accuracy expectations
been tuning and modifying what started as an .22 cal escape ss to get the best accuracy at 50yrds. so far the best i’ve achieved is with the current setup as an 18″ tt .25 cal barrel, with a standard valve tank (not the original high flow valve which was too sporadic). shot strings velocity wise look really good (see below shot with polymags).
been testing variety of pellets and groups seem great for a few rounds then get some fliers and/or poi shift.
next up will be to limit frame flex and improved trigger.
question to experts here – i’m trying to achieve consistent, sub .75 inch groups at 50 yards, is that a reasonable expectation or most likely unobtainable?
thanks in advance
shot fps fpe
20 755 32.91
19 756 33
18 754 32.83
17 755 32.91
16 756 33
15 759 33.26
14 752 32.65
13 762 33.53
12 762 33.53
11 766 33.88
10 764 33.7
9 769 34.15
8 770 34.23
7 769 34.15
6 769 34.15
5 768 34.06
4 768 34.06
3 771 34.32
2 775 34.68
1 781 35.22
Average: 764 33.70
StdDev: 8
Min: 752
Max: 781
Spread: 29
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I have a 22 ‘Talondor’ that will consistently do 1″-1 1/2″ groups at 50 yds using a red/green dot sight…should be no problem for you to achieve. :biggrinn:
Which pellets have you ben testing?
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Your desired groupings are NOT unobtainable by any stretch…. However, there are some modifications your going to need to make to your current set up. But before you make the mods, what is your goal? Do you want accuracy, long range, or stopping power? The reason I ask is because everything has it caveat. I’m going to give you what I know, and you can run with that.
#1- If you’re shooting .25 pellets, you’re shooting them WAYYYYY too slow. If you have a chronograph, then adjust your power wheel to achieve and average of around the 950 fps mark. You’re shooting your pellets too slow for them to properly stabilize. At 50 yards, no big deal. But shooting them farther than 50 yards, you will notice massive inaccuracy issues. If the pellets are unstable, you will notice wild spinners. Pumping up the velocity will improve accuracy on .25 pellets. Every caliber seems to have it’s sweet spot. .177 caliber likes the 1050 to 1100 range. .22 caliber likes the 900 fps range. And .25 seems to like the the 950 fps range. That being said, let’s go to the next item. Pellet choice.
#2- Pellet choice. This is HUGE. I prefer JSB domed pellets in 33.95gr. There’s a very significant reason I like these pellets. They are hands down the most stable pellets in flight when pushed to the proper velocity. I have found that the weight and aerodynamic design of these pellets minimizes and in some cases eradicates multiple zero points. What do i mean by this? Lets me explain.
A firearm has 1 zero point. Whatever distance you zero your scope on a rimfire or centerfire rifle, the projectile will ONLY drop from beyond that zero point. If you sight your scope in at 30 yards on a firearm, anything beyond that 30 yard mark the bullet travels in a straight line, then gravity and physics take over and it begins to lose velocity and drops off.
Pellets will lose velocity and drop off, however, in the case of most pellets the pellets will rise as they leave the muzzle, stabilize in flight, then follow the natural laws of gravity and physics and drop off again. So if you zero your gun in at 50 yards, you might have a second zero at 20 yards. Then at 30 yards you will have to hold under. Same with 40 yards. 50 yards equals second zero point. Then at 60 yards and beyond you will have to start holding over with your mil dots.
However, I have noticed the shape and weight of the JSB 33.94 gr pellets seem to eliminate this from happening. I have my rifle zeroed in at 50 yards. I get dime sized groups with CONSISTENCY at this range. At 25 to 50 yards, I have the exact same zero point. Then beyond that the pellets begin to drop off. But the 33.95gr pellets seem to be the most stable in flight. However, here comes the caveat- they are much heavier, so your long range shots diminish. My gun is a modified (regulated) condor with a 24″ heavy duty barrel. I’m getting 940 fps at the muzzle with 50 FPE. My gin is zeroed at 50 yards. At 100 yards I’m holding over by 3 mil dots. But I get no fliers because the velocity and design/weight of the pellets compensate for instability issues. They also have MASSIVE knock down power. You can take out anything from coyotes down in size.
So in my opinion, you need to push your pellets faster, AND make sure your using a good quality pellet.
Keep us filled in with results.