TargetTalk

Hoping someone here knows what I'm talking about - the NSRA didn't...

I have seen a target which was scaled to the 10m international air rifle target ring sizes, but for use at 6 yards. So the rings were very close together and it was outward rather than inward gauging.

I have only seen one, and the person who showed it to me had picked it up and didn't know where it came from. It was physically about 4 inches square and was printed on target board, i.e. not just run off on a computer printer. It had the standard 5 blacks in a domino pattern.

Does anyone know who sells these? They don't have to be official and approved for matches, it's only for training.

I took a regulation target and reduced it 40% on a photo-copier, then copied that onto card stock paper. Great for practice, not quite good enough for accurate scoring.

Jeff

they are on this page

http://www.nsra.co.uk/Shop2/Shop_html/airgun.htm

Not unless I'm going nuts. I see standard 6 yard targets, and 10m scaled from 50m. I need 6 yards scaled from 10m.

skylark wrote:Not unless I'm going nuts. I see standard 6 yard targets, and 10m scaled from 50m. I need 6 yards scaled from 10m.

You're right the NSRA don't do anything that meets your description - that I've ever seen. You could try a target maker like Kruger as they do a lot of targets. Or maybe just forget the score element. Get a target scaled down for size (scatt software does that - at whatever distance you want). That way you'll get the same sight picture which is more important for training (IMHO).

Rob.

Here are a 10m air rifle targets scaled for 5m and 7m. This is not exact 6 yards (5,49m), but you can use the SCATT Software Extras for printing targets of any scale.

We had a discussion in our German shooting forum http://meisterschuetzen.net about scaling targets for dry-training.


Best Regards from Germany

FrankD

I needed some 50ft targets that were the equivalent of 50m rifle targets and spent considerable time figuring out the right way to do it. I eventually realized that there were two different adjustments that needs to be made: the resizing of the black sighting bull, and the resizing of the scoring rings. The scaling factors for these two components are not the same, which is why FrankD’s downloadable targets don’t look right to me.

For the sighting bull, there’s an easy ratio that applies. At the standard target distance, there’s a long narrow triangle formed from the shooter’s eye, the centre of the target, and a point on the edge of the black sighting bull. Since light travels in a straight line, a target at 2/3rds of the regulation distance will need to have a sighting bull 2/3rds the size of a standard target. A 6m air rifle target will have a sighting bull with a diameter of 30.5mm (section 6.3.2.6 of the ISSF rules) times 6m over 10m which is 18.3mm.

For the scoring rings, it’s a more complicated story. At normal distances, the 10 ring, even an outside scoring 10 ring, is much smaller than the black sighting bull. Consider, however, the extreme case of a target positioned just in front of the muzzle. The sighting bull in this situation will be a small dot (see above). It’s obviously impossible, however, to shoot a group smaller than the diameter of a bullet/pellet and, as a result, an outside scoring 10 ring in this scenario will inevitably be larger than the sighting bull. It turns out that you need to consider both (a) the distance to the target, and (b) the diameter of the bullet/pellet (a fixed amount that doesn’t change when the distance to the target changes) when resizing scoring rings.

The correct way to scale inside scoring rings is to start with the scoring ring size, convert it to an equivalent offset of the centre point of the bullet/pellet from the centre of the sighting bull, adjust this offset for the change in distance, and then convert back into a scoring ring diameter. For example, for a 50m rifle target scaled to 20m, the 10.4mm ten ring is equivalent to a bullet centre offset of 10.4mm/2 plus 5.6mm/2 which is 8.0mm. This 8.0mm offset from the centre of the sighting bull can be scaled to 3.2 mm (8.0mm times 20m over 50m) and converted back to an scoring ring with a diameter of 0.8mm (3.2mm less 5.6mm/2, doubled). Mathematically, this procedure corresponds to the following formula:

nrd = ((srd+pd) x ntd/std) – pd

where

nrd = new ring diameter
srd = standard ring diameter
pd = pellet/bullet diameter
ntd = new target distance
std = standard target distance

As the target distance is reduced, the 10 ring becomes smaller and eventually become zero when the group size is twice the bullet/pellet size. Outside scoring then becomes the only possibility with a outside scoring ring diameter being the pellet/bullet centre offset (from above) plus 1/2 the pellet/bullet diameter, doubled. The formula is

nrd = ((srd+pd) x ntd/std) + pd

where

nrd = new outside scoring ring diameter
srd = standard (inside scoring) ring diameter
pd = pellet/bullet diameter
ntd = new target distance
std = standard target distance

This formula will work with a scoring gauge (plug) that’s the same diameter as the pellet/bullet (the only kind of ISSF gauge for 5.6mm/.22 cal rifles and pistols). For air rifle and pistol, you’ll need a 4.5mm inward scoring gauge as described in section 6.3.2.8.4 of the ISSF rules. If you want to use an air rifle or air pistol 4.5mm outward scoring gauge (described in sections 6.3.2.8.5 and 6.3.2.8.6) where the measuring edge diameter is larger than the pellet diameter, you’ll need to increase the diameter of your scoring rings appropriately.

Hope this helps,

Dan

Hi Dan,

your posting is right. The normal scaled targets are for dry training. Therefore you don't need scoring rings, only the scaled black bull. If you really want to shoot on the small distances, you need some scaled pellets. In reality this is not possible, so your way to targets with transformed rings is the right solution. For air rifle there is only a target with outsize scoring possible.


Regards from Germany

Frank