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Post by Sandman on Oct 23, 2020 12:10:39 GMT
Last week when I was visiting family on Merseyside I took the opportunity to invest in a couple of guns, 1 AA S400f - lovely gun,
2, A Logun mk1 professional. I took them out to a local range, the 400 behaved immaculately, banging out 11.3 ft/lbs every time.
The Logun was a different story, loud bangs and 30-42 ft/lbs, lot of dieseling and fragmenting pellets.
I took the gun home and stripped it down, full of oil and grease. This was all cleaned off and a more sensible oiling carried out.
tested again, no dieselling but still 14-15 lbs/ft. I examined the gun and noticed the stock at the back end had traces of paint. I dismantled the stock and could see the end cap on the gun had been tampered with. I removed the end cap and found 2 additional washers on the hammer spring, removed same and retested, 11.6lbs/ft with accupel 7.9gn. Legal but makes me nervous. I will keep an eye on it once I bring it to Aberdeen when I get my license.
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Post by Safety Officer on Oct 23, 2020 15:46:16 GMT
 Well done that Sandman, for checking his new weapon before using on the GARC ranges, sounds like you have solved the problem and passed from the  with flying colours. I think that you may have also claimed a nickname for yourself as well. |
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Post by Who? on Oct 23, 2020 16:39:22 GMT
The Sandman reference was too obscure for me - Google helped me out! George, you got a 200 as well as a 400?  |
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Post by Sandman on Oct 23, 2020 16:58:41 GMT
No just the 400, it was too good to miss. I did however miss a better bargain, £425 for a brand new still in the box s400 plus scope.
Good thing about family visits, lots of choice within 2 hour ride.
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Post by Bri M on Oct 23, 2020 20:30:50 GMT
That's got me thinking of Jenny Agutter and Heather Menzies.
Keeping things on a vaguely gun related theme, I think the Sandman Blaster is my favourite sci-fi gun - less dated looking than either the sidearms in Forbidden Planet, Star Trek phasers or the Colonial Marines M41A Pulse Rifle.
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Post by Sir Bob the Hare on Oct 26, 2020 0:32:00 GMT
 Sandman Blaster  M41A Pulse Rifle Both available from Ray's Guns of Ellon |
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Post by Bri M on Oct 26, 2020 7:49:21 GMT
  Separated at birth?  Should be good for 10m targets. |
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Post by chris387 on Oct 26, 2020 22:28:50 GMT
Now then, over powered rifles. it would seem that Georges post has started something off. A couple of weeks ago a HW77 early .22 (25mm piston head) came to stay with me, after I acquired it from a club member who had himself acquired it a week before that from one of his friends. It was a bit tatty and needed some work on the metal and stock ect, and had a recoil that any goose gun would be proud of. On testing it before I started repairs / servicing this wee beastie I put it through the chrono.....17lbs, after a string of 5 shots average of 16.7lbs and a good hole through my first back stop and with added big & deeper dents in my second metal plate stop as well.....On pulling it apart I found a square /box spring in place. I replaced the seals and spring with HW parts and now shooting a steady 10.9 - 11.lbs. Just right for a sub 12lb springer...now to get it zeroed!....bless it This Sunday at Waulkmill, a newish club member bought along a new to him (second hand) BSA R10 fitted with a DIY Huma Regulator fitted by it old owner, Alex C had his chrono with him so just to check the power levels for the new owner, Alex did a string of shots for him............14.5 lbs average!!! A bit of adjustment need then, I think A few years ago (7) I bought a new from the factory .25 sub 12lbs PCP rifle. I tested it a year later to find out that it was pushing out nearly 16 lbs. A quick adjustment of the hammer spring and set it to 11.4, tested it each year since and glad to say still around the 11.4 Yep, owning your own chrono is one of the best buys you can make if you are into sub 12lb air gunning and worth getting a good one, I have in the past shot to bits, three stick on the end of your barrels cheep chrono, bought a new one some years ago that cost the same amount as the 3 combined and its still dent free and working perfect and in regular use due to the amount of old guns I work on or doing jobs for other folks.  x3  perfect So if your buying second hand or new? always best to check the power output with a chrono as soon as possible and check regularly after that. If you don't own a chrono their are many members of our club who do have one and I am sure would be happy to assist you in keeping legal. |
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Post by Bri M on Oct 27, 2020 7:27:06 GMT
Good advice.
