Air Gun Photos

The 410/400 ERB has been around for a while now and I have not seen much written about it. More interest I have in the rifle I realized why. It is sold only in the States and in Poland. So the English can do a write up but chose not to, they only concentrate on their 12 foot pound guns. Come to think of it I have not seen much about the high power guns no matter who makes them. So let me try to write something here.
The 410 is the 10 shot version of the 400 series. ERB stands for Extra high power, Rada, Boris. Those are the chaps that suggested the power mod that this rifle is sold with these days. It is imported my Top Gun Air Guns (T.G.A.G.) 480-513-3778 in the United States. This rifle is different only from the earlier E model by the power mod so lets take a look at it in some detail. It is a silver knob on the right hand side of the receiver and it has marks on the left hand side. There are five marks so a shooter can see where he stands with power. Also the shooter can have more setting the marks are only suggested and are dot intents. What gives the rifle something different in power is a relatively simple ball valve. It opens and/or closes the port minimizing the air going through the port. I like this system the best, as I should, since it has a positive closing. Meaning it does not have any air blow by giving a more consistent air flow. The screw in middle of the port as was in the AA 310/300 series and is still used in the S200 does not change the power that much. By that I mean it can change it by couple of hundred fps but it will not give anywhere this kind of range of velocity. In fact when I had my 310 and in my current S200 I use the port screw as a refining adjustment. I set my velocity by other means and then refine the accuracy by moving the screw in or out by quarter turns. It is amazing how much more accuracy I can squeeze out of the rifle using this system. In my opinion it should have been called a “accuracy tuning screw.” The reason is the screw moved in or out of the transfer port changes the size of the opening. And it creates turbulence which is created by the air going around the screw. By changing the turbulence some pellets will like it some will not. That is why it in my opinion it will change the accuracy as well as some velocity.

    I picked a .177 to test this time for a number of reasons. I thought this could be a nice all around rifle from hunting to just quiet plinking and anything in between. Also the .177 is preferred for field target and the pellets are generally half the price of the .22. But for hunting I still like the .22 much better. And I was very interested how the JSB heavy shoots out of different rifles.
     Using a 8.4 grain JSB pellet I recorded 526 feet per second on the lowest setting and 1046 feet per second on the highest. The high setting is too close to supersonic for my liking. I believe in summer here it will reach supersonic and it will loose accuracy.    But the 10.1 grain JSB heavy on max setting moves the pellet at 984 fps. Much better, and in fact more accurate then the 8.4 pellets. With the heavy pellets here are the stats;
At 25 yard.
Min. group c.t.c. .179
Max group c.t.c. . 301
Avg for five, five shot groups .282
Velocity 984 fps
     Then I moved the setting on the middle mark and the velocity was 1012 fps with the light 8.4 JSB’s. And with the heavy it was still above 900 at 966, not much of a velocity loss for the pellet. Here are the stats how the 8.4 and the 10.1 fared;

At 25 yards 8.4 JSB
Min group c.t.c. .394
Max group c.t.c. .471
Average c.t.c..410
Velocity 1012 fps
---------------------------
At 25 yards 10.1 JSB
Min group c.t.c. .247
Max group c.t.c. .416
Average c.t.c. .330
Velocity 966 fps

The lighter pellet did far better but nothing sterling. Here is the second from the lowest setting, here are the stats on that;

At 25 yards 8.4 JSB
Min group c.t.c. .182
Max group c.t.c. .268
Average c.t.c      ..225
Velocity 788 fps
---------------------------
At 25 yards 10.1 JSB
Min group c.t.c .128
Max group c.t.c. .313
Average c.t.c       .220
Velocity 745 fps

Seems to me here we have some very respectable velocity with both pellets. Not the magnum velocity which a lot of people seem to gravitate to but respectable velocity I was amazed how well the heavy pellet performed. All this time I was thinking it is a pellet best suited only for the magnum powered air guns.

One thing I noticed when the velocity goes below 800 fps the heavy and the light pellet seem equally accurate. But then that is not a surprise since the 8.4 JSB was designed for much slower velocities and the 10.1 JSB for longer range and more velocity. The lowest velocity did not seem to interest me since I have target rifles that will do just that velocity and sometimes more. But someone who is interested in one rifle that does a lot of things this could be the one hands down. I did shoot some on the lowest setting with the 8.4 and the rifle seemed apartment quiet. But be careful when reading this, sound is a very subjective topic. What I can’t hear others may hear and since I don’t have any way of measuring the decibel level I have only an opinion. This rifle is definitely an all around tool but a reminder that a shooter needs to keep a log of settings and pellets. When the velocity is changed the point of impact will change. I am sure I don’t have to remind most, but in some cases the impact will be slightly to one side. So a log of elevation and windage to a pellet and power setting needs to be kept. Not that big a deal unless a shooter likes to change pellets like socks. Then the log can get extensive. But lets say a lighter pellet for 3 of the 5 marked settings. Then a change to one of the heavier pellets for the higher settings, and that should do. The long in that case will not be extensive in the least. It is one of the more refined rifles out there. A keeper for sure.

