PP700 adventure started(Artemis PP700s-a)

[Backyard Shootr]

Woke up this morning with a email from Huma my regulator has shipped. We shall see how long it takes to get to my door.

[nervoustrigger]

Well I gave in and decided to bump up the tune on my .177 a little.  Adjusted the regulator and hammer spring to take it from 560fps to 640fps...from 6.5fpe -> 8.5fpe with 9.3gr RWS Supermags so it would be better suited to 30yd pesting duty.  Got it producing a stable velocity over the chronograph and then began re-zeroing the scope. 

It’s all over the place now.  What were 1/4” - 1/2” groups at 25 are now over 1”.  On a whim I’m going to try adjusting the barrel nut tension and see if it makes any difference (possible harmonic issue) but suffice it to say I did not expect it to fall apart like that.

Just a short cautionary tale that it’s sometimes better to leave well enough alone.

[Backyard Shootr]

Is there any body out there that is making precision barrels for the PP700?

[Pelletjunkie]

Is there any body out there that is making precision barrels for the PP700?

I just built my own. I didn’t figure anybody was making barrels that were worth as much as the gun. Don’t put the cart in front of the horse, your stock barrel might be pretty good. Mine was. I could always find pellets it liked. Sometimes had to adjust the velocity a little.

[Sfttailrdr46]

  Mine .22 is now shooting nickel size groups at 10 yards off a rest using a red dot sight so I am smiling right now. I did pull the barrel and re crow the barrel and slight chamfer to the breach to allow the pellets to feed a little easier . Now with the fresh pellet ramp breach block I am really liking this little pop gun 

[JungleShooter]

So, what is a pellet ramp breach block..?
And where do I get one?

And what o-rings exactly will I need for a .22?
And where would I get those?

Thanks, guys — through providence I soon get to be member in your PP700 club. 

[Sfttailrdr46]

PM this Member MonsterMaxx or check with JSAR they also made a version of the roll out breach block with pellet ramp Basically if you look at the rear of the PP700 S-a the breach block rotates off to the right allowing you to insert the pellet into the breach. Both aftermarket blocks have a groove cut into the left side of the block so when you rotate the block to the right the groove provides a nice easy place for the pellet to guide into the breach.

Do you need it maybe not but for ~$25 USD it saves a whole lot of fumbling around when you are trying to load a pellet into the pistol 

[Harold999]

The standard open sights, for which distance are those designed? Couldn't shoot further away than 15ft yet with my new 700, but the sights are far from optimal for those short distances. 
And no adjustment 

[nervoustrigger]

Quick update on the unsuccessful uptune.

1.  Varying amounts of tension on the barrel nut did influence the tightness of the groups but I could not get it to group as well as it had before at the lower energy level.
2.  I tried 10 different types of pellets to see if perhaps the new tune happens to prefer a different pellet.  Found a couple that looked pretty good, H&N Sniper Mediums and RWS Superdomes, but since I don't have much stock of them and I have stockpile of 15,000 of the RWS Supermags, I decided to try going back to the previous tune.

And let me tell you, i was sweating it. I knew it was quite possible that I wouldn't be able to get it back quite like it was before, particularly since it was tricky to get it to produce a flat shot string the first time around.

After some ping pong with the regulator and hammer spring, I had it back to the previous velocity and it seemed to be holding flat with the reservoir at high/mid/low pressure.  So I went ahead and reattached the grip and the folding stock and sat down to re-zero it at 25 yards.  Six pellets later I had a rough zero.  A couple of five shot groups said I needed 3 clicks of windage.  The next five pellets took out five 3/8" Mardi Gras beads hanging from the target board.  That's a great weight off my mind.

Sometimes the difference between a PCP that's bleh and a PCP that's great is the twist of a couple of screws.

[Thane]

My experience in tuning this pistol was very similar, small changes can lead to inconsistent results. It took quite a bit of searching, but once I landed on a flat string I kept it there, that has held for over 6 months. It does a very consistent 830-840 FPS for 38 shots with H&N Terminators  7.25 gr making near 3/8" groups at 25 yards. I broke it out last night for another check and it's held air for a month, same velocities.

Thinking about picking one up in .22...

[Rocker1]

38 shots 840s?? Wow!!! Done quiet a few never got that.  But didnt use that grain pellet. David

[nervoustrigger]

Yeah that’s impressive.  The total fpe is about 20% less than I’m getting but I’m running a low power tune.

You may have told us but did you install a longer barrel?

[anti-squirrel]

Mine's been doing well at a lower tune- now dropped to 10-ish FPE and I'm still tickled pink with the accuracy.  I must have got one with a perfect barrel- RWS Meistekugeln kill last night on a treerat.

