Chronograph Evidence - Bullet Consistency
Below is the data from a 300 H&H Magnum. We put a new barrel on the action, and I broke it in using Hoppes for removing the carbon and Sweets solvent for removing the copper. We cleaned it again very thoroughly after the break-in. I then shot and chronographed a 5 shot group (SERIES 1). The group size was just over 1’. The average velocity was 3,226 Feet per Second. The extreme velocity spread was 49 Feet per Second and the Standard Deviation was 18. The load was using 71 Grains of H4350 hand weighed, carefully prepared cases and 150 Grain Sierra Pro Hunter Bullets. All cases were neck sized only cases that had been previously fired during initial barrel break in procedures.
SERIES 1 Data
(group shot after break-in using old cleaners and lubes)
|Group Size||1.049 inches center to center|
|Series||1||Number of Shots||5|
|Min Velocity||3196||Max Velocity||3245|
|Avg. Velocity||3226||Standard Deviation||18|
(group shot after treating with Modern Spartan Systems)
|Group Size||0.614 inches center to center|
|Series||2||Number of Shots||5|
|Min Velocity||3278||Max Velocity||3291|
|Avg. Velocity||3282||Standard Deviation||5|
As you can see, after treating with Modern Spartan Systems Accuracy Oil™ and cleaning with the MSS Carbon Destroyer and Copper/Lead Destroyer the average velocity was increased by 56 Feet per Second and the extreme velocity spread was cut by over 70%, as was the Standard Deviation! This enhanced consistency I am told by the developers is due to a smoother, harder bore after treatment. This ultimately translates into the size of the shot group being much smaller. I HAVE SEEN THESE SAME RESULTS WITH SEVERAL OF MY RIFLES, BOTH OLD AND NEW and know that the effects of these products on enhancing the accuracy of firearms is very real!