Since I have been on here, I have read dozens of posts with reports of 12, 20, 40 and someone even posted "60" pumps on the 13XX platforms :D
For me, the question(s) beg to be answered,
How long does it take to pump 20 or, 40 times?
What do you get (fps or m.e.) in return?
Is this just for target shooting or... does that squirrel or other prey actually take a nap while you pump?
How well do the linkage parts and tube (sheet steel) hold up to this effort/ strain?
I know a little bit about pumpers and valve systems and anything past 12 or 15 seems extreme! ???
I have read this also ......
Guess I am lazy .....
co2 for me all the way ....
my 1300 I only pump 3 times which is fine and dead on at 5m ....
:-*
Ya, 5 or 6 pumps for 10 meter shootin with the 1377, same for the 2289.
I'm just wondering out loud how you hunt with 20+ pumps?
A couple of my 13XXs I have pumped up to 20 times! I usualy pump 15 ! With the Flat Top pump and valve
15 does great. I get around 850 FPS out of them , but they have 24" barrels. They are great for target and squirrels. After a kill on a squirrel I pump it back up and them start lookin for another one. I shoot Crosman HPs in them. I hope this will help you!
Mike
Ok, it was more obvious than I thought... Pump (12-20), stalk prey, one-shot (another type of "pray"), if missed, pump again and wait for prey to return.
Still, seems all the clickin & clackin of pumping would drive away the smaller prey in a 100 yard circle?
Usually 5 pumps for target and plinking...when I don't lose count :D
13 is the most I've ever done because they develop over 40 lbs closing force and that took about 30 seconds
don't think its possible to pump mine past 15
Quote from: BDS on November 11, 2013, 10:48:43 PM
Ok, it was more obvious than I thought... Pump (12-20), stalk prey, one-shot (another type of "pray"), if missed, pump again and wait for prey to return.
Still, seems all the clickin & clackin of pumping would drive away the smaller prey in a 100 yard circle?
;D ;DJust don't miss ;D ;D You can pump it slow and with little sound but you have to work at it.
From my view i beef up the pumpers so i can just pump 10 or even less times and get more power then a stock 10 pumps so less pumping more power. I really only pump 15 times max for hunting.
Mike
I'm with Croshairs on this one. I did the flat top to get good speed on minimal pumping which for me fits my laziness. ;D
Me I have had fun going through a couple tins of pellets tuning and getting to know my pumpers. I am sticking with the stock pump cup and just going to mod the valve and mild porting on my 1322.
I would like to enlarge valve size from .1 to .13 in order to have psi at the end of the 14.5 barrel about 220 or so
stock is around 208 or so and right now it should be down around to around 158...
that means once enlarged I will have to pump about 3 more times to reach the same pressures.
the fact that there is more give in a rubber pump cup than a flat top setup should help durability while still supplying the cam over effect.
right now I am shooting 20-25-30 yards stock, 20-25 yards with 10 pumps and 30 yards with 12 pumps puts it back to no holdover.
after I finish tuning I will buy a plinker to play, with and shoot my tuners enough to keep my self tuned...
Going after quail, rabbit and dove when young they were skittish enough that the first shot had to count especially with powder burners...
Quote from: BDS on November 11, 2013, 10:08:17 PMHow long does it take to pump 20 or, 40 times?
What do you get (fps or m.e.) in return?
Dunno how long it takes...never timed it. Only pumper I ever pumped 40 times was a modded up .177 with a 20" barrel. Never saw what I'd consider "heavy" use...doubt I put more than a tin of pellets through it in that configuration. It was put together for starlings which to this day continue to occupy a spruce tree "exactly" 55 yards from my porch (not the exact same birds though ;) ). Shot like a laser (7.9gr CPHP @ 980fps on the chrony).
By that time, I was already replacing the roll pin as a matter of course with one made from drill rod and held by E clips. These cannot "walk" or work their way out. I do believe the holes in the tube stretch somewhat...enough that I started changing out the roll pins at any rate.
Ran a .22cal pumper as my main gopher shooting rig for a couple years and did put a LOT of pellets through that one. 15 pumps was "standard", with 25 being used for shots beyond ~40 yards. 15 pumps yielded ~650fps w/ 14.3grain CPHP. 25 pumps was ~720fps w/14.3gr.
Al
For me I go for 15 pumps max,timed this, takes 23 secs.
I have pumped to 20x,but you get diminishing returns for the effort after 15 pumps,and with my build on my 1389 some air retained in valve past 18 pumps.
I read one post where the author regularly pumped 50+ times and said the same thing... WHY?!?
I also have a FTP/V on a 1377 with arm mods for durability and routinely pump past 10. Usually to 15/17 but never past 20, for shooting critters. Probably don't "need" it but with the TKO the blamed this feels and sounds so lame it dosent "seem to have " power. ;) any more than 20 my valve dosent e
Completely evacuate anyway so it's wasted.
