In this issue: Re: Summer biathlon target sizes Re: SCATT Re: Eley Cause of high shots? Simulators for the home? NRA Junior rifle school ******************************************************************** Message to Dan Robb from Raoul B. Salem Here is my method for target scaling. For this example, we scale the distances, and not the target sizes. Find the bullet-center diameter for each of the two targets, because it is this dimension which is of interest. If a bullet is shot so that its center is at the edge of the bullet-center diameter, then it is at the borderline between touching the target and missing the target. This criterion gives equal levels of difficulty, excluding wind-deflection issues. It does NOT give target distances which make both targets appear to be the same size to the shooter, however. The bullet-center diameter is obtained by adding one bullet diameter to the physical diameter of the target. For a 3.625-inch diameter target and a .22 inch diameter bullet, the bullet-center diameter is 3.845 inches. For a 3.5-inch diameter target and a .22 inch diameter bullet, the bullet-center diameter is 3.72 inches. Next, scale the distances for the two targets, to get the distance for the smaller target. Here, the 3.625- inch diameter target is assumed to be correct for 25 meters distance. Use the bullet-center diameters for the scaling. 3.72 inches ------------ x 25 meters = 24.19 meters 3.845 inches The above technique should yield target distances for equal skill levels, but not targets which appear to be the same size to the shooter. If you want the targets to appear to be the same size to the shooter, then use the actual physical dimensions of the target for the scaling. 3.5 inches ------------ x 25 meters = 24.14 meters 3.625 inches For this example, the target sizes are very nearly the same, and the target diameter is very large as compared to the bullet diameter. It makes very little difference which method is employed to determine the target distance for the smaller target. If you want to scale the center-shot ring of a 300 meter target to 10 meters (with a .308-inch diameter bullet at 300 meters and a .177 diameter pellet at 10 meters), then the difference between the two methods becomes somewhat more significant. Raoul B. Salem work 1-408-774-8388 1614 Hudson Street, Apartment 308 pager 1-650-940-3747 Redwood City, California 94061-2956 pager 1-408-289-7147 home 1-650-368-4998 raoul.salem@eng.Sun.COM facsimile 1-408-774-8680 ****************************************************************** >The Noptel's main advantage lies in being able to use it at >50m (or even 300m with enough prisms) as well as indoors (Not to mention >that it's easier to get things to Finland for repair than Russia). My apologies to SCATT for any confusion. I have in fact used both SCATT and Noptel products, and been impressed by both. What I meant to say was that while the SCATT could only be used at 10m, the Noptel can be used at 50m as well as 10m. I was hoping to compare accuracy of aim with real result at the target (including errors due to my match ammunition, wind, etc) and felt this gave the Noptel the advantage. Martin Sinclair ****************************************************************** >It was interesting to note that in the U.K. and elsewhere the amount of >shooters who are no longer using Eley ammo, because of the apparent lack of >consistency, however having been at the Commonwealth Games in Malaysia it >was interesting to see that of the 42 competitors in the mens prone event I >noticed no fewer than 10 competitors using Eley Tenex, 2 using Gold It was also interesting to see the age of the Tenex that was being used :-) I know that Steve Petterson (Individual Prone Gold) was using older Tenex. Tenex Gold is, apparently, on the way out. Once described as "the MD's bright idea that didn't work". While Eley are convenient for testing, have good facilities, and are helpful, I was unable to find ammunition to match or beat my existing stock of MIDAS L through my current barrel. I tried twice this year, and they laid on lots of batches, but no success. It was interesting to note that this year, Eley put up an Anschutz 1913 for the winner of each class at the British Championships using Eley ammunition. The first person in X-class to win a rifle did not even come near first overall. (Majority was Lapua, although the winner of the Agg was using R50 - Jon Hammond, Junior World Champion) Martin Sinclair - martin.sinclair@gecm.com ****************************************************************** I am having some difficulties geting a fix on the symptom or cause for the elevation shots I get both for UIT at 50 meters and Highpower at long range. I know that I am doing something to cause the elevation shots, which are just out of the 10 ring on 50m target. I am not sure of all the symptoms that may cause this. I think I have the same face pressure, stock is in the same place, etc.. But at least 50% I believe that I am the cause, and can't figure out how to correct it. I have tried most of what I know, and cannot seem to pin point the exact problem. Can any one shed some light on this. .. Thanks Terry ****************************************************************** Michael, What training systems are available for home use? How much do they cost? (I thought the last time I saw one they were still pretty expensive for home use.) Curt Ingersoll [Editor - the only ones I would consider for home use would be the CURT (~$1700), which I've heard is not made anymore, and the new RIKA system (~$1000), which I've not yet seen any real info on. Contact Neal Johnson in the US for info on the CURT if there is any. The RIKA will be carried by Pilkington Competition Equipment, but he hasn't gotten any info yet apparently.] ****************************************************************** NRA Junior Air Rifle/3-P School (Intermediate & Advanced) "The Exploration of Mastery and Excellence" 28-31 December 1998 at Coyote Point Rifle & Pistol Club, San Mateo, CA. Instructors Olympic Gold Medalist Launi Meili and Oylmpian Jean Foster. For information and enrollment contact Howard Harrison 415 776-9531 or e-mail hhzk24a@slip.net. ...................... Howard Harrison, Technical Coach NRA National Coach Development Staff hhzk24a@slip.net ****************************************************************** End of UIT Mailing List #4 Michael Ray - Systems Engineer Rose-Hulman Inst. of Tech. Rifle Coach UIT Shooting Page - http://www.geocities.com/Colosseum/1190/index.htm Michael Ray - Systems Engineer Rose-Hulman Inst. of Tech. Rifle Coach UIT Shooting Page - http://www.geocities.com/Colosseum/1190/index.htm