ST vs LW in 35km windy conditions

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mubhaur

mubhaur

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Nov 8, 2015
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Karachi, Pakistan
For the first time I compared FX royale 400 .22 regulated in 35km cross wind gusts at 50 yards using jsb 18 grain. I started from 930 fps and gradually reduced the fps to 860 fps. The group was around 2.5". 

Then I tested LW barrel at 860 fps using same pellets and same distance. Now the group size was 1.5".

Any one will share one''s own experience in this respect?
 
Sorry I am no expert at paper punching. Was this test done on the same gun but with a barrel swap or two different guns? How many shots were in your groups to get your readings? How many sets of groups did you do to make it a fair comparison? I don't think you can compare realistically. for a few reasons. First being the wind "Gusts" are not constant and will always change your groups. Also you said you tested the LW barrel at 860 fps. Did you change the regulator or did that start out at 930 and go down to 860 like the ST barrel? Also were both barrels cleaned before shooting? Sorry so many questions. Just hard without all the info. Or maybe it is just a better barrel. How does it compare on a windless day? 
 
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Same day, same gun, replaced barrels, for both started from around 930fps and came down to 860 fps, 6 groups of 10 shots with each barrel. Wind gusts were there which was not controllable thing but apparently gusts were of the nature. Same regulator setting. Same box of pellets. All those factors were identical which could be made identical. 

I am also surprised to experience it.
 
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Ok then it looks like you did your part to make it as even as you can. I would be interested to hear how the barrels compare on a windless day. I was wondering if the barrels have the same rifling (twist ratio)Your stock rifle has a FX smooth twist match grade free floating barrel. I wonder what your LW barrel has? Also I remember reading somewhere when someone had a accuracy issue too. They discovered the "free floating" barrel was actually hitting the air cylinder or the LDC was. They either moved the LDC forward just a bit and maybe put a small rubber o-ring between the barrel and air cylinder to keep the spacing consistent.
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 Good luck. It is a beautiful rifle.
 
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Thanks, great comparison of , your, barrels/rifle.
I too agree, if the LW & ST group the same w/no wind but the LW does better in poor conditions, I certainly would run that one.

Now I do NOT know the ST barrels, I have had a mess of LW barrels ( & some others).

A barrel is not a barrel just because it is a barrel, okay it is but they are NOT all equal.

Example, in 2006 if you ( I did ) purchased 12 full length LW 15mm .22 barrels more than 2 would be BAD. Swithed to the 16mm and they almost all shot well, as we expect from LW these days.

I would wager some ST barrels are somewhat better than others.

Doesn't matter but were both as delivered or perhaps polished a bit?

I tried this ( different barrel with no setting changes ) when the B51 first came out, good clean fun.

John
 
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"18.13"The LW barrel will have a higher BC than the ST barrel. If you look up some of Yrrah's post he explains this somewhere.
Click to expand...
Since when is BC barrel rather than projectile dependent?

Ballistic Coefficient (BC) is basically a measure of how streamlined a bullet is; that is, how well it cuts through the air. Mathematically, it is the ratio of a bullet's sectional density to its coefficient of form. Ballistic Coefficient is essentially a measure of air drag

Thurmond
 
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"T3PRanch"
"18.13"The LW barrel will have a higher BC than the ST barrel. If you look up some of Yrrah's post he explains this somewhere.
Click to expand...
Since when is BC barrel rather than projectile dependent?

Ballistic Coefficient (BC) is basically a measure of how streamlined a bullet is; that is, how well it cuts through the air. Mathematically, it is the ratio of a bullet's sectional density to its coefficient of form. Ballistic Coefficient is essentially a measure of air drag

Thurmond
Click to expand...
It is barrel dependent, Harry did some tests comparing a ST barrel to a BSA barrel.
The pellet shot from the BSA barrel had a higher BC than the one shot from the ST barrel.
A BC specified by a mfr is only a guideline, but it can be different depending on what barrel someone is using. That's nothing new ☺
I did the same test with an ST barrel and a CZ, and the CZ did also better in windy conditions. Indoors, they were about equally accurate. The CZ however had less fliers overall, and is less pellet fuzzy.

 
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