I have cronies mine to 800 with light pellets compared to a bit over 600 for 10. So yes define alter ya improvement with more pumps
For plinking absolutely 5/7 is more than plenty. ;)
CW
I had one 1377 that I turned into a .22 cal
I put a heavy hammer spring in, and changed the stock valve spring to a very light one. I had a flat top piston in it too...
I made a vid of pumping it 40 times and dumping all the air on one shot. I don't know if it's still around, but I will look for it.
I agree, the pumpers for hunting you pretty much get one shot. If you hit the animal, and it's not dead immediately, you have to start pumping as fast as you can and get it over with. Sometimes in the time it takes to pump, the critter gets away...and that injured animal is on you. Its up to you to decide if you care or not...
But if you miss that one shot completely, you more than likely won't get another one for a while.
I don't like pumping.
I like co2 sometimes...when it's not 95 out and my shots are all over the place that is!
Over all I prefer pcp guns. Just shoot until you're ready to refill, then keep shooting!
ive pumped mine up to 20 pumps but anything after 15 held air and anything after 12 realy did nothing for the efforts. i do have a stock hammer sprig though so it could get higher velocity but i dont like the effort of pumping it that much. read one thread where a guy pumped his 50 times i think it was. i laughed cause of how hard that had to be. gotta applaud the guy for his sfferts. that had to be hard.
Quote from: onebaddj on November 13, 2013, 01:22:26 AM
ive pumped mine up to 20 pumps but anything after 15 held air and anything after 12 realy did nothing for the efforts. i do have a stock hammer sprig though so it could get higher velocity but i dont like the effort of pumping it that much. read one thread where a guy pumped his 50 times i think it was. i laughed cause of how hard that had to be. gotta applaud the guy for his sfferts. that had to be hard.
Here is the vid and the post thread. I dont know if the vid will open...
why would you want to?
To see what the f happens!
http://www.crosman-air-pistol-owners-forum.com/board/index.php?topic=5311.0 (http://www.crosman-air-pistol-owners-forum.com/board/index.php?topic=5311.0)
Quote from: onebaddj on November 13, 2013, 01:22:26 AM
ive pumped mine up to 20 pumps but anything after 15 held air and anything after 12 realy did nothing for the efforts. i do have a stock hammer sprig though so it could get higher velocity but i dont like the effort of pumping it that much. read one thread where a guy pumped his 50 times i think it was. i laughed cause of how hard that had to be. gotta applaud the guy for his sfferts. that had to be hard.
Here is the vid and the post thread. I dont know if the vid will open...
why would you want to?
To see what the f happens!
http://www.crosman-air-pistol-owners-forum.com/board/index.php?topic=5311.0 (http://www.crosman-air-pistol-owners-forum.com/board/index.php?topic=5311.0)
Video doesn't open.
thats the thread! cant get the video to work though. what hammer spring are you running and how hard is that thing to cock?
Quote from: onebaddj on November 13, 2013, 12:12:33 PM
thats the thread! cant get the video to work though. what hammer spring are you running and how hard is that thing to cock?
I dont remember exactly what springs...i found them in a hardware store.
It wasnt hard to cock at all..the hammer spring wasnt really that heavy. The main thing was to put a very light spring in the valve in combination with the heavier hammer spring. You might get away with only changing rhe valve spring, if you are trying to dump all the air on one shot.
You could put a stiffer one if you wanted to try to go for 2 shots per pump series.
That would be interesting....
Probably a lot of work, but it would be awesome to see it done properly!
when i first got into all this i pumped my 1377s ALOT. up to 40 pumps and i even built one with an external reservoir for an air conserving project. The reservoir was huge and took about 400 pumps to fill it. I learned something important though: OVERPUMPING IS BAD FOR THE GUN. lots of things go wrong and need replaced. 15 pumps should be everyones limit with these things, even with steel pins and properly adjusted pistons..
Quote from: millipede on November 17, 2013, 06:57:03 PM
when i first got into all this i pumped my 1377s ALOT. up to 40 pumps and i even built one with an external reservoir for an air conserving project. The reservoir was huge and took about 400 pumps to fill it. I learned something important though: OVERPUMPING IS BAD FOR THE GUN. lots of things go wrong and need replaced. 15 pumps should be everyones limit with these things, even with steel pins and properly adjusted pistons..
Very good point.
I dont like to pump...let alone 40 times for one shot!
I only have pcp guns...no pumpers in my house except a pink 760.
My stock PC77 is about 505 fps at 10 pumps with no gains at 12 or 15 pumps that is with 7.4g pointed with ultra mag 10.5g it drops to 420 at 10 pumps and climbs back to 470 at 15 pumps.
my 2100 well it only likes the 7.4g pointed and pumping past 10 does not make gains. I just picked up some hollow point premiers and for some reason in it they shoot almost as low as the ultra mag 10.5g. ??? ??? ??? I did not expect that...
At this time over pumping even just to 15 pumps only makes sense in one case with my guns.
Once I enlarge the valve volume I will need to pump more but will be working with the same pressures and feel there will be very little extra wear.