Fac air - 15grn vs 21grn

[Salop Matt]

I have 1000 bisley mags(21grn) to use through my Rapid mk 1 (30fpe) but after that I am considering changing the ammo choice to JSB`s which are lighter at 15GRN provided they group okay.

 

My question though will I see any difference in the quallity of my kills with the lighter pellet over the heavy ?

[Dekers]

I have 1000 bisley mags(21grn) to use through my Rapid mk 1 (30fpe) but after that I am considering changing the ammo choice to JSB`s which are lighter at 15GRN provided they group okay.

 

My question though will I see any difference in the quallity of my kills with the lighter pellet over the heavy ?

 

 

At 30ft lb you are right on the line between the AA/JSB 15.5-16.4g and the Bisley Magnum at 21.4 in my opinion.

 

Both are excellent pellets an both suit my Falcon barrel at 26ft lb. Kills, I find there is next to nothing in it but the lighter pellets are going that bit faster which makes the shot a bit easier, at 26 ft lb and 21.4g for the Bisley I think they are still a bit heavy, at 30ft lb PLUS I think the Bisley are excellent.

 

SO...at 30 ft lb you are right on the line...?!

 

Be careful with the size...AA/JSB make 5.51 and 5.52 pellets, mine definately prefers the 5.51

[pabs]

The heavier JSBs 18grain at 30 ftlb will be doing around 930 fps. You will need to put at least 50 or so through the barrel before you see a difference. Then you WILL see a difference.

Bis Mags are good, but the JSBs will poo all over them.

My LW barrel prefers the 5.52, engages the rifling much better.

Edited September 27, 2010 by pabs

[John_R]

The only way to find out is to try them, also the 18 grain JSB exact/ Defiant would be worth testing. The Bis Mags are better in the wind, at least they are in my experience.

[sitsinhedges]

Use the lightest most accurate pellet, accuracy aside there is no benefit from using a heavy pellet in any given air rifle calibre unless you like loopy trajectories

[Salop Matt]

I have a requirement to shoot crows on an airfeild and its numbers that I need, not eating meat so I am guessing that I wll be wanting to go for the upper chest (heart area) so was hoping with the 21grn`s It will smash through the chest bone and do the job. But would be concerned that the lighter pellet wouldnt do the job !

[pegasus bridge]

I have a requirement to shoot crows on an airfeild and its numbers that I need, not eating meat so I am guessing that I wll be wanting to go for the upper chest (heart area) so was hoping with the 21grn`s It will smash through the chest bone and do the job. But would be concerned that the lighter pellet wouldnt do the job !

 

here is my tuppence worth - i would think 30fpe would have no problem punching through a crow ; i'm running FAC air at 40fpe, and shot a pigeon side on at just under 50 mtrs - pellet passed straight through (it dropped like a brick), i shot a magpie at 50+mtrs, again it passed straight through. i have only tried bisley mags (which i am very happy with) - and some old eley wasps that i had knocking around- which i suspect were being blown apart as they grouped like a shotgun at 40 mtrs.

[kent]

I have a requirement to shoot crows on an airfeild and its numbers that I need, not eating meat so I am guessing that I wll be wanting to go for the upper chest (heart area) so was hoping with the 21grn`s It will smash through the chest bone and do the job. But would be concerned that the lighter pellet wouldnt do the job !

 

Straight on chest shots and them crows will fly (often a long, long way) Pellets won't answer this as same will occur with .22lr and even 17hmr. You need to work on placement, no i don't mean just head shots! Shoot them along the length of the body when they dip and call and between were you would imagine the shoulder blades would be if birds had them, there are other shots that work but these two are very easy to descibe. The vitals are lower down than many imagine, cut one open and examine it and you will find out more about placement than i can descibe to you here

[Salop Matt]

Will stick to head shots for now then and do some postmortem work as Iv never cut a bird open before, only taken breast meat !

 

Cheers

[kyska]

Salop, do you know how old your rapid is? I also use a mk1, old enough to have the anschutz barrel which can be a bit picky on ammo, I have 32ft/lb and have stuck to the JSB 15.9g and have no problems with grouping or killing. Nice flat trajectory.

[Salop Matt]

1996 I belive !

[kyska]

1996 I belive !

 

I think that will have the same barrel then mate. I'd give the jsb a go, and some AA field extras. I have plenty of both if you want me to post you 50 or so of each to try?

 

Kyska

[Salop Matt]

Kyska - that would be excellent if you could and very much appreciated ! I will PM you my address. Once again thankyou very much .

