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PostPosted: Sat Oct 20, 2018 12:12 pm 
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Joined: Tue Oct 18, 2011 12:21 pm
Posts: 429
Location: Ontario
I was attracted to the Artemis LR700W by the fact that it was a 7 pellets magazine fed pumper with a capacity of two consecutive shots after being pumped 5 times.

Mine was one that have been tuned by Wes before shipping (enlarged transfer port and weaker hammer spring).

I received it on October 16th but I was waiting to experiment with it a bit before posting.

The same as for Doc Sharptail, my first impressions were positive. The wood stock is nice and the metal bluing (except for a tiny scratch on the barrel) is fairly even.

If you want to see some pictures of the rifle he has some good one in his post.

The LR700W is about the same length and weight as a QB Chief rifle. It is not very heavy and is comfortable to handle when shooting. Pumping is another story.

This requires some strategy. Instinctively you would want to keep the hand with which you shoot (the one working the trigger) where it is and the hand that was on the forearm would be used to manoeuver the pump handle. This will be OK for the first two pumps but the third one will be very hard to complete. Furthermore trying to pull on the handle to start the pumping action is very difficult.

The secret is hands position. By moving the shooting hand to the space between the breech and the sight and having the other hand on the pump handle, they are now practically at the same level. The hand that is on the rifle is slightly lower but you don't want to pinch your fingers so it is OK. Now you have a (nearly) isometric position that could work to your advantage.

The idea is to pull both hands away on each side of the body so the pump pivot is aligned with your vertical center line (or in front of your breastbone) and after full extension you bring back both hands together effectively closing the pump with equal force from both hands (push with the palm of the hand on the pump handle and keep your fingers out of the way).

The other trick to get the pump handle out of its locked or closed position is to hold the forearm near the separation and with the thumb push on the base of the pump. Just a bit of pressure will move the handle away from the rifle body.

Before starting the velocity testing I did some experimentation with pumping and dry firing to understand when there is residual air left in the reservoir and also how much force is needed for the pumping. One to four pumps is fairly reasonable but from five to eight it gets a lot more difficult (with eight I was barely able to bring it home). From six to eight pumps the residual air for the dry fired shot is very noticeable. I am not sure if there would be enough at eight pumps to have a third workable shoot ( I didn't want to take the chance to chrony it).

At this point I have about 200 chronied shots through the rifle and I am starting to understand what can or cannot be done.

According to Wes's site it should be possible to obtain 2 shots with 5 pumps. He also mention in another post concerning the tuning he did that the rifle should be dry fired between each double shots. I found that it would be annoying so I wanted to verify what would happen without dry firing.

My first string was looking like that:

5 pumps for each set of 2 shots (no dry firing in between).

492.2
472.1
490.7
473.9
491.3
471.3
495.8
480.6
495.6
496.7
492.2
499.7
Not registered
498.9
The way it looks is that the air is exhausted or nearly exhausted after 2 shots because the first one is slightly more powerful than the second. This hold true until the middle of the string where both shots started to be similar (so there might be a litlle bit of accumulated air after all).

It has to be kept in mind that it takes some time before a rifle settles (it is said that it could be as much as 500 shots). So as I was continuing my test I started to experience a shift in pattern as the first shot became faster (above limit) and the second slower than what is shown in my first string (around 450 ) but gave about the same two shots average. On the other hand two unequal shots is not the best for accuracy so as I didn't want to enter forbidden territories, I decide to change strategy and experiment with pumping for every single shots.

Anyway the more consecutive pumps the more energy is expanded. Doing 2 times 3 pumps is a lot easier than doing a single 6 pumps (which would be too tiring to do over a long shooting session).

So I experimented with 2 pumps and 3 pumps for each single shot and the results are not too bad. Except for a few places where I got a result not in line with the balance of the string the number are fairly close together. They are low 400 fps for 2 pumps and high 400 fps for 3 pumps.

At the distance I have available for shooting (between 25 and 31 feet) that is all I need.

The list below contains several strings for 2 pumps then several other for 3 pumps

2 pumps
408.3
410.1
406.2
402.4
403.6
402.8
404.6
399.2
400.9
401.7

403.8
308.5
408.0
408.6
408.3
300.9
406.3
408.4
404.5
409.3
412.7
408.4
406.5

411.3
411.0
410.8
413.8
411.3
411.5
409.9
466.7
412.7
409.2
406.2

3 pumps
477.4
485.8
496.3
473.4
489.1
495.5
476.0
484.5
493.1
477.1

473.0
484.8
492.2
486.9
496.1
479.6
493.7
475.7
488.1
481.3

471.3
475.4
479.1
482.2
484.5
488.2
490.2
485.7
487.9
489.7

459.2
464.5
469.8
463.1
466.5
471.8
473.0
471.1
471.2
472.5

I hope the info can be useful to others.

R-Gun Pete


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PostPosted: Sat Oct 20, 2018 1:39 pm 
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Joined: Mon Aug 15, 2016 11:00 pm
Posts: 191
Tested mine to be the same as your result, so far what my solution for and easy pumping is to lightly grease the pump joint and it works a lot better, another part that I have done is to try to lessen the pumping clanking sound by anti slip padding in the pump, its been very nice, reduce the loud clanking sound when pumping.


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PostPosted: Sat Oct 20, 2018 2:53 pm 
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Joined: Sat Nov 05, 2016 10:52 am
Posts: 2404
Location: Caronport, Saskatchewan
Thanks so much for sharing guys, I'm glad to see the retained air is not really causing much problem other than effecting the two shot pattern. Thanks so much! Also good to have tips on easier pumping.
Cheers,
Wes

Sent from my LG-M154 using Tapatalk


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PostPosted: Sat Oct 20, 2018 3:33 pm 
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Joined: Wed Oct 17, 2007 3:27 am
Posts: 2473
Location: Winnipeg, Canada
Interesting. I should run out and try and find some Gunslick anhydrous graphite today before everyone closes....

-D.S.

_________________
"Ain't no half-way"
-S.R.V.

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