jsam
02-01-2014, 04:05 PM
2-1-2014
I did another test today to see the effect of using gas checks vs no gas checks. Once again I used a Ruger #1 in 30-30.
Range conditions 23 degrees overcast 5-10 mph wind from the NW.
As is most always the case, after the testing I have more questions and dont pretend to have any answers as to why things are as they are.
Lee FP weighing 178 grains (weight before lube and gas check ) with gas check sized .3095 carnuba red lube.
9.2 grains Herco
CCI 200 primer
4 5 shot groups at 100 yards averaged 1.4 inches ( best group 1 inch )
average velocity 1225
es 52
sd 12
Lee FP unsized LLA no gas check
9.2 grains Herco
CCi 200 primer
4 5 shot groups at 100 yards averaged 2.5 inches. ( best group 2.1 inches )
average velocity 1268
es 51
sd 12
I had never chronographed gas checks vs no gas checks before this week. While the sample size is so small no conclusions can be arrived at,
but, so far the sized bullets with gas checks and conventional lube are slower than the unsized bullets with no gas checks and LLA. The question
that I have is is it the difference in lube, difference in sizing, or perhaps just an anomloly?
The Lee FP 178 grain bullets averaged 43 fps slower sized with gas checks lubed with carnuba red vs unsized lubed with LLA.
With 150 grain saeco 316 the difference in average velocity recorded for 20 shots was 81 fps less for sized with gas checks carnuba red lube vs
unsized lubed with LLA.
The standard deviation and extreme spread for the Lee FP are almost exactly the same only the average velocity is different. The previous test with Saeco 316 the sd and es were close but not as close as the Lee bullet test done today.
I did another test today to see the effect of using gas checks vs no gas checks. Once again I used a Ruger #1 in 30-30.
Range conditions 23 degrees overcast 5-10 mph wind from the NW.
As is most always the case, after the testing I have more questions and dont pretend to have any answers as to why things are as they are.
Lee FP weighing 178 grains (weight before lube and gas check ) with gas check sized .3095 carnuba red lube.
9.2 grains Herco
CCI 200 primer
4 5 shot groups at 100 yards averaged 1.4 inches ( best group 1 inch )
average velocity 1225
es 52
sd 12
Lee FP unsized LLA no gas check
9.2 grains Herco
CCi 200 primer
4 5 shot groups at 100 yards averaged 2.5 inches. ( best group 2.1 inches )
average velocity 1268
es 51
sd 12
I had never chronographed gas checks vs no gas checks before this week. While the sample size is so small no conclusions can be arrived at,
but, so far the sized bullets with gas checks and conventional lube are slower than the unsized bullets with no gas checks and LLA. The question
that I have is is it the difference in lube, difference in sizing, or perhaps just an anomloly?
The Lee FP 178 grain bullets averaged 43 fps slower sized with gas checks lubed with carnuba red vs unsized lubed with LLA.
With 150 grain saeco 316 the difference in average velocity recorded for 20 shots was 81 fps less for sized with gas checks carnuba red lube vs
unsized lubed with LLA.
The standard deviation and extreme spread for the Lee FP are almost exactly the same only the average velocity is different. The previous test with Saeco 316 the sd and es were close but not as close as the Lee bullet test done today.