BR primers so I decided to start with the CCI BR-4 primers that have the most data to easily compare results.

The jump for each load was approximately 0.020 with adjustments within 0.003 made to achieve the desired exit time to account for variations in trim length.

The load description field shows the powder and charge, the O.A.L., the trim length, and the bullet exit time from the 26-inch barrel as well as temps expected and experienced, torque, stock, primer and pressure (from QuickLOAD).

# Grps -------Load Description -------------Bullet----- Wgt. – Vel. -- Avg. – Median – St Dev –-- 1 -------- 2 -------- 3 ------ 4 ---
4 ---- H4350 40.9 gr 2.832 1.907 -- Hornady ---- 147 – 2649 -- 0.286 – 0.282 --- 0.040 -- 0.241 -- 0.271 –0.293 – 0.337
--------- wf 1.361 71/71 deg.F. --------- ELD_M
--------- 60 in.-lbs. Oryx CCI BR-4 ------ #26333
4 ----- H4350 41.5 gr 2.856 1.905 –- Sierra -------- 142 – 2685 – 0.341 – 0.329 –-- 0.027 – 0.324 – 0.325 – 0.333 – 0.381
--------- wf 1.361 75/74 deg. F. ------- SMK
--------- 60 in.-lbs. Oryx CCI-BR4 ------ #1742
4 ------- H4350 41.3 gr 2.844 1.902 – Hornady ---- 140 – 2688 – 0.320 – 0.326 –-- 0.049 – 0.254 – 0.322 – 0.330 – 0.373
--------- wf 1.361 78/77 deg. F. ------- ELD-M
--------- 60 in.-lbs. Oryx CCI BR-4 ------ #26331 -------------------------------------------------
------------------------------------------------------------- Average -- 0.315 – 0.325 --– 0.043


H4350 powder averaged based upon the performance of the 147 grain ELD-M bullets but all three bullets managed to average better than the overall average through the last session.

Up until today, IMR4451 led the performance results with an average of 0.355, but since the H4350 results were with the Oryx chassis, it may be more meaningful to compare the IMR 4451 results shot with the Oryx chassis to the H4350 results. Although this is a small sample, there appears to be a marked difference (7.6%) in the performance of the powders favoring H4350. It looks like there will have to be more testing with H4350 powder to see if it will continue to show that improved performance.

H4350 IMR4451
140 ELD-M 0.286 0.346
142 SMK 0.341 0.335
147 ELD-M 0.320
 -------
0.315 0.341