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List of pellet head/skirt dimensions?

January 4 2018 at 3:30 PM
gasbag  (Login gasbag)
YF

Would anyone know where I can find a listing of head and skirt dimensions for various .22 pellets? I need some .22 pellets that are particularly narrow, as the feeding mechanism in my vintage gas pistol is a casting that is known to break under pressure. The loading trough does not permit the use of a pellet probe to start the pellets into the rifling. I have to rely on the bolt probe and it's a somewhat delicate design. Thanks.

 
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Jason
(Login nervoustrigger)
YF12

Not the answer you want, but...

January 4 2018, 4:55 PM 

...probably the answer you need happy.gif

For your particular concern, I suggest the JSB RS 13.4gr for several reasons:

1. The heads of JSB pellets seldom measure larger than 5.51mm.
2. JSB uses soft lead.
3. Skirts are always a few thousandths larger than the heads, and the thin skirt of the 13.4gr pellets combined with the soft lead will ease chambering.
4. It’s a lightweight pellet which is usually desirable for the low velocity of pistols.
5. JSB makes the best pellets in the business.

Regarding a table which has dimensions of various pellets, I am not aware of any such resource. You will find variations from batch to batch amongst every brand and type of pellet so even if there were such a thing, the numbers would have to expressed as a range and would only be valid for the particular batch on hand at the time.

 
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gasbag
(Login gasbag)
YF

Will place order for them, Jason. TX NT

January 4 2018, 6:48 PM 


 
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Skillet
(Login Skillet)
YC

From what I've read...

January 4 2018, 5:29 PM 

Crosman pellets, points/domes/WCs run to the smaller dimensions (heads and skirts).

The reference is "American Air Rifles" James House, pg 55. Older reference, and manufacturing tolerances can always change. For what it's worth

 
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Jason
(Login nervoustrigger)
YF12

That’s a good example of what I was referring to.

January 4 2018, 5:44 PM 

Because I’ve kept records of measured head sizes since 2012 and Crosman pellets (mostly CPHP and CPUM in .177 and .22 cal) have trended large in recent years. A lot of variability and frequently out-of-round but trending large on average. Pretty common to see 4.52 – 4.55mm in .177 cal, and 5.52 – 5.56mm in .22 cal, taking care not to measure across the mold parting line.

 
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gasbag
(Login gasbag)
YF

I'll try them, Skillet. TX.. NT

January 4 2018, 6:58 PM 


 
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Doug Wall
(Login DougWall)
YF

That list doesn't exist.

January 4 2018, 5:46 PM 

Hard Air Magazine has done some evaluations on a few pellets, and quite often we see head sizes off a bit from manufacturers claims. There is also a distribution of head sizes, larger on some types of pellets than others. We haven't even attempted to measure skirt sizes, because they always get swaged down when chambering. If you're worried about skirt sizes, you could always make up, or have made, a sizing die.

 
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gasbag
(Login gasbag)
YF

Good suggestion. TX Doug. NT

January 4 2018, 6:56 PM 


 
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Jeff M
(Login jmars)
AR&P

Make and model of the vintage gas pistol could be useful. nt

January 4 2018, 8:59 PM 

nt

 
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gasbag
(Login gasbag)
YF

Schimel GP22 NT

January 5 2018, 10:21 AM 


 
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Doug Shea
(Login DJSHEA)
YF12

Straight Shooters...

January 4 2018, 9:58 PM 

has a chart with all the info you are looking for , it has been around for a very long time. Doug

 
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Doug Wall
(Login DougWall)
YF

I would challenge the validity of that list

January 5 2018, 8:09 AM 

I suspect that theses are based on measurements of one pellet. There is enough variability in pellet manufacturing that it's not really valid to do that. A statistical analysis is necessary for any kind of comparison. Ten pellets of each would probably be the minimum required for any kind of comparison. Also, what are their measurement methods, or are they just accepting manufacturer's data?

 
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Jason
(Login nervoustrigger)
YF12

I agree with Doug Wall 100%

January 5 2018, 9:36 AM 

as described in my original reply.


    
This message has been edited by nervoustrigger on Jan 5, 2018 12:06 PM


 
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gasbag
(Login gasbag)
YF

Thanks, Doug. Just what I need. NT

January 5 2018, 10:24 AM 


 
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nced
(Login SpringerEd)
YF12

Not .22 but after measuring .177 JSB Exact and H&N FTT pellet heads............

January 5 2018, 12:29 PM 

I wonder why they sold different head sizes. Some pellets from the tins marked 4.50mm were larger than pellets marked 4.52mm and visa-versa.
5vGMBDxh.jpg
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I really can't image why .22 pellets would be different but the larger diameter may make pellet fit in the leade less critical.

The H&N FTTs weren't any better with a max head size variation of .005 INCH.......
f1F71oPh.jpg

I found that while the Crosman Premiers from the 1250 count box had large heads, they were much more consistent in head size averaging 4.53mm to 4.55mm........
qbrnYqjh.jpg
Because of this I made up a pellet sizer that would reduce the pellet head to about 4.50mm for use with my tight leade HW95 and found that the resized CPLs also worked fine with my looser leade R9.........
p2Nqal1h.jpg
mm8jrFch.jpg
Actually, I made up a couple different dies, (4.48mm heads which works really well for the tight leade HW95 and 4.50mm die for the R9).....
Since then I bought a new .177 HW95 barrel and when inspecting the bore I noticed that it also had a tighter leade than the R9 so I replaced the "larger leade" R9 barrel with the new HW95 barrel so I only have one size of pellet heads to keep track of.

I tghink that as long as the pellet head and skirt are large enough to be "swaged a bit" when pushing into the leade, a couple 1/100ths of a mm doesn't make much difference. The issue is when a pellet is loose fitting in the leade that pellet head size becomes an issue. Even with the Exact tins labelled 4.52mm, most were smaller than listed and fit very loosely in the "large-ish" R9 leade. Matter of fact, when shooting a field target match I had two "dry fires" and would have had a third if I didn't see the loose pellet flip out of the leade when relatching the barrel.

Unless you want to do a lot of tedious pellet sorting, IMHO, simply find an accurate pellet that fits the leade consistently and ignore the "sizes on the label". I do have to mention however that the tin of 4.52mm labeled Air Arms domes I measured was much more consistent than the JSB Exact and there were a lot of 4.52mm AA domes that actually measured 4.52mm unlike the Exacts that most 4.52mm pellets were smaller.

Anywhoo.....my home sized CPLs shoot pretty good for me........
8SZm6IEl.jpg
v6Ug0yHl.jpg
Same gun, different head size....
eIKiookl.jpg

They even worked well for a HW98 after I did some work on it........
BBk4dd7l.jpg


    
This message has been edited by SpringerEd on Jan 5, 2018 12:32 PM


 
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gasbag
(Login gasbag)
YF

Wow. Thanks for all the great info! NT.

January 5 2018, 5:12 PM 


 
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21grains
(Login 21grains)
YC

Here You go

January 5 2018, 3:33 PM 

https://airenlaces.blogspot.com/2012/10/medidas-de-balines-y-diabolos.html

Scroll down to Pellet Pix. & Mesurements.....Franky

 
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Doug Wall
(Login DougWall)
YF

Same issue- No statistics nt.

January 5 2018, 3:40 PM 


 
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gasbag
(Login gasbag)
YF

Excellent, Franky. TX! NT

January 5 2018, 5:09 PM 


 
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