[Dekers]

I have a requirement to shoot crows on an airfeild and its numbers that I need, not eating meat so I am guessing that I wll be wanting to go for the upper chest (heart area) so was hoping with the 21grn`s It will smash through the chest bone and do the job. But would be concerned that the lighter pellet wouldnt do the job !

 

 

 

 

They are both 30ft lb from an air rifle, the lighter pellet is going faster to achieve this and at any distance up to the sensible usable range of a 30ft lb air rifle they will still be carrying a similar amount of energy.

 

The lighter pellet will have as much, if not more, chance of penetrating, than the heavier as it will have more shock effect due to speed, perhaps resulting in over/through penetration and therefore wasting energy. The heavier pellet may deliver more of its energy by staying in the quarry more often.

 

This is all relative of course, and we are still talking very low levels of energy in the great scheme of things!

 

ATB!

[Salop Matt]

I think that will have the same barrel then mate. I'd give the jsb a go, and some AA field extras. I have plenty of both if you want me to post you 50 or so of each to try?

 

Kyska

 

 

Many thanks Rich, I was astonished to see them arrive at lunch time ! I havent oppened the pack yet but I could tell what it was as soon as I saw and felt the pack ! And a good job by Royal Mail also.

 

Fingers crossed I am getting my buddy bottle fill pressure sorted this weekend and if that works out well then I will just be relighent on getting my scope sorted the following saturday ( I bought a MTC 3-9x50 cobra which is to big for my mounts so fowls on the barrel! Going to drop to the 3-9x44). Wich is when I will be able to test these little beautys as then that evening I have a rabbit cull to do which last time was a bag of 51 bunnys !

[nemo1966]

The heavier JSBs 18grain at 30 ftlb will be doing around 930 fps.

 

18gr @ 867fps = 30.05fpe

 

I think you are referring to 16gr @ 930fps = 30.73fpe

Edited October 1, 2010 by nemo1966

[pabs]

Doh!

[21grains]

21.1gr. Barras over 30flb are the way to go for hunting. I shoot them at 840fps @ 33flb sight for40yrds from 8-50yrds never more than 1/2" high or low. 30 shots with no poi shift. over 900fps less shots @ 38flb max around 20 shots, not enough for walk in woods. Benjamin Marauder PCP .22 The .25 starts at 45flb My next Gun.....Franky

Edited October 29, 2010 by 21grains

[Salop Matt]

21GRNS, I am currently planning on using 21grn bisly magnums for 40 - 50 Shots !

I am using a un-regged mk1 rapid 19" barrell and filling to 220 bar / 3200psi and its purformance is like this:

 

1st shot - 791fps (29.17fpe)

10th shot - 793fps (29.33fpe)

15th shot - 799fps (29.77fpe)

20th shot - 806fps (30.30fpe)

25th shot - 809fps (30.52fpe)

30th shot - 813fps (30.82fpe) (most powerful)

35th shot - 807fps (30.37fpe)

40th shot - 806fps (30.30fpe)

45th shot - 797fps (29.62fpe)

50th shot - 793fps (29.33fpe)

 

 

Will see how I get on, I have 1000 mags so will see what i recon and then i will try 1000 16grns of something ! :blink:

[kent]

21GRNS, I am currently planning on using 21grn bisly magnums for 40 - 50 Shots !

I am using a un-regged mk1 rapid 19" barrell and filling to 220 bar / 3200psi and its purformance is like this:

 

1st shot - 791fps (29.17fpe)

10th shot - 793fps (29.33fpe)

15th shot - 799fps (29.77fpe)

20th shot - 806fps (30.30fpe)

25th shot - 809fps (30.52fpe)

30th shot - 813fps (30.82fpe) (most powerful)

35th shot - 807fps (30.37fpe)

40th shot - 806fps (30.30fpe)

45th shot - 797fps (29.62fpe)

50th shot - 793fps (29.33fpe)

 

 

Will see how I get on, I have 1000 mags so will see what i recon and then i will try 1000 16grns of something ! :look:

 

I wonder if a slightly lower fill pressure might get you adequate shots and a slightly flatter curve? I use the same gun same ammo and get slightly less variation over 50 shots going to slightly less pressure (don't go too low i tried 200 and it was pathetic). I also run just slightly lower on the velocity though not by much at all

[Salop Matt]

Kent exactly what fill pressure are you using ?

[21grains]

Sniper; That's a lot of shots, how many cc of air doe's Gun hold. Is it a bottle? Mine is 215cc, sent for tube extension 77 1/2 cc should get 25% more shots per. add. $95 posted. Try 3000psi start to flaten out string,You'l still get plenty of shots thier. Best of luck Sniper.....Franky

[Salop Matt]

400cc on a rapid buddy bottle !