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 Post subject: Polymag pellets
PostPosted: Wed Jan 25, 2017 8:56 am 
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Joined: Fri Dec 20, 2013 10:14 am
Posts: 30
Location: Constance Bay, Ontario
Hi all,
been a while since I posted, but still very active in airguns.
Had some fun testing a few pellets in home made ballistic jelly in the last few weeks.
I focused on a few wad cutters and dome pellets and the polymag.
Guns used were Diana mod52 .177 and Gamo Magnum .22

This may not be the right subject for general chat, so moderators please move it if necessary.

Short version of the testing results, which by the way was very fun with some cool results.
The domes by far had the most penetration with very little expansion, and smallest impact mark.
The Flat heads the least penetration, the biggest impact, and decent expansion.
The poly mag had really good penetration, impact that was very close to the flat head, and excellent expansion tract damage and near perfect mushroom was really impressive.
Most rounds were in the 800 - 900 fps range in .22 except for a heavier 21 grain copper coated pellet which went the farthest into the jelly by a large margin and 900 - 1000fps in .177
Primarily the FPE was close to each other with the weight variation in each caliber.
I have a lot more data, but in the Gamo Magnum .22 (A new gun for me) the polymags would be a great hunting round for both impact and expansion. and they shoot very accurate out of the gun. Rested testing is very consistent at 50yds.
For this gun, the polymags would be an excellent hunting pellet for medium critters, keeping in mind that it drops the polymer tip early in the tract.
So if you are cooking what you kill, then you would want to find it or eat it.
Flatheads would be an excellent small critter ammo for a quick kill.
Overall, not surprising, but I thought I would share the experiment.

I had previously tried some lower powered guns, sub 500 FPS, but they could not get any amount of real expansion, other than the skirt.
The photos show:
Accuracy in a 3" target at 50yds.
The polymag tract in the jelly.
Side by side results of the pellets before and after.
I have more data, like measured tract length, FPE/FPS gr. weight etc. jelly recipe, if anyone wants more info.


Attachments:
6rnds.jpg
6rnds.jpg [ 160.83 KiB | Viewed 645 times ]
pellet expansion.jpg
pellet expansion.jpg [ 203.86 KiB | Viewed 645 times ]
jelly polymag.jpg
jelly polymag.jpg [ 168.9 KiB | Viewed 645 times ]

_________________
Cheers,
Rick
Beaman GT650 .177
Benjamin NP XL1100 .22
American Classic model 1377 tuned and custom grip and stock .177
Winchester Model 1000X in .177
Diana Model 52
Baikal 53m .177
Crossman Vigilante .177
Diana Model 6 .177
Slavia 620
Gamo Magnum .22
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 Post subject: Re: Polymag pellets
PostPosted: Wed Jan 25, 2017 10:52 am 
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Joined: Mon Sep 29, 2014 1:41 pm
Posts: 13
Location: South River, Ontario
I too have recently acquired a Gamo Magnum in .22. Love the gun. I don't have a Chrony though. Do you have FPS readings with other pellets? Would really be interested in those numbers if you have them or get bored and want to measure them. :D I have been using modelling clay for tests. Dramatic results!

_________________
1976 Sheridan Blue Streak .20
1977 Webley Hurricane .177
early '80s Slavia 630 .177 (tack driver!)
Gamo Magnum .22 (sweet rifle!)
Beeman QB Chief .22 (a new favourite)
Beeman P17
Umerex Colt Commander blowback

too many powder burners to list!


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 Post subject: Re: Polymag pellets
PostPosted: Wed Jan 25, 2017 12:54 pm 
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Joined: Fri Dec 20, 2013 10:14 am
Posts: 30
Location: Constance Bay, Ontario
With PBA it was at 1187 after break in.
Below are the results for other pellets.

