Pellet testing

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Posted: 30 Jul 2024 at 12:24pm

Well it does say "Formidable Protection"

kruzaroad

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Posted: 30 Jul 2024 at 12:20pm

So in the interest of getting the most out of me old work boots, decided to shoot them to see what differnt pellets did out of same gun at 10 pumps @20m.
Not overly exciting, penitration through leather, but that was it didn't make it through thin layer of foam or gortex lining.
Pellet damage minimal with both the AA 16gr and h&n fft showing no ill effect and would have been reshootable.
You can see the AA still in the leather on your right .
Hades suffered enough skirt damage to not be usable again, and very slight head damage. But.....

Due to the fact skin isn't dry I decided to soak the Tounge in water for 10min and see what happened. Hoping the hydrostatic shock of water in the leather would open the pellets up.
The resault

NOT ONE PELLET PENITRATED the leather.
Go figure. Definitely didn't think that would happen.
The gun is putting out around (slightly over or under) 7fpe with hades 15.89gr at muzzle, last time I did a reading on it.

Edited by kruzaroad - 30 Jul 2024 at 6:46pm

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Posted: 21 Apr 2024 at 9:55am

Great idea!
Gawd dam right tool wrong tip.

Whats the dimension of your bullet tip? Might be able to cut lead off top. (after I separate the powder and fire primer)

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Posted: 20 Apr 2024 at 3:40pm

For the odd bent skirt I use a dummmy 308 round with 130g speer hollow point projectile, which is perfect for pushing the skirt back into shape. Quick & simple.

Edited by flock - 20 Apr 2024 at 5:36pm

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Posted: 18 Apr 2024 at 9:21am

Sigh one more thing to check.
Time consuming, not fun, always interesting, amazing some of the tins I've had,especially the cheaper ammo, why I gave up on gamo pellets.
(Though the red fire and one with ball bearing in nose have always given me good results (but never the best).
Still if I'm hoping to constantly shoot from 60m to 90m accurately better get rid of all the variables, so I can adjust what I'm doing and not blame a pellet for bad shots.

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Posted: 18 Apr 2024 at 9:09am

Good observations.

A point I learnt was that when fired, the air pressure from a springers piston builds behind the pellet until the pressure is enough to propel the pellet and parachuting (expanding) the skirt. So if there is a gap around the skirt, pressure will bypass the skirt.

In a pcp, the pressure arrives instantly, parachuting the skirt against the rifling straight away. So a good fitting pellet in a springer is vital.

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Posted: 18 Apr 2024 at 8:43am

Maybe I should be looking at skirts as previous asked.
Found an artical while looking for head sizer.
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The pellet head need only lightly touch the lands, so that the pellet doesn’t tip back and forth on the way down the bore, but the pellet’s skirt must cut into the rifling to effect an air seal.

In springers, the skirt has a very important second function, as James has pointed out. It interacts with the chamfer at the breech end of the barrel. Together with the pellet's weight, this determines the point in the piston’s travel, at which the pellet begins to move. If the skirt is too small, the pellet takes off too soon; power is lost and there is a minor “slam fire” effect on the piston. If the skirt is too big, the pellet will linger too long and the piston will bounce, again wasting velocity and making more felt recoil.

There is a lot of variety out there both in pellet skirt size (I’ve measured anything from .180” on Crosman ammo to almost .190” on some traditional RWS designs), and the breech chamfer detail (many guns today have a short, sharp-edged angled cut, some have a more carefully designed longer taper, some are in between).

IMHO experimenting with different ammo to match up skirt size vs. breech fit, is a really important part of shooting springers. It can have a huge effect on accuracy, consistent velocity, and firing behavior. It’s long been curious to me that pellet weight and head size seem to get the lion’s share of discussion, while this aspect is rather ignored.

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Posted: 17 Apr 2024 at 10:52am

They are not! I've already had one mishap with them, so put some cardboard inside of the joints. Want them movable till I sort out what head sizes and weights do what. Then I'll reorganise the partitions, line the bottom and glue them in.

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Posted: 17 Apr 2024 at 9:29am

U sure have been busy!
I hope those little yellow plastic dividers are glued down to the bottom of that black container!

Walk quietly, but carry a big stick.

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