I have had a habit of leaning my thumb on the barrel of a gun while shooting off a rest. I especially do that when shooting off a bag, compressing the bag a bit with my thumb on the barrel, to get the crosshairs "just right". This has worked for me for years.
Then I got a 1720T and a new rest. (floated barrel & solid rest)
So I did the same things with a MTM K-Zone rest and a 1720T. My shots were very close but not like a LW barrel and a solid rest should be. Especially concerning was that they were not consistent.
Having bought the gun "used" I figured that the barrel was poor and that was why the gun was sold. So I bought a new barrel from Crosman, installed it and SOB it was doing the same thing. WTF
After many shots and many different pellets it finally dawned on me that when I used my thumb on the barrel the POE changed while the POA was the same.
Unsupported/ floated barrels DO NOT like to have a thumb adjusting the gun at all. The barrel will flex and the POE will change. This never happened with guns with barrel bands.
Only cost me $70 to learn this lesson. Hope this helps someone else.....
Nor do I... thanks for sharing :-*
Bill, if you ever want to re-purpose that extra 1720 barrel (for a 17xx or 1377) send me a PM or email. Simple job... cut off the leade-in / port, and re-port and taper.
Sounds like a good lesson learned. 8)
You didn't waste the money, you just paid to learn information. That's how I look at it. If you hadn't paid then you would've never known for sure what the issue actually was.
Sorry it happened Bill, but thinks for sharing some good info.
Quote from: WyoMan on August 20, 2016, 03:37:11 AM
Nor do I... thanks for sharing :-*
Bill, if you ever want to re-purpose that extra 1720 barrel (for a 17xx or 1377) send me a PM or email. Simple job... cut off the leade-in / port, and re-port and taper.
That's about the best thing that happened is that I have a 12" LW barrel. The lead will need a little taper but the Transfer Port lines up fine.
Now, what to put it on????
A former supervisor once told me that "Lessons cost varying amounts". He was so right!
Quote from: Redleg on August 22, 2016, 11:09:27 PM
A former supervisor once told me that "Lessons cost varying amounts". He was so right!
So true is that ... :-*
Quote from: BillK on August 22, 2016, 04:13:44 AM
That's about the best thing that happened is that I have a 12" LW barrel. The lead will need a little taper but the Transfer Port lines up fine.
Now, what to put it on????
That's great news, Bill.... You may need to drill / ream the barrel port to .140", or a bit more for a Co2 build.
Let me know if you need one of these:
(http://i1249.photobucket.com/albums/hh508/WyoMan/2550%20Gas%20Gun/TP_zpsuhd1xdyd.jpg) (http://s1249.photobucket.com/user/WyoMan/media/2550%20Gas%20Gun/TP_zpsuhd1xdyd.jpg.html)
It's .250" o.d. and will fit the barrel port C-B
Can't help you with "what to put in on", but you could always get another gun... to make the decision easier ??? :D