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PostPosted: Tue Jan 05, 2010 6:46 pm 
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1) Are heavier pellets (18 - 25g) generally more accurate than lighter (13 - 15g) ? Lets try and restrict this to 0.22 cal. only and a maximum of 50 yds, outside in the elements. Lets also assume the same style.

2) I have a gun that will shoot a 14.5g pellet at aprox. 700+ fps so if I use a 21.1 g H&N Barracuda (just an example) I would guess this will drop to around 500 fps. So which pellet would be more accurate ? Same restrictions.


Thanks for looking.
Jeff.

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PostPosted: Tue Jan 05, 2010 7:04 pm 
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Dont tell my wife wrote:
1) Are heavier pellets (18 - 25g) generally more accurate than lighter (13 - 15g) ?

I don't think so. I've seen light pellets being pushed around the 1,000fps mark that tend to become less stable as they approach supersonic. A heavier pellet out of the same gun will slow things down and then shoot more accurately...but the same light pellet shooting slower because the gun has been detuned will sometimes do the same thing. In short, I find a rifle will like what it likes regardless of weight.

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PostPosted: Tue Jan 05, 2010 7:18 pm 
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Location: 'round the corner from "the museum"
Yes and no.

Assuming your gun likes both pellets equally well then accuracy should be similar at all ranges.
However two variables will make one or the other a better choice.
1) If you are shooting at unknown ranges then generally the faster pellets will be easiest to make hits with as the range estimation will be less critical. This is somewhat dependant on the BC of the individual pellet but so long as one or the other isn't a wadcutter it should be pretty apples to apples.
2) If it's windy then the heavier pellets should be less affected. Again unless the lighter pellet is one with a very good BC compared to the heavy then it will most likely be blown around more at range.

Pellet choice is important. But so long as your gun is not shooting faster than 950 your best bet is to find the pellet with the best combination of velocity and BC that shoots accurately from your set-up.

-Grant


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PostPosted: Tue Jan 05, 2010 9:40 pm 
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grantmac wrote:
But so long as your gun is not shooting faster than 950


Not much chance of that.

Are there any regulations that say you have to use the same pellet for the entire round ? I realize it is not a good idea to switch but can you ?

Thanks.
Jeff.

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PostPosted: Tue Jan 05, 2010 10:02 pm 
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I don't think there is any regulation about switching pellets in FT, as long as your gun is under 20 FPE in any configuration you shoot it....

There are two primary reasons that heavy (ie over 10 gr.) .177 pellets are popular in FT....

1. When you are near the 20 FPE limit, lighter pellets will be travelling too fast.... in the transonic (or supersonic) region.... and therefore have worse accuracy (and ballistics)....

2. Heavy round-nose pellets will usually have a better Ballistics Coefficient (BC) than lighter ones.... giving a flatter trajectory....

People shooting in the 12 FPE (International) Class will typically use medium weight pellets such as the JSB Exact 8.4 gr.... or even standard weight pellets (7.9 gr).... because you have the opposite problem.... you need the velocity of the lighter pellets to get a flatter trajectory.... The same applies if you are shooting a .22 cal in FT.... You will probably use a standard weight pellet to get the flatter trajectory....

For reference:

20 FPE ~ 920 fps with a 10.6 gr. pellet.... or 790 fps with a 14.3 gr. (.22) pellet
12 FPE ~ 800 fps with an 8.4 gr. pellet.... or 825 fps with a 7.9 gr. pellet

Whatever setup you are using, try and stick with true round-nose pellets (JSB Exact, Crosman Premier, H&N Baracuda/Beeman Kodiak) or similar to get the best possible BC.... over 0.030 is preferred.... :wink:

Bob

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PostPosted: Wed Jan 06, 2010 9:57 am 
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Thanks Bob. I still have to get out and try for my self, and practice, practice, practice.

Jeff.

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