Thanks for this writeup. I, too, have a bit of "extra leverage". I am interested in this air rifle along with the Benjamin 397/392. I hear the Benjamin's are hard pumpers also. For me, a plus with the Benjamin models is the lack of any blueing. Brass barrel, painted metal and wood means less chance of rust. Here in the Puna District of the big island of Hawaii rust is a constant problem. Due to my ancient eyesight I have to use a scope. This gun wins that subject, as the Benjamin's are more difficult to scope. Looking forward to your accuracy results.
Predator Polymag 8.2gn @ 5 pumps = 754.3 & @ 8 pumps 832.2Double Holy Smoke !!
Quote from: Rob112o on April 13, 2018, 12:41:20 PMThanks for the OD on barrel. Just looked at the schematics for the rifle. Is the barrel band that the rear site sits on, made of plastic as well? In the pic on PA looks like it could be plastic.That band/riser was metal. And it looked to be dovetailed to be a 11mm rail on top. I was thinking maybe a small red dot out there would be cool on it too. I did not see a set screw for the plastic rear sight body yet but it could easily be under the sight's elevation lever arm. It is clearly dovetailed and slid on though. I will look into removing the adjustment screw to look for it and measuring the rail to be sure when I get to break it out again. almost all my weekends are committed to other things so hopefully Monday on that for ya.
Thanks for the OD on barrel. Just looked at the schematics for the rifle. Is the barrel band that the rear site sits on, made of plastic as well? In the pic on PA looks like it could be plastic.
Put another 45 through it to check pre-break in groups with no glass tonight. That laser was my plan:First off, what I called oil was absolutely 100% water. Now, I only shot the gun prior to this afternoons chrono tests indoors at a AC climate controlled range. So when I set the Qtips down on White paper to see if there was any metal traces as it spread out (my my version of El Cheepo chromatography) it was shocking to come home and find oil-less paper....100% dried off water and rust. What I called oil in the last post was not that at all. It had to have been shipped wet, moisture and rust was flying....Yikes, This came WET. Those chroni rounds went through after only 35 shots. There is NO WAY i pumped that much water into this thing before those 38 rounds of chrono testing today last night. The spray I just assumed was oil was 100% water and rust. It is dry on the target and paper where the Qtips were set. Just Brown rust. Sorry to repeat myself but I was shocked...Moving on...The shot count after tonight stands at 115. Ther was a few error reads during the chroni tests. So there was the first, then the chrono test, then adding 40 tonight.So, that was the bad...the water... The good is...I did not mount the laser for lack of the correct allen wrenches. So the additional 40 pellets tonight went through it with open sights, except tonight I had reading glasses. I got the same 2" 10 shot groups as the other night. But with the glasses only 2-3 of the outside shots were not a one hole mess in the middle. i didn't expect that with just Walmart reading glasses! It's been a very long time since I even tried. So this was a thrill.It was also amazing to shoot with one pump and that tiny little mag. The mag worked flawlessly and the groups reflected the mindless cock, pump, fire cycle that keeps ya focused. This is gonna work. It has my attention now!So the break in continues. And my optimism grows, all tonight's groups were 1 pump shots. And I see a future with this as my SSP 10m gun in the future.I am thinking that fabricating an elongated wood pump handle that could be shaped something like an Avanti that reaches farther back toward the trigger is a possibility. That would be cool...and it seems like it could be very effective at making it a two pumper for paper in the 530 fps range. That is a really cool prospect..
I am thinking that fabricating an elongated wood pump handle that could be shaped something like an Avanti that reaches farther back toward the trigger is a possibility. That would be cool...and it seems like it could be very effective at making it a two pumper for paper in the 530 fps range. That is a really cool prospect..
Quote from: P. O. I. on April 14, 2018, 12:50:41 AMI am thinking that fabricating an elongated wood pump handle that could be shaped something like an Avanti that reaches farther back toward the trigger is a possibility. That would be cool...and it seems like it could be very effective at making it a two pumper for paper in the 530 fps range. That is a really cool prospect..I was thinking the same thing. I moved the pump handle back on my 392 and it made a huge difference. How is the pump arm attached? Maybe make a U-shaped fiberglass overlay that extends the pump handle back as far as possible?Here's how I modified my 392.
Quote from: bhh on April 14, 2018, 02:54:17 PMQuote from: P. O. I. on April 14, 2018, 12:50:41 AMI am thinking that fabricating an elongated wood pump handle that could be shaped something like an Avanti that reaches farther back toward the trigger is a possibility. That would be cool...and it seems like it could be very effective at making it a two pumper for paper in the 530 fps range. That is a really cool prospect..I was thinking the same thing. I moved the pump handle back on my 392 and it made a huge difference. How is the pump arm attached? Maybe make a U-shaped fiberglass overlay that extends the pump handle back as far as possible?Here's how I modified my 392.
That is so cool Bhh!!! Perfect for this gun... really nice. An added benefit is that I could keep the forend from rubbing the pump housing. There is a little rub already. it's a tight fit. The forend is just held on by a few screws all the way through...I think. I'll let you know if otherwise.Great job on that 392... why wont they do it to start with? Did you lengthen the metal armature to do that? I don't see the pin holes back where the original mount would be.
Now, that your mentioning the water in the valve...that could explain your high fps numbers and hard to pump? Maybe that's the norm, but with that water taking up valve your essentially over pumping. The reason it's still dumping all the air, like you said "needs to be pumped to accept a pump" would explain it still doing a full dump. Have you tried shooting it to a full 8 several times, say 3 times, then on the 4th time to 8 pumps, shot it then cock it and shoot again. See if you have air left in the valve.