new barrel prep and caliber conversion

[62hotrod]

  Just ordered all the parts needed to convert my 177 Disco to 22 caliber for hunting. I thought 177 would cut it for hunting, but no dice. I want more, at the moment another rifle isn't in the budget. This rifle has been tuned by Normand at disco's R Us, it is crazy stupid accurate with a fantastic tune. It doesn't have an adjustable PA, it has a L&W barrel and a single barrel band. So, I think the tune will be easy to duplicate when FT season comes back around this is my back up if needed.
  My plan is to run a 10 round shot string over the chrony from a 2k fill. Remove tube plug, hammer spring and transfer port and replace with new parts except use an adjustable power adjuster, stronger hammer spring, and drill out a new TP a Little larger. Make plenty of notes on barrel band location and what not. Am I overlooking any details in being able to duplicate this tune? I'm hoping all that would be needed is to replace original parts.
 Since I'm getting a new barrel I'd like to prepare it really good before I install it.  I'd like to redo the crown I understand that. I think I'd like to polish the lead in and transfer port hole. How exactly is the lead in and T/P hole suppose to be polished, I'd hate to ruin a brand new barrel. I'd greatly appreciate any words of wisdom or suggestions. I'd really like a suggestion on what size to drill the T/P. Got any Suggestions on a really good hunting tune? Thank You in advance for your time and advice.

 

[K.O.]

http://www.gatewaytoairguns.org/GTA/index.php?topic=31208.0

[zandrew]

  Just ordered all the parts needed to convert my 177 Disco to 22 caliber for hunting. I thought 177 would cut it for hunting, but no dice. I want more, at the moment another rifle isn't in the budget. This rifle has been tuned by Normand at disco's R Us, it is crazy stupid accurate with a fantastic tune. It doesn't have an adjustable PA, it has a L&W barrel and a single barrel band. So, I think the tune will be easy to duplicate when FT season comes back around this is my back up if needed.
  My plan is to run a 10 round shot string over the chrony from a 2k fill. Remove tube plug, hammer spring and transfer port and replace with new parts except use an adjustable power adjuster, stronger hammer spring, and drill out a new TP a Little larger. Make plenty of notes on barrel band location and what not. Am I overlooking any details in being able to duplicate this tune? I'm hoping all that would be needed is to replace original parts.
 Since I'm getting a new barrel I'd like to prepare it really good before I install it.  I'd like to redo the crown I understand that. I think I'd like to polish the lead in and transfer port hole. How exactly is the lead in and T/P hole suppose to be polished, I'd hate to ruin a brand new barrel. I'd greatly appreciate any words of wisdom or suggestions. I'd really like a suggestion on what size to drill the T/P. Got any Suggestions on a really good hunting tune? Thank You in advance for your time and advice.

Just buy my .25, lol.

If you use a longer .22 barrel it will gain you velocity if your wanting to keep the current .177 tune. As light as the disco is a longer barrel should not hurt anything unless your using an ldc. Or are you wanting different tp for each caliber?

[FuzzyGrub]

IMO, with that much disassembly and reassembly it will never be perfect.  Plan on a re-tuning session once you convert back to 177. 

[62hotrod]

  Zandrew, All I can say is I hope nobody gets it before I do, but all is fair in love and war. If you have a buyer come up with the cash let it ride, my loss. I was needing some Crossman parts anyway and found out it'd be a lot cheaper than I thought to convert mine to 22. I've been wanted to try a 22 Disco and this will be a very inexpensive way, just add a little elbow grease. I've been hoping to run across a deal on a non shooting or crippled junk yard Disco to build. It was a pleasure getting to talk air guns with you the other night. We'll have to get together and do some shooting.