[Pelletjunkie]

Ok, my PP700 is finally done and I am happy with it. As I stated before it was an awkward pistol and a goofy, kinda flimsy compared to my Leshiy carbine. I bought it for a pistol that I can just grab when I go investigate a downed critter or when I go fill my feeders. It took a couple months of barrel building, measuring and some gambling. It is now a balanced pistol that shoots 10.5’s 640fps and 7.3’s 760fps with great accuracy. I played with a couple barrel and shroud combos but it seemed to like barrel tension. So I made a steel threaded adapter, flat sided it so I can tighten it with a wrench and put a target crown on it so it doesn’t look shoddy. I then blued it and made a nice cap for the threads. I am using a LW 8.5” barrel and Huma reg. I get 15 shots on the reg and it is a total of 26 pumps to refill it. I have watched every thread on this gun an was very surprised that nobody went this direction. Everyone just keeps making the already big gun bigger. Total investment $640 plus my labor. Still cheaper than my Ataman AP16.

[Backyard Shootr]

Ok, my PP700 is finally done and I am happy with it. As I stated before it was an awkward pistol and a goofy, kinda flimsy compared to my Leshiy carbine. I bought it for a pistol that I can just grab when I go investigate a downed critter or when I go fill my feeders. It took a couple months of barrel building, measuring and some gambling. It is now a balanced pistol that shoots 10.5’s 640fps and 7.3’s 760fps with great accuracy. I played with a couple barrel and shroud combos but it seemed to like barrel tension. So I made a steel threaded adapter, flat sided it so I can tighten it with a wrench and put a target crown on it so it doesn’t look shoddy. I then blued it and made a nice cap for the threads. I am using a LW 8.5” barrel and Huma reg. I get 15 shots on the reg and it is a total of 26 pumps to refill it. I have watched every thread on this gun an was very surprised that nobody went this direction. Everyone just keeps making the already big gun bigger. Total investment $640 plus my labor. Still cheaper than my Ataman AP16.

You shortened the air chamber as well? What's on the side of the breech?

[Thane]

Stock barrel, between 830 and 840 FPS averaging 11 FPE, with a lighter pellet the 7.25 Terminator which was grouping well for me and others.

[Pelletjunkie]

Ok, my PP700 is finally done and I am happy with it. As I stated before it was an awkward pistol and a goofy, kinda flimsy compared to my Leshiy carbine. I bought it for a pistol that I can just grab when I go investigate a downed critter or when I go fill my feeders. It took a couple months of barrel building, measuring and some gambling. It is now a balanced pistol that shoots 10.5’s 640fps and 7.3’s 760fps with great accuracy. I played with a couple barrel and shroud combos but it seemed to like barrel tension. So I made a steel threaded adapter, flat sided it so I can tighten it with a wrench and put a target crown on it so it doesn’t look shoddy. I then blued it and made a nice cap for the threads. I am using a LW 8.5” barrel and Huma reg. I get 15 shots on the reg and it is a total of 26 pumps to refill it. I have watched every thread on this gun an was very surprised that nobody went this direction. Everyone just keeps making the already big gun bigger. Total investment $640 plus my labor. Still cheaper than my Ataman AP16.

You shortened the air chamber as well? What's on the side of the breech?

Shorter barrel, shroud and air chamber. Pellet dispenser.

[Rocker1]

 Dont see how you getting that many shots at those speeds with that small air tube. David

[Backyard Shootr]

Ok, my PP700 is finally done and I am happy with it. As I stated before it was an awkward pistol and a goofy, kinda flimsy compared to my Leshiy carbine. I bought it for a pistol that I can just grab when I go investigate a downed critter or when I go fill my feeders. It took a couple months of barrel building, measuring and some gambling. It is now a balanced pistol that shoots 10.5’s 640fps and 7.3’s 760fps with great accuracy. I played with a couple barrel and shroud combos but it seemed to like barrel tension. So I made a steel threaded adapter, flat sided it so I can tighten it with a wrench and put a target crown on it so it doesn’t look shoddy. I then blued it and made a nice cap for the threads. I am using a LW 8.5” barrel and Huma reg. I get 15 shots on the reg and it is a total of 26 pumps to refill it. I have watched every thread on this gun an was very surprised that nobody went this direction. Everyone just keeps making the already big gun bigger. Total investment $640 plus my labor. Still cheaper than my Ataman AP16.

You shortened the air chamber as well? What's on the side of the breech?

Shorter barrel, shroud and air chamber. Pellet dispenser.

I like it. Nice work.

[Pelletjunkie]

Dont see how you getting that many shots at those speeds with that small air tube. David

I do. Lots of experimenting with the valve for peak efficiency has helped for maybe 3 more shots. Not important if you are getting 30+. But 15 is better than 12.