Trajectory Target

[CraigH]

I bought a book some time back titled "Gun Digest Book of the .22 Rifle" (published 2009) by C. Rodney James.  There is a lot of good information some of which is useful for air guns too.

There is, for example, mention of cracks or splits on projectile bases affecting accuracy which relates to a recent post by arkmaker on a flyer caused by a chip on a pellet skirt.

I found the subject of trajectory targeting interesting - using just one target with multiple bullseyes shot at multiple distances.  It gives an excellent graphic representation.

[Redleg]

I have trouble remembering differences between some of my air guns and I have some 50 foot small bore rifle targets (Bushnell) that I can use for this and keep on hand for reference.

Also it seems that this would be a good way to record differences according to number of pumps!

[oldgearhead]

I like the free software from Hawke, Chair Gun Pro:

1377 example:

[CraigH]

I also like the fact that group sizes are seen on the trajectory target.  Something of a real life snapshot.

[arkmaker †]

Prurley an opinion, but weight has a lot to do with groupings. I found that when I shoot my 1740 using 10.34 grain vs 7.3 grain, that I need to aim a bit lower with the heavier pellet at 10 meters. Seems like it would be opposite, but I have tested it out multiple times....

Hmmm, that may or may not relate to firearms and the discussion at hand 

[quickster47 †]

Prurley an opinion, but weight has a lot to do with groupings. I found that when I shoot my 1740 using 10.34 grain vs 7.3 grain, that I need to aim a bit lower with the heavier pellet at 10 meters. Seems like it would be opposite, but I have tested it out multiple times....

Hmmm, that may or may not relate to firearms and the discussion at hand 

I do believe the thread is really about airguns and pellets.

Carl

[Rualert]

Prurley an opinion, but weight has a lot to do with groupings. I found that when I shoot my 1740 using 10.34 grain vs 7.3 grain, that I need to aim a bit lower with the heavier pellet at 10 meters. Seems like it would be opposite, but I have tested it out multiple times....

Hmmm, that may or may not relate to firearms and the discussion at hand 

     I know this discussion is mainly air guns and pellets, but what you describe is also directly related to powder burners too. For instance I have seen the exact same thing with my PB's from 22 cal up. If you are zeroed at say 25 or 50 yards at a shorter distance you typically do have to aim a little lower to get the correct POI. You can really see it with our air guns, another example my M-rod is zeroed at 25 yards most of the time, and if I shoot it at 10-15 it hits low. This is really noticeable with the Talon that I keep zeroed at 50 and 100 yards.

Casey