Please see what this man says in Minute 15:30:
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N/A Important !! Please Air Rifle makers, look at this. Important for accuracy.
- Thread starter Emu
- Start date
This is so widely known in powder-burner circles that I'm astonished that it doesn't come up more often. Very cool that this rifle is adjustable since there's no one correct depth - it varies with the vagaries of the rifle and barrel.
GST
GST
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Yes I find the same.
The question for each individual shooter is does it really matter for your specific purpose.
For me the answer is seldom. Mine are all accurate enough for me, which is better than I am capable of shooting.
The question for each individual shooter is does it really matter for your specific purpose.
For me the answer is seldom. Mine are all accurate enough for me, which is better than I am capable of shooting.
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I believe that too. Seems important to seat the projectile solid and past the transfer port.
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A good friend and talented smith and machinest took a lot of time to make me a very custom, concentric, pellet pusher that mounts on the cocking housing of my Piatt - Thomas .177 Bench Rest rifle. The depth of pellet set in the breech can be adjusted.
Pellet skirt flush with the breech face gave me the widest 5 shot pellet dispersion. I then slowly adjusted the depth of the pellet until the dispersion for 5 shots was one jagged hole.
Because the probe has to be concentric with the center of the bore so as not to deform the pellet, and the probe diameter has to be such that it will fit within the skirt and not deform it, it took my friend a long time to produce this pellet pusher. So long that he refuses to build another.
Pellet skirt flush with the breech face gave me the widest 5 shot pellet dispersion. I then slowly adjusted the depth of the pellet until the dispersion for 5 shots was one jagged hole.
Because the probe has to be concentric with the center of the bore so as not to deform the pellet, and the probe diameter has to be such that it will fit within the skirt and not deform it, it took my friend a long time to produce this pellet pusher. So long that he refuses to build another.
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I prefer probes that push the pellet from the skirt provided the pellet doesn't require too much force to seat, that way the seating depth isn't that important going from one pellet to the next, as they will all seat equally. Just my preference. I noticed long ago with pin style probes that some pellet skirts were still exposed in the transfer port after seating full depth.
-Matt
-Matt
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Mike has his own pellet seater that he attaches to his rifle if requested. I have made my own simple hand held seater for my RAW rifles it is a simple T handle that I can push the pellet into the lead to engage the rifling at what ever depth I want after the probe has initially seated squarely. Honey didn’t see much of a difference?
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I would imagine its like firearms seating depth. Some are very picky and some see a smaller impact on accuracy. Did you see anything else using something to seat the pellet deeper than the probe? FPS stay the same? Seating deeper than the probe creates a larger expansion area before the projectile. I dont know if that would cause a negative, positive effect or no effect.
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I was only looking at this for strictly accuracy improvements with different pellet lots thinking I could get poorer shooting pellets on par with my best shooting lots. Didn’t really see much of any definitive results.
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Probably not favorable or unfavorable enough effect for the average shooter, but for the 100yard + ebr style shooter, probably.
-Matt
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For my .177 Piatt - Thomas to produce five 5 shot groups each of less than 0.209" (1MOA) edge to edge at 20 yards indoors, all the following has to be consistent:
Bench vibration
Rest vibration
Gun & barrel vibration
Plenum air pressure
Trigger, hammer, & valve response
Rifle temperature
Pellet weight, size, shape, & eccentricity
Pellet insertion depth in chamber
Pellet speed.
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