Gamo Swarm Magnum or Bone Collector?

[MontanaMarine]

Here's some more shooting results from today.  I put about 100 more pellets down the pipe, figuring out the best hold for accuracy.

I found best consistent accuracy using a loose hold on the forearm, a firm grip on the pistol grip, minimal cheek contact, and light contact on my shoulder.

I was shooting at 27 yards.  10-20 mph wind from 4-5 oclock.





Best 5-shot group with JSB 18.13gr, 1/2" ctc.


Best 5-shot group with Crosman CPHP 14.3gr, 5/8" ctc.

[Toxylon]

Chrono results, Gamo Magnum Gen3i.  Elevation 4000 ft.

JSB 18.13 - 781 fps, 25 ft-lbs

The G-Magnum is sold as a 45J (33 fpe) gun. Your highest KE, with those Exact Heavies, works out to 34J, a pretty massive difference.

Living at sea level, and never at any other, I have no idea how much the velocity is affected by the 1.2km elevation, though.

[uglymike]

Chrono results, Gamo Magnum Gen3i.  Elevation 4000 ft.

JSB 18.13 - 781 fps, 25 ft-lbs

JSB Hades 15.89 - 767 fps, 21 ft-lbs

Crosman CPHP 14.3 - 846 fps, 23 ft-lbs

I was surprised the Hades were slower than the 18.13gr.  Maybe something to do with alloy hardness or something.

thank you for those numbers sir

[uglymike]

looks like it's Pdog and jackrabbit worthy   

[MontanaMarine]

Chrono results, Gamo Magnum Gen3i.  Elevation 4000 ft.

JSB 18.13 - 781 fps, 25 ft-lbs

The G-Magnum is sold as a 45J (33 fpe) gun. Your highest KE, with those Exact Heavies, works out to 34J, a pretty massive difference.

Living at sea level, and never at any other, I have no idea how much the velocity is affected by the 1.2km elevation, though.

Well, I had a Hatsan 125 Sniper QE, 25 caliber.  with the JSB 25.4gr, it could only get 690 FPS here.  I had seen and talked with a few other owners of the same gun, who were at lower elevations, and they were all seeing around 750 FPS with the same pellet.  So the difference is very real.

[MontanaMarine]

I posted a short vid on YouTube doing the chrono testing.  I was getting several arrors, so I edited a bit of that out.





Shane

[Toxylon]

The 'headliner pic' in your YT clip illustrates nicely how long the G-Mag is. I reckon the Whisper can adds a little length, too?

[MontanaMarine]

The 'headliner pic' in your YT clip illustrates nicely how long the G-Mag is. I reckon the Whisper can adds a little length, too?

Yes the Whisper can adds 6-7 inches.  The rifled barrel is only 14" (I measured it).  Gamo advertises the barrel at 21 inches, so that clearly includes the moderator.

[triggerfest]

Actually, how is the mag (mechanism) functioning ?

From the video it seems to be flawless, no ?

[MontanaMarine]

Actually, how is the mag (mechanism) functioning ?

From the video it seems to be flawless, no ?

Yeah it has been flawless.  My only Swarm gun, but I'm really liking the system.

[triggerfest]

Actually, how is the mag (mechanism) functioning ?

From the video it seems to be flawless, no ?

Yeah it has been flawless.  My only Swarm gun, but I'm really liking the system.

Cheers...

That's what I thought. Looking at the groups you have been shooting, you can't achieve that with damaged pellet skirts from the magazine.

[MontanaMarine]

I intend to get some shooting vid here pretty soon.  33F, windy, and snowing here today.  Not really a fun day to do airgun shooting/testing.

[MontanaMarine]

Shooting some steel at 42 yards with the JSB 18.13gr,

[kzz1kaw]

Found this channel and he is shooting the Gamo bone collector @ 62 yards

[MontanaMarine]

That's some nice shooting with the Bone Collector.

[Back_Roads]

 I shot a 3 shot holes touching group with a buddies .177 Gamo Mach1 holes connecting group l quit @ 3 not to ruin it
 Almost got me to buy a Gamo, but they never get deep discounts like many other brands.

[Toxylon]

There's something to James' observation: Gamo discounts, if they even exist, are typically in the 10 - 20 % range, or not much anything. Coupled with the fact that the bigger Gamos are vastly overpriced for what they are (600 bucks for a Hunter 1250???), it's hard to (re-)hop on the Gamo train.

Shane,

How's the loudness-to-shooter with your G-Magnum? I would think having a plastic stock, a very large powerplant, plus low overall mass would make the G-Mag bark pretty loudly into the shooter's ear.

[19Sheridan57]

   You have to work at it to find Gamos that are discounted very much. I got lucky a couple of times & picked up nice refurbs. Keep an eye on Gamo's Outlet store, Midway , Sportsman Guide , etc . This site below. usually has some older model refurbs . You have to set up an account, spend $100 , to buy from them, but they don't ask for tax. I.D., business info, etc.

https://www.dpciwholesale.com/search.php?mode=search&page=1&keep_https=yes

[MontanaMarine]

There's something to James' observation: Gamo discounts, if they even exist, are typically in the 10 - 20 % range, or not much anything. Coupled with the fact that the bigger Gamos are vastly overpriced for what they are (600 bucks for a Hunter 1250???), it's hard to (re-)hop on the Gamo train.

Shane,

How's the loudness-to-shooter with your G-Magnum? I would think having a plastic stock, a very large powerplant, plus low overall mass would make the G-Mag bark pretty loudly into the shooter's ear.

I seems fairly quiet to me.  I'd say it's a bit quiter than my Hatsan 125 Sniper QE.