I took my .222 to the range this evening to try some "highly" recommended IMR 8202XBR powder. As is my practice, I loaded both crimped and uncrimped loads for the first test. (25 of each) Normally, I don't worry about the actual speeds I'm getting until I get some notable results, but today I had the chronograoh set up for my .308 loads so I clipped off ten shots of each .222 load: crimped and uncrimped. These are the strips from my Chrony. For those not used to reading Chrony, the arrow points to "Standard Deviation". The number above it is the Extreme Spread. Neither is good but the difference is noteworthy. The accuracy and speeds didn't live up to the 'recommendation' so I won't continue with this powder but the chrono data is telling.
The bullet was a Hornady 52 grain HP Match. The primers were Rem 7.5 BR. All brass trimmed to same length, etc. Other than the crimp, all rounds were as close to identical as I could make them.~Muir
Sorry this came out so small.....
The bullet was a Hornady 52 grain HP Match. The primers were Rem 7.5 BR. All brass trimmed to same length, etc. Other than the crimp, all rounds were as close to identical as I could make them.~Muir
Sorry this came out so small.....