Tuning Hatsan 135 .30 cal tuners?

[Toxylon]

'Bore length equals piston stroke' is folly, indeed. The piston stroke of the biggest springers available is around 120mm. So, you would get max velocity with a magnum springer using a 5" barrel?

I have always gone by the maxim that with the big-displacement spring guns you need a minimum of about 15" for maximum performance, both velocity- and cycle-wise. It has yet failed me. Mike's observations seem to match this nicely.

 

[HPP-Mechanic]

the power of a magnum works with the proper pellet to bore fit and the length of that barrel and a Hatsan magnum will be smoother if the correct size caliber is used with the power of that magnum such as 135 125
which leads us to barrel length for the mentioned magnum

Hatsan 125 135 magnums would be best suited with a barrel length long enough to keep the resistance needed for a full balanced shot cycle
A Hatsan QE 10-1/2 BARREL IS cutting things to close for being able to hone a magnum gun in for smoothness especially since the pellet to bore fit on that 10-1/2 barrels pellet to bore fit may may be iffy .
14" would of been better as a minimum but since a barrel is needed for cocking aid also a proper hand break or shroud with the barrel is needed and accuracy would be reached with a 14" barrel or a 16" barrel giving the shot cycle plenty of time to do what it needs to do
other wise the lack of pellet to bore fit due to a short barrel would result in piston slam and a horrible shot cycle
the pistons swept volume works with the barrel length and pellet to bore fit not pellet skirts flaring out to give you a proper pellet to bore fit
you would just get blow by and the magnum will not be honed in
barrel length after a certain point is useless other than a cocking aid but needs to be long enough to keep resistance in the bore long enough for the swept volume to reach maximum potential and balance

Hatsan 135 minimum bore size would be .22 but . 25 cal is best resulting in a smoother shot cycle provided all of the above has been met including a proper piston seal which Me and Rich use and install and they are made to Riches specks

I have no ideal where people get their info Me and Rich worked with these magnums FROM DAY ONE for years now
I spent lots of time and money on testing, moding, re barreling and experimenting and finding results and getting results and honing in magnums

Off topic here but Mike, have you done anything with the big Gamo gas ram magnums?

 

[4888blues]

Off topic here but Mike, have you done anything with the big Gamo gas ram magnums?

yes here a video I did on two 135- 30 cal

 

[4888blues]

Off topic here but Mike, have you done anything with the big Gamo gas ram magnums?

I see you mentioned gamo and not hatsan sorry about that ! I have two newer version gamo magnum and I will get into them later I Like the gamo magnums absolutely, I like their hammer forged barrels

 

[BABz58]

I’m sorry it was actually Rich Shar (Rich in Mich?)



https://www.pyramydair.com/blog/2019/09/2019-pyramyd-air-cup-part-2/

He’s in Ohio

 

[BryanH]

I recently started watching Mike’s videos on youtube again. I have taken a departure from air rifles in favor of archery. Not completely, just limited time for shooting and I have to make a choice. It’s tougher to stay sharp with the bow.

Anyway, I bet Mike 4888 Blues could really make the high powered Gamo rifles shine. Check him out on youtube:

Mike Ellingsworth

Sharing my passion for airguns, work done ,mods, re barreling, lathe work etc. I used to build my own electric stratocaster guitars but I have moved my interest into air rifles and lathe work etc

youtube.com

He is without a doubt *the* authority on YouTube when it comes to the magnum Hatsans.