I have big velocity variances, well they started out big. I did my research, got a new 0.338 bushing, and went testing yesterday. The original 20 rounds got bumped to 35. The 5 round groups were a last minute addition. Adding dry lube (Imperial) to the bullet and inside of the neck does not appear to be effective. Hopefully brushing the inside of the neck is my solution but needs to be tested again with a larger sample size.
| Rifle | ||||
| Projectile weight | 168.0 gr | |||
| Average velocity | 2591.5 FPS | |||
| Minimum velocity | 2582.3 FPS | |||
| Maximum velocity | 2605.6 FPS | |||
| Standard deviation | 7.9 FPS | |||
| Extreme spread | 23.3 FPS | |||
| Average power factor | 435.4 KGR-FT/S | |||
| Average kinetic energy | 2504.9 FT-LBS | |||
| Session notes | N540 43.7 338 neck 2.797 | |||
| SHOT # | SPEED (FPS) | DEV/AVG (FPS) | KE (FT-LBS) | POWER FACTOR |
| 1 | 2595.1 | 3.6 | 2511.9 | 436.0 |
| 2 | 2582.3 | -9.2 | 2487.2 | 433.8 |
| 3 | 2593.8 | 2.3 | 2509.3 | 435.8 |
| 4 | 2597.4 | 5.9 | 2516.3 | 436.4 |
| 5 | 2583.3 | -8.2 | 2489.1 | 434.0 |
| 6 | 2605.6 | 14.1 | 2532.2 | 437.7 |
| 7 | 2587.6 | -3.9 | 2497.3 | 434.7 |
| 8 | 2585.3 | -6.2 | 2492.9 | 434.3 |
| 9 | 2583.7 | -7.8 | 2489.7 | 434.1 |
| 10 | 2600.7 | 9.2 | 2522.7 | 436.9 |
| Rifle | ||||
| Projectile weight | 168.0 gr | |||
| Average velocity | 2604.9 FPS | |||
| Minimum velocity | 2586.6 FPS | |||
| Maximum velocity | 2621.4 FPS | |||
| Standard deviation | 10.8 FPS | |||
| Extreme spread | 34.8 FPS | |||
| Average power factor | 437.6 KGR-FT/S | |||
| Average kinetic energy | 2530.9 FT-LBS | |||
| Session notes | N540 43.7 338 neck 2.797 Dipped bullet | |||
| SHOT # | SPEED (FPS) | DEV/AVG (FPS) | KE (FT-LBS) | POWER FACTOR |
| 1 | 2621.4 | 16.5 | 2562.9 | 440.4 |
| 2 | 2586.6 | -18.3 | 2495.4 | 434.6 |
| 3 | 2610.6 | 5.6 | 2541.8 | 438.6 |
| 4 | 2601.4 | -3.5 | 2524.0 | 437.0 |
| 5 | 2603.3 | -1.6 | 2527.8 | 437.4 |
| 6 | 2591.5 | -13.4 | 2504.9 | 435.4 |
| 7 | 2597.8 | -7.2 | 2517.0 | 436.4 |
| 8 | 2605.0 | 0.1 | 2531.0 | 437.6 |
| 9 | 2612.2 | 7.3 | 2545.0 | 438.9 |
| 10 | 2619.4 | 14.5 | 2559.1 | 440.1 |
| Rifle | ||||
| Projectile weight | 168.0 gr | |||
| Average velocity | 2615.2 FPS | |||
| Minimum velocity | 2609.9 FPS | |||
| Maximum velocity | 2620.1 FPS | |||
| Standard deviation | 3.9 FPS | |||
| Extreme spread | 10.2 FPS | |||
| Average power factor | 439.4 KGR-FT/S | |||
| Average kinetic energy | 2550.9 FT-LBS | |||
| Session notes | N540 43.7 338 neck 2.797 Brushed neck | |||
| SHOT # | SPEED (FPS) | DEV/AVG (FPS) | KE (FT-LBS) | POWER FACTOR |
| 1 | 2609.9 | -5.3 | 2540.5 | 438.5 |
| 2 | 2618.4 | 3.2 | 2557.2 | 439.9 |
| 3 | 2616.8 | 1.6 | 2554.0 | 439.6 |
| 4 | 2610.9 | -4.3 | 2542.5 | 438.6 |
| 5 | 2620.1 | 4.9 | 2560.4 | 440.2 |
| Rifle | ||||
| Projectile weight | 168.0 gr | |||
| Average velocity | 2600.5 FPS | |||
| Minimum velocity | 2584.6 FPS | |||
| Maximum velocity | 2609.6 FPS | |||
| Standard deviation | 8.5 FPS | |||
| Extreme spread | 24.9 FPS | |||
| Average power factor | 436.9 KGR-FT/S | |||
| Average kinetic energy | 2522.3 FT-LBS | |||
| Session notes | N540 43.7 338 neck 2.797 Q-tip dry lube | |||
| SHOT # | SPEED (FPS) | DEV/AVG (FPS) | KE (FT-LBS) | POWER FACTOR |
| 1 | 2609.6 | 9.1 | 2539.9 | 438.4 |
| 2 | 2584.6 | -15.9 | 2491.6 | 434.2 |
| 3 | 2602.7 | 2.2 | 2526.5 | 437.3 |
| 4 | 2604.3 | 3.8 | 2529.7 | 437.5 |
| 5 | 2601.4 | 0.9 | 2524.0 | 437.0 |
| Rifle | ||||
| Projectile weight | 168.0 gr | |||
| Average velocity | 2617.7 FPS | |||
| Minimum velocity | 2600.4 FPS | |||
| Maximum velocity | 2642.7 FPS | |||
| Standard deviation | 14.8 FPS | |||
| Extreme spread | 42.3 FPS | |||
| Average power factor | 439.8 KGR-FT/S | |||
| Average kinetic energy | 2555.8 FT-LBS | |||
| Session notes | N540 43.7 338 neck 2.797 Dipped case | |||
| SHOT # | SPEED (FPS) | DEV/AVG (FPS) | KE (FT-LBS) | POWER FACTOR |
| 1 | 2642.7 | 25.0 | 2604.8 | 444.0 |
| 2 | 2600.4 | -17.3 | 2522.1 | 436.9 |
| 3 | 2625.7 | 7.9 | 2571.3 | 441.1 |
| 4 | 2608.9 | -8.8 | 2538.6 | 438.3 |
| 5 | 2610.9 | -6.8 | 2542.5 | 438.6 |
