In follow up to my 'Part I' post, I have now tested 4 of the same 6 pellets through my 'traditionally rifled' Lothar Walther (LW) barrel and compiled the data for myself, and I figured I’d share with you the results of my measurement of the 4 pellets with you to help the airgun community. The following pellets were tested in .25 caliber, as shot through my RAW HM1000x, LW barrel (traditionally rifled): the JSB lites (25.39 grain), the JSB Heavy, Mk I (33.95 grn), the JSB Heavy, Mk II (33.95 grn), the H&N Baracudas (31.02 grn). In part I, I also tested the H&N Baracudas Hunter Extremes (28.40 grn), and the Predator Polymags (26 grn) pellets, but did not have sufficient daylight to complete testing those pellet the other day. If you desire me to test those pellets, please let me know and I'll put it on my 'to-do' list for when temps and conditions were similar to the 4 pellets tested here.
All pellets were not measured and were taken straight out of the tin without sorting for weight. No sorting for head sizes was complete either-so accuracy and variability are what you will typically experience shooting straight out of the tin.
Muzzle velocity, near was taken with the rear window of the chrony at 1 yard from the tip of the moderator
Distance to far measurement, was taken with the rear window of the chrony at 50 yard from the tip of the moderator
Delta (distance) between locations: 49 yards (measured with a Nikon laser rangefinder with angle compensation)
Setup @ 1 yard:
Setup at the target (@ 50 yards, a 49 yard delta):
I opened up Chairgun (Mac version) and adjusted the environmental conditions, altitude, etc. I then went to the BC calculator app, plugged in the data, and calculated the following results (below). The average temp today was 63F, with calm, but low winds (9 mph out of the NNE), 48% Humidity, pressure at 29.98 in Hg.
My gun: RAW HM1000x, setup in .25 caliber, with a LW traditionally-rifled barrel. Notes: the same chrony was used at both distances (as in the same exact serial number). Velocity data is shown below. I shot a full magazine's worth of pellets (though single-shot loaded) with the chrony set at both the near and far locations, with each pellet (so 12 shots for each x 8 setups = a LOT of shots). The one exception was the last shot on the H&N Baracuda's at 50 yards-I ran out of daylight and absolutely could not squeeze out one more single reading to complete the data-yep, it pissed me off, grrrr... LOL.
Note: the temperature was different today compared to when I shot 'part I' through the polygon barrel, so the first step in performing part II was to shoot a single, common pellet through the same setup to determine the effect of the temp on the BC's. I did this with the .30 cal setup (was already setup) shooting the JSB lite pellet. From 48F to 66F, the temp effect resulted in a rise of approx 7.6% in the BC. Thus below, I've added both the RAW data (at the tested temp) and the temp corrected BC's for better 'direct comparison' between the barrels-because I know that's ultimately the comparison that will happen. Just be aware, there are changes from barrel to barrel, as well as with changes in environmental conditions (temp, humidity, etc). BC also changes between distances that are tested-hence the need to settle in on a single, repeatable test method (which I'm in the process of writing up for anyone to perform similar testing with their own combinations).
A few comments: don't read too much into the standard deviations of the less accurate pellets (JSB Lites, H&N BHE, and PP) at 50 yards. I had several 'err1' or 'err2' messages as the pellets drifted slightly left or right, not centering over the optical windows. I feel this affected the reading slightly on certain pellets-thus I had to reshoot several of the pellets to get a full 12 shots of data. To be as accurate with the numbers as possible, I threw out the high and low (for calculating the averages) for both the 1 yard and 50 yard data. The standard deviation and spreads shown in the chart below represent all 12 data points for each pellet, at each distance-not the middle 10.
I hope this is helpful information for anyone looking for data from this gun / setup? If so, and you appreciate the time / effort, please take a minute and leave me a ‘+’ (it’s just a small way that makes me feel like I’m helping contribute useful content to the forums), and consider posting a reply as well. It's a small thing, but it's a big thing to me to know my efforts are appreciated, and keeps me motivated to spend time doing this stuff for the community.
First up: JSB lites (25.39 grn):
12 shot group:
Next up: JSB Heavy, Mk I (33.95 grn):
12 shot group:
Next up: JSB Heavy, Mk II (33.95 grn):
12 shot group: (note the shots at the bottom are from the JSB Lites)
Next up: H&N Baracuda (31.02 grn):
12 shot group:
Next up: H&N Baracuda Hunter Extremes (28.40 grn):
(Not tested through LW rifled barrel.)
12 shot group:
(Not tested through LW rifled barrel.)
Last up: Predator Polymags (26 grn):
(Not tested through LW rifled barrel.)
12 shot group:
(Not tested through LW rifled barrel.)
And the RAW data, summarized in chart form (pun intended, LOL):
Overall comparison of the groups:
Top Group: JSB Heavy, Mk I (Note flyer low right, and high left -those were the first two shots)
Second Group: JSB Heavy, Mk II (Note: some of the JSB Lites from the group below crowd this group)
Third Group: JSB Lites
Bottom Group: H&N Baracuda (they shot pretty well in this barrel-I was impressed!)
