Would anyone of you that understand about coeficients could tell me please which of these two options in. 25 Cal would in theory be better in terms of efficiency against wind?
Thanks.
Thanks.
JSB 25.4 grain at 911 fps or JSB 34 grain at 820 fps?
- Thread starter Emu
- Start date
100% the 34gr JSBs have the theoretical (and very likely practical) advantage in the wind.
I have roughly the same velocity profile out of my AA S510 and the 34gr pellets vastly outperform the 25.4gr Kings
I have roughly the same velocity profile out of my AA S510 and the 34gr pellets vastly outperform the 25.4gr Kings
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My Maverick is tuned 34 grainers at 938fps with ES of 7.0 and STD Dev of 2.1 and does way better at 50 and 100 in stiff breezes than the same rifle with 25 grainers. I retuned for the 34 grainers because of this.
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I’m guessing the speed you’ve posted is the first measured velocity?
In order to accurately answer your question and determine BC, a velocity measured further down range will have to be known.
Example: MV @ 25 yards & MV @ 50 yards.
In order to accurately answer your question and determine BC, a velocity measured further down range will have to be known.
Example: MV @ 25 yards & MV @ 50 yards.
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I only have meassured my rifles as close as possible to the barrel.... The speeds I am talking about are with the same rifle at the end of the barrel first with the 25.4 grain and the next shot with the 34 grain pellet. I am no so experience in how to measure ballistics.
I know that a rifle could like more one pellet than the other. But if both pellets have acceptable accuracy with out wind, it is important to know wich of those pellets would work better on real world conditions for hunting purposes.
Thanks again to all.
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Once decided the 34 grain are going to be the choice, I just move a little bit the hammer in order to get some more fps...
Tomorrow I will measure how many fps more it gives with the adjustment.
Some more fps will give a little flater and better parabole. Also will help for shooting at long range.
Tomorrow I will measure how many fps more it gives with the adjustment.
Some more fps will give a little flater and better parabole. Also will help for shooting at long range.
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@Emu I don’t calculate BCs or dial turrets. I just shoot, monitor velocity, change hammer spring and reg settings until I find a desirable shot string stats. I shoot 34 grain pellets 50-100 yards from a .25 Brocock Bantam Sniper HR in the mid-800s. They handle the wind well in my experience. I shoot from a tripod and I’m not much of a precision shooter. They group ok for my abilities.
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I am in the same team of shooters !
I learn how to compensate with the reticle in stead of moving up or down the turrets. According to my experience there's always a delay in the adjustment of turrets and not an exact return to origin point, so I am more confident just learning how to compensate an leaving the reticle rest were I know it is
dully zeroed.
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Yes. I weigh the pellets into groups of similar weights, then run each pellet through a PelletGage for head size. My guns aren't too sensitive to which head size, but by keeping them in batches of same head size helps prevent fliers to a degree. This is why I can get such small groups. I used to do the same with powder burner bullets as well.
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I do not sort pellets.
I just made this group with my Evanix Windy City (non regulated) that has an FX ST barrel. JSB 34 grain .25 Cal.
There are 5 shots at 70 yards. For someone of my age and condition I don’t see it too bad:
Accurate enough for hunting purposes…
Tomorrow I will try another group early in the morning in order to shoot without wind.
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Rsfrid, a moment ago I tried to shoot at one of your targets. It is just imposible for me to focus on them. I just do not see correctly.
With my targets I see where to aim.
Print some of my targets and you will make much better groups. It is much easier!!
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I'll probably switch my Avenger to FX or JSB 33.95s but it is currently shooting FX 25.4s at 930 fps. Short range accuracy is very good but the little bit I have shot at longer range has not been good. I need to shoot it more at 50 to 100 yards to be sure.
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I do !!! …..
At my targets I can see the tips of the crosses as a target and also the center at 100 yards.
The official targets like yours are for me impossible to know where to aim.
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Then use yours. I don't see the problem. Use what works for you. I use a 40x Athlon scope and it works fine for me.
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