A chrono is invaluable for peace of mind - knowing that you're not looking at a huge fine or prison time is justification for the outlay on its own, never mind the diagnosis or tuning benefits.
After fitting a full length 0.177 barrel to my previously 0.25 HW80K, I ran a few shots through my LMBR R2A chrono. I'm going to take the Fifth Amendment on what it was kicking out to avoid incriminating myself in print but let's just say that it was a very hot day.
Some spring shortening followed very quickly and I'm now looking into short stroking the thing to get it shooting sweet and legal.
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Post by GeorgeW on Oct 27, 2020 7:59:35 GMT
So that’s stirred up a conversation.
perhaps we should test our guns regularly, say a couple of times a year.
on the subject of testing, how do we test the tester ?
When I was fixing the said gun l couldn’t believe the chrono, I couldn’t believe the gun was
putting out that power.
After I fixed it I tested it on a number of chrono with variable results.
I finally tested it on a Skan and was satisfied with the result.
One of the principles of any test is that you test the tester, the Skan has an internal self test giving me confidence in the result.
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Post by Who? on Oct 27, 2020 11:36:58 GMT
So that’s stirred up a conversation. perhaps we should test our guns regularly, say a couple of times a year. on the subject of testing, how do we test the tester ? When I was fixing the said gun l couldn’t believe the chrono, I couldn’t believe the gun was putting out that power. After I fixed it I tested it on a number of chrono with variable results. I finally tested it on a Skan and was satisfied with the result. One of the principles of any test is that you test the tester, the Skan has an internal self test giving me confidence in the result. A good point. What were the chrono’s that gave the variation? and how much was the variation? I have two chrono, Combro and Caldwell Ballistic, I occasionally use both to check if there is a variation between them. The most variation I’ve seen is 1fps (possibly a ‘rounding’ issue, as the Caldwell display only has whole numbers). I originally got two so I could get the muzzle and downrange velocity of the same shot to calculate the average BC to put into Chairgun Pro. I quickly realised I could check each chrono against the other - what chance they are both giving the same inconsistent errors every time or both gone ‘out of calibration’ by the same amount? Granted they may both be out of calibration when I received them new, but the Combro does come with a certificate and details of the correction factor to achieve that calibration. What is there to go out of calibration? The light sensors are fixed in position, so unless you bang the chrono they should not move. It has an electronic ‘clock’, unless the battery/power supply voltage drops too low the count rate shouldn’t change. The are no moving parts to wear. The only problems I’ve had are: 1. Lighting for the sensors on the Caldwell (and the prochrono I had). Since buying a set of proper lighting shields I’ve not had any problems. 2. Inconsistent distance from the muzzle or inconsistent placement of the pellets over the sensors both of theses issues are overcome by the design of the Skan, the Combro and any other chrono with a small aperture and own light source. Perhaps that is root cause of the ‘V’ type chrono errors? |
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Post by Bri M on Oct 27, 2020 11:54:37 GMT
As you say, there's no moving/mechanical parts to wear but electronics do sometimes "drift" as components get older.
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Post by Who? on Oct 27, 2020 11:58:19 GMT
As you say, there's no moving/mechanical parts to wear but electronics do sometimes "drift" as components get older. I bow to your superior knowledge on electronics. I’m hoping my thought “what chance they are both giving the same inconsistent errors every time or both gone ‘out of calibration’ by the same amount?” isn’t similar wrong. |
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Post by Sandman on Oct 27, 2020 12:51:25 GMT
The dilemma I had was that I was out of town shooting a gun new to me with chrono,s I wasn’t familiar with.
I was sure the gun was shooting wildly but I also wasn’t confident how accurate the chrono was, especially in light of some of the readings I was getting.
Hence my comment about self test facility.
If you have 2 chronos then yes you can compare them.
A lot of people are buying cheap and cheerful chronos they should be tested against a known source otherwise we are in
danger of using an over power gun.
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Post by chris387 on Oct 27, 2020 13:52:19 GMT
I agree with George "The Sandman". I love my Skan and have tested it against other chrono's that look more like mini radar stations in a box, so far have never had a problem with reading taken from other good makes of chrono's out there, when comparing performance to my own and trusted Skan. So yes good to compare with other chrono's for the power output of your weapon.
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