This is the 2nd one I bought to give to my nephew for Christmas. It was shooting 63 fps slower than the 1st one I got, using JSB 7.33's.
So I took it apart for an inspection.
It already has wear marks on the receiver tube from the cocking linkage.
So I deburred the linkage and tube with a needle file and polished them with a cratex bit in my dremel.
I reblued the receiver (not shown here). Deburred all the receiver cut outs and holes. The factory spring guides are sloppy loose and the spring was kinky, so I ordered 2 new JM HW30/R7 springs, they are shorter by about .600" and use a thicker wire, .113" - 27 coil vs the .106" - 29 coil factory spring. Then I made new guides for a snug fit.
After consulting with Ed Canoles about his break barrel oring piston sealing process, I decided to follow his play book and try to oring seal this HW30. After making a gage with a couple of interchangeable heads, with different diameters.
I then checked the receiver tube to find a tight restriction where the hanger is welded on. With this, I made a hone, similar to Ed's out of PVC pipe. After honing 95% of the restriction out, I made a test piston head to attach to my gage handle and checked to see if it would seal, and it did. pushing or pulling it held tight. The factory seal didn't hold as well when tested.
With this, I went ahead and made the real oring piston seal, polished the piston and checked for latch rod run out. Factory guide beside my guides.
Lubed everything with Krytox 223, don't have time to go thru the trigger, cleaned it and adjusted. Here's the JM spring on the left vs the HW on the right.
Tonight I tested five different pellets at 10' over the Garmin Xero in my garage, I'll retest at a longer distance tomorrow. Anyway, I gained 51 fps with the falcon 7.33 and 36 fps with the JSB 7.33 which are a looser fit. Not much gain with the 8.44 pellets 11 fps, but a gain none the less.
The H&N baracuda 8 was the tightest fitting of the five I tested. I don't have time for anymore testing, but I will when I go thru my own HW30 later on.
Will have to see how it settles in after they shoot it a bit. Right now only about a hundred pellets thru it. I'm calling my effort a success with the 7.33's.
So I took it apart for an inspection.
It already has wear marks on the receiver tube from the cocking linkage.
So I deburred the linkage and tube with a needle file and polished them with a cratex bit in my dremel.
I reblued the receiver (not shown here). Deburred all the receiver cut outs and holes. The factory spring guides are sloppy loose and the spring was kinky, so I ordered 2 new JM HW30/R7 springs, they are shorter by about .600" and use a thicker wire, .113" - 27 coil vs the .106" - 29 coil factory spring. Then I made new guides for a snug fit.
After consulting with Ed Canoles about his break barrel oring piston sealing process, I decided to follow his play book and try to oring seal this HW30. After making a gage with a couple of interchangeable heads, with different diameters.
I then checked the receiver tube to find a tight restriction where the hanger is welded on. With this, I made a hone, similar to Ed's out of PVC pipe. After honing 95% of the restriction out, I made a test piston head to attach to my gage handle and checked to see if it would seal, and it did. pushing or pulling it held tight. The factory seal didn't hold as well when tested.
With this, I went ahead and made the real oring piston seal, polished the piston and checked for latch rod run out. Factory guide beside my guides.
Lubed everything with Krytox 223, don't have time to go thru the trigger, cleaned it and adjusted. Here's the JM spring on the left vs the HW on the right.
Tonight I tested five different pellets at 10' over the Garmin Xero in my garage, I'll retest at a longer distance tomorrow. Anyway, I gained 51 fps with the falcon 7.33 and 36 fps with the JSB 7.33 which are a looser fit. Not much gain with the 8.44 pellets 11 fps, but a gain none the less.
The H&N baracuda 8 was the tightest fitting of the five I tested. I don't have time for anymore testing, but I will when I go thru my own HW30 later on.
Will have to see how it settles in after they shoot it a bit. Right now only about a hundred pellets thru it. I'm calling my effort a success with the 7.33's.
