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Batch Testing at Eley - 21st June 2010
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16-03-2010 12:24pm#1
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Mr Mills at the test rig......pretty boy, aint he!!
This is one of two rigs, both 50m tunnels encased in concrete. Barreled actions are torqued into slave emini stocks, which are then clamped into a vice before testing.You have an electronic target system in another room at the other end generating the results which are shown on the screen above your head.
Simple!0 -
intershoot wrote: »Mr Mills at the test rig......pretty boy, aint he!!
He hasnt been the same since leaving the Boy Band!!:D0 -
This is my previous test report.
If you look at pages 5,6 & 7 you will see I started with a control batch of Match (what I was using at the time!), and I also tested 20 different batches of Tenex.
The first stage involves shooting 10 rounds of each batch, giving you 20 10-shot groups plus the control. From this 8 batches were dropped as the ten shot groups were greater than 15.9mm.
The second stage was to fire a further 30 rounds of the remaining batches, giving three more groups of ten.
The third stage takes the 4 10-shot groups and overlays them in a true 40-shot groups (pages 2,3,& 4). This is then accompanied with a consolidated score, and a group size for the 40 shots. The graph also illustrates the degree of consistancy, or how many shots were 10.5 or over for example.
The batch I selected was 4019, and although batch 3523 had a higher score you will see from the graph it had 1 shot at 10.1, whereas the other batch had nothing below a 10.3.
I hope this is of some benefit/interest, but if you would like any more info just shout :eek:
Regards,
sam@intershoot.co.uk
:cool:
just one more point worth noting....my control ammo, the Match, was producing a better group than some of the Tenex. This just gos to show that unless Tenex is matched to your barrel it's not worth buying. You can happen upon Match or something that just happens to match the harmonics of your barrel, but the problem is a consistent supply! Batch test and by 5k rounds
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intershoot wrote: »Mr Mills at the test rig......pretty boy, aint he!!He hasnt been the same since leaving the Boy Band!!:D
Everyone's a comedian :P
Might send my own barrel over, if only to get in the photos again 0 -
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Best case scenario, you're talking about going from a really bad group size to a really good group size. Say you go to an indoor range (so no wind) and shoot some test groups and you're getting 25mm edge-to-edge off a good bench rest with your current ammo, and you can batch test down to (why not) 12mm edge-to-edge. Better than half the group size. Okay, so how good is that?
The actual point of impact of each round is going to be random, depending on variations in the rounds' manufacturing; and the actual statistical analysis isn't straightforward (though it doesn't go above leaving cert maths). Say, for argument's sake, that it's perfectly random (ie. it's just as likely to hit anywhere in the group). Once you work through the math, out of 60 shots, you're looking at a score of about 579 for a 25mm group size and perfect aim every time.
But that score isn't terribly likely because we're assuming very wierd ammunition there, which can land anywhere inside the group with equal probability, but will never land outside the group ever. In real life, that never happens, and the probability will follow the normal distribution instead:
So with our 25mm group ammo, we'd probably expect to see a higher score than 579 because more rounds will land closer to the centre than will land further away from it. Depending on how you run the math and your assumptions, you'll get different results, but with a normal distribution I'm coming up with everything out to 1.6 standard deviations hitting the ten ring, which translates to around 89% of shots being a 10 - in other words, a score of 593.
So, with the best case scenario, if you start with a crappy group size and perfect technique and no wind/light variations, you can go from 593 to 600 just by batch testing. Seven points. Assuming perfect conditions.
Basicly, I wouldn't do it until I was hitting somewhere around the 585-590 level. I'd spend the time training instead. Mind you, if you're at that level and looking at going abroad (and there are a few folks on here who are at that level), then yes, you have to do it (all your competiton will be).0 -
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