Overall comparison of the barrel effects on the BC’s:
Sean
PS: as a side note, several people have asked about the app to measure group sizes: the (iPhone) app is called 'SubMOA'. It's a manual process, and a little clunky at first, but it ends up being decent to use once you get the hang of it...
All pellets were not measured and were taken straight out of the tin without sorting for weight. No sorting for head sizes was complete either-so accuracy and variability are what you will typically experience shooting straight out of the tin.
Muzzle velocity, near was taken with the rear window of the chrony at 1 yard from the tip of the moderator
Distance to far measurement, was taken with the rear window of the chrony at 50 yard from the tip of the moderator
Delta (distance) between locations: 49 yards (measured with a Nikon laser rangefinder with angle compensation)
Setup @ 1 yard:
Setup at the target (@ 50 yards, a 49 yard delta):
I opened up Chairgun (Mac version) and adjusted the environmental conditions, altitude, etc. I then went to the BC calculator app, plugged in the data, and calculated the following results (below). The average temp today was 63F, with calm, but low winds (9 mph out of the NNE), 48% Humidity, pressure at 29.98 in Hg.
My gun: RAW HM1000x, setup in .25 caliber, with a LW traditionally-rifled barrel. Notes: the same chrony was used at both distances (as in the same exact serial number). Velocity data is shown below. I shot a full magazine's worth of pellets (though single-shot loaded) with the chrony set at both the near and far locations, with each pellet (so 12 shots for each x 8 setups = a LOT of shots). The one exception was the last shot on the H&N Baracuda's at 50 yards-I ran out of daylight and absolutely could not squeeze out one more single reading to complete the data-yep, it pissed me off, grrrr... LOL.
Note: the temperature was different today compared to when I shot 'part I' through the polygon barrel, so the first step in performing part II was to shoot a single, common pellet through the same setup to determine the effect of the temp on the BC's. I did this with the .30 cal setup (was already setup) shooting the JSB lite pellet. From 48F to 66F, the temp effect resulted in a rise of approx 7.6% in the BC. Thus below, I've added both the RAW data (at the tested temp) and the temp corrected BC's for better 'direct comparison' between the barrels-because I know that's ultimately the comparison that will happen. Just be aware, there are changes from barrel to barrel, as well as with changes in environmental conditions (temp, humidity, etc). BC also changes between distances that are tested-hence the need to settle in on a single, repeatable test method (which I'm in the process of writing up for anyone to perform similar testing with their own combinations).
A few comments: don't read too much into the standard deviations of the less accurate pellets (JSB Lites, H&N BHE, and PP) at 50 yards. I had several 'err1' or 'err2' messages as the pellets drifted slightly left or right, not centering over the optical windows. I feel this affected the reading slightly on certain pellets-thus I had to reshoot several of the pellets to get a full 12 shots of data. To be as accurate with the numbers as possible, I threw out the high and low (for calculating the averages) for both the 1 yard and 50 yard data. The standard deviation and spreads shown in the chart below represent all 12 data points for each pellet, at each distance-not the middle 10.
I hope this is helpful information for anyone looking for data from this gun / setup? If so, and you appreciate the time / effort, please take a minute and leave me a ‘+’ (it’s just a small way that makes me feel like I’m helping contribute useful content to the forums), and consider posting a reply as well. It's a small thing, but it's a big thing to me to know my efforts are appreciated, and keeps me motivated to spend time doing this stuff for the community.
First up: JSB lites (25.39 grn):
12 shot group:
Next up: JSB Heavy, Mk I (33.95 grn):
12 shot group:
Next up: JSB Heavy, Mk II (33.95 grn):
12 shot group: (note the shots at the bottom are from the JSB Lites)
Next up: H&N Baracuda (31.02 grn):
12 shot group:
Next up: H&N Baracuda Hunter Extremes (28.40 grn):
(Not tested through LW rifled barrel.)
12 shot group:
(Not tested through LW rifled barrel.)
Last up: Predator Polymags (26 grn):
(Not tested through LW rifled barrel.)
12 shot group:
(Not tested through LW rifled barrel.)
And the RAW data, summarized in chart form (pun intended, LOL):
Overall comparison of the groups:
Top Group: JSB Heavy, Mk I (Note flyer low right, and high left -those were the first two shots)
Second Group: JSB Heavy, Mk II (Note: some of the JSB Lites from the group below crowd this group)
Third Group: JSB Lites
Bottom Group: H&N Baracuda (they shot pretty well in this barrel-I was impressed!)
Overall comparison of the barrel effects on the BC’s:
Sean
PS: as a side note, several people have asked about the app to measure group sizes: the (iPhone) app is called 'SubMOA'. It's a manual process, and a little clunky at first, but it ends up being decent to use once you get the hang of it...