RN102A BOLT HOUSING FIXING SCREW	S483 CYLINDER END CAP
RN113 BARREL FIXING SCREW	S484 FRONT CLAMP RING
RN135 BODY LOCATION SCREW	S490 FILLING VALVE BODY
RN170 TRIGGER STOP PIN	S495 TOP SEAR SPRING
RN191 TRANSFER PORT ADJUSTER	S496 SPRING SCREW
RN193 MAGAZINE RETAINING CLIP SCREW	S500 BOLT HOUSING
RN234 SEALING RING	S501 BOLT HOUSING BUSH .22
RN235 CYLINDER TUBE (CARBINE)	S502 BOLT HOUSING BUSH .177
RN250 PRESSURE INDICATOR GAUGE	S505 MAGAZINE RETAINING CLIP
S298 VENTURI ADJUSTER SCREW	S507 FIRING VALVE BODY
S303 LOCKING SCREW	S515A MAGAZINE OPERATING POST ASSY
S306 FIRING VALVE SPRING	S520H STRIKER
S310 STRIKER BODY	S520-1 STRIKER BUSH
S312 TRIGGER CHASSIS	S525 MAIN SPRING SPACER
S315 TRIGGER GUARD	S530 MAIN SPRING GUIDE
S316 TRIGGER GUARD SCREW	S536 BARREL (.177) & GAUGE MOUNT SEAL
S319 TRIGGER WEIGHT OF PULL SPRING	S538 BARREL SEAL (.22)
S320 TOP SEAL	S546A LOADING BOLT ASSEMBLY .177
S322 TRIGGER CHASSIS SCREW	S546B LOADING BOLT ASSEMBLY .22
S324 TRIGGER CHASSIS COVER SCREW	S550 SIDE PLATE
S325 BOTTOM SEAR	S555A MAGAZINE ASSEMBLY .177
S326 TRIGGER CHASSIS PIN (SMALL)	S555B MAGAZINE ASSEMBLY .22
S328 CHASSIS PIN SPACER (LARGE)	S560 CAMPLATE
S329 CHASSIS PIN SPACER (SMALL)	S565 SIDE PLATE SCREW
S331 MAIN SPRING	S580 SOUND MODERATOR
S335 CYLINDER TUBE (STD)	S581 MODERATOR SCREW
S340 STRIKER GUIDE ROD	S625 STOCK SCREW
S345 LOADING BOLT SCREW SLEEVE	S630 BEECH STOCK RH
S355 LOADING BOLT SCREW	S632 WALNUT STOCK RH
S360 FIRING POT	S634 WALNUT THUMBHOLE STOCK RH
S370 FIRING VALVE ASSEMBLY	S635 WALNUT THUMBHOLE STOCK LH
S403A BARREL .22 (STD)	S640 PRESSURE GAUGE MOUNT FOR S645
S403B BARREL . 177 (STD)	S640W PRESSURE GAUGE MOUNT FOR RN250
S403F BARREL .22 (CARBINE)	S641 GAUGE MOUNT SCREW
S403G BARREL .177 (CARBINE)	S645 PRESSURE INDICATOR GAUGE
S420 TRIGGER BLADE	S646 PRESSURE GAUGE SEAL FOR S645
S421 TRIGGER ADJUSTER SCREW	S650 LOADING BOLT BUFFER
S425 LOADING BOLT HANDING PIN	S655 STOCK SCREW WASHER
S427 BOLT HOUSING/BODY SEAL	TX228 CYLINDER CLAMP SCREW
S430 TRIGGER CHASSIS COVER PLATE	TX236 CHASSIS SCREW
S459 MUZZLE END	TX239 MUZZLE END SCREW
S459S MUZZLE END FOR OPEN SIGHTS	TX381 TRIGGER WEIGHT OF PULL ADJ SCREW
S465 BONDED SEAL	TX398 CHASSIS PIN (LARGE)
S468 FEMALE SNAP CONNECTOR	TX432 TRIGGER ADJ SCREW LOCKING PAD
S470 MALE SNAP CONNECTOR	TX460 TRIGGER CHASSIS SCREW
S482 FRONT CYLINDER CLAMP