Last edited by TonyL; 21-11-2021 at 06:36 PM.
THE BOINGER BASH AT QUIGLEY HOLLOW. MAKING GREAT MEMORIES SINCE 15th JUNE, 2013.
NEXT EVENT :- May 2025.........BOING!!
Sorry Tony, couldn’t resist
It’s another huge pat on the back for Nick, basically. It has the cocking effort of my HW30 (possibly even a bit less due to stroke length) and is as easy to shoot as my BSA Cadet.
Ultra quick cycle but also hugely soft without being bouncy. Definitely comparable to the tiny little 30.
There’s absolute minimal sight picture movement. To put that in context, we were watching the pellet flight at 30 yard targets, at 10x mag in wooded areas...
We tried the 20mm (or Mk99 as we called it) in cold conditions, in two very different stocks (including a sporter which was held in by a single bolt), shot it from various positions, with various ammo, in gusting winds and it performed flawlessly - and this is after Nick has banged it over the chrono for a few hundred rounds. I stacked four pellets on top of each other from a fairly informal sitting position at just over 30 yards.
We switched rifles several times (Nicks 20mm against my 21mm) and there was a very noticeable difference between the two. This isn’t rubbishing his 21mm setup, I’ll still be keeping that in mine as it’s rock solid stable and hits what I point it at (despite me taking it out from the house that Sarah heats to around 50degrees). It’s just that this new one is, well - nicer to shoot.
Nick, hats off to you, mate. A job brilliantly done - and thanks again for a great day out.
Best, Craig.
Put on heading 270, assume attack formation
Is this a good time to mention I've been working on a full piston 19mm ? Found a swedish supplier who can make me the spring, OD 17mm, so 0.75mm piston skirt walls. 2.8mm wire guage, will leave the guide with only 0.75mm walls too, but that's fine. Made up a small spacer to extend the cylinder the 20mm needed to gain the extra stroke, and a new forestock bracket to slide the holes back. The cocking arm needs to be custom made, as it will need a kink to clear the bracket and allow for the 115mm stroke...
am I fork ;-)
Always looking for any cheap, interesting, knackered "project" guns. Thanks, JB.
I had the same idea about a set back forend bracket. So yes, it’s a great time to bring it up, mate.
Put on heading 270, assume attack formation
Thanks for the kind words Craig I had a thoroughly enjoyable day to day ,it's nice to get another opinion especially from someone who knows air rifles so well.
Nice one , JB, already been there with the under lever, and have plates made that give extra stroke.
It's all about the spring , if you have a supplier that has 2.8 wire your halfway there.
Only half way mind .
Last edited by NickG; 21-11-2021 at 09:23 PM.
Cheers for the detailed feedback, Craigy.. Sounds utterly superb to shoot. Comments re quick yet soft cycle and minimal sight picture disturbance all noted. Nick's 21 that came to Neil's shot sublimely, so if your 21 is just like that, this sounds another step, then..
JB - taking things to a newer next there, maybe. Those margins are getting ever tighter, however. It'll be most interesting to see what you make of it.
These tunes are serious re-engineering projects and so far removed from the usual "spit and polish" and drop-a-kit-in tunes most of us are limited to. Almost akin to highly tuned, bespoke race engines. I applaud you, peeps. Well done. That envelope has been well and truly pushed.
THE BOINGER BASH AT QUIGLEY HOLLOW. MAKING GREAT MEMORIES SINCE 15th JUNE, 2013.
NEXT EVENT :- May 2025.........BOING!!
Maybe the next step is to make a gas ram, no restriction due to spring wire etc.
Plinkerer and Tinkerer
Always looking for any cheap, interesting, knackered "project" guns. Thanks, JB.
Been working on hunter carbine this week so cheekily bunged the 20 mm set up in , and it did 11.1 with 8.4 and 11.3 with 7.9, so it works with a short barrel as well happy days. .
My thoughts have also sometimes wandered along on those lines. And there are bespoke gas ram makers out there. A piston without a central rod lends itself more nicely. One of the longer stroke Gamo rifles, if someone could properly rework the trigger unit to improve it, might provide the ideal platform?
THE BOINGER BASH AT QUIGLEY HOLLOW. MAKING GREAT MEMORIES SINCE 15th JUNE, 2013.
NEXT EVENT :- May 2025.........BOING!!
Knowing that you're not one to rest on your laurels, Nick, have you got any further little tweaks in mind for this project or do you think that's it, onto endurance testing and see how it fares?
THE BOINGER BASH AT QUIGLEY HOLLOW. MAKING GREAT MEMORIES SINCE 15th JUNE, 2013.
NEXT EVENT :- May 2025.........BOING!!
Hi Tony, I think it's about there , However 🙄, building one as we speak to test in my target rifle,I am making a steel comp tube ( there is a convenient size available ), the only change in specification is a slightly shorter stroke as the other one made high 11's and I don't need that much, and a shorter stroke may be even better 🤞.Got the comp tube finished need to do the piston now so should have it in the gun by end of next week 🙂