Cal Pellet FPS GR. Weight FPE Joules

0.22 polymag 879.00 16.00 27.46 37.23
0.22 Stoeger domed copper coateds 659.00 21.12 20.37 27.62
0.22 rws professional line wadcutters, flathead 964.00 14.00 28.90 39.18
0.22 crossman red flight pointed 832.00 16.70 25.68 34.81

I pulled this out of a software on my PC so it may not format in columns correctly.
Not the speeds I was hoping for, but I have not tuned this one yet, so hoping for an improvement afterwards.
Still a hard hitter and quite accurate.
My Benjamin xl1100 pushes the polymag about 90 FPS faster for comparison.
But this gun has a nicer stock trigger and is considerably lighter, so I am more accurate freehand shooting with it.

_________________
Cheers,
Rick
Beaman GT650 .177
Benjamin NP XL1100 .22
American Classic model 1377 tuned and custom grip and stock .177
Winchester Model 1000X in .177
Diana Model 52
Baikal 53m .177
Crossman Vigilante .177
Diana Model 6 .177
Slavia 620
Gamo Magnum .22


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 Post subject: Re: Polymag pellets
PostPosted: Mon Jun 05, 2017 9:05 am 
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Joined: Mon Sep 29, 2014 1:41 pm
Posts: 13
Location: South River, Ontario
Somehow missed the reply. Thanks for the info.
I did finally get a Chronograph!
Here are some results for those interested.
Gamo Magnum
Crosman Premier Ultra Mags 14.3gr, 920 fps
JSB 15.89gr, 870 fps
H&N Barracuda 21.14gr, 700 fps
Stoeger X-Hunt 15.74gr, 870 fps (not very accurate at range in this gun)
Predator Metal Mag 17gr, 860 fps
Gamo PBA bullet (copper) 14.4gr, 900 fps
Gamo Masterpoint 15.43gr, 860 fps
Gamo TS-22 22gr, 700 fps
Gamo Hunter 15.43gr, 860 fps
Gamo Magnum 15.43gr, 860 fps
Crosman Piranha 14.3gr, 910 fps
Crosman Hollowpoint 14.3, 910fps
Beeman Crow Magnum 18.21gr, 765 fps
H&N Hunter Extreme 19.09gr, 765 fps (most accurate at time of testing)
The Gamo Magnum .22 seems to do best with 16 to 21gn pellet. (at least that seems to be the case with mine) The crosmans are fast but I find they group 2" at 25 yds (ok for cans but not smaller targets) The JSB, Metal Mag, H&N and Gamo Hunter are good (1" or less groups at 25 yrds)

Hope this helps. Anyone else have a Gamo Magnum and would like to add to this please do.

David

_________________
1976 Sheridan Blue Streak .20
1977 Webley Hurricane .177
early '80s Slavia 630 .177 (tack driver!)
Gamo Magnum .22 (sweet rifle!)
Beeman QB Chief .22 (a new favourite)
Beeman P17
Umerex Colt Commander blowback

too many powder burners to list!


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 Post subject: Re: Polymag pellets
PostPosted: Mon Jun 05, 2017 10:19 am 
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User avatar

Joined: Mon Sep 29, 2014 1:41 pm
Posts: 13
Location: South River, Ontario
My Slavia 630 shoots the Polymag pellets (8gr, .177) at 560 fps. Not bad for a 30+ yrs rifle. Still probably the MOST accurate of all my air rifles. Nearly boring as you CAN'T miss out to 40 yds.
My Webley Hurricane shoots the (8gr, .177) Poly's at 413 fps (also not bad for a 40 yr old pistol)
Finally my 41 year old Sheridan Blue Steak at 8 pumps is 660 fps (13 grain, .20 cal Polymag)

David

_________________
1976 Sheridan Blue Streak .20
1977 Webley Hurricane .177
early '80s Slavia 630 .177 (tack driver!)
Gamo Magnum .22 (sweet rifle!)
Beeman QB Chief .22 (a new favourite)
Beeman P17
Umerex Colt Commander blowback

too many powder burners to list!


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 Post subject: Re: Polymag pellets
PostPosted: Mon Jun 05, 2017 2:04 pm 
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Joined: Wed Jan 05, 2011 12:35 pm
Posts: 6088
Location: P.G. B.C.
Polymags (red plastic tip) shoot well in all my rifles - from .177, .22 & .25.

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Best Wishes
Daryl


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