10 Spot Terminator
Member
- Joined
- Feb 9, 2013
- Messages
- 39
- Reaction score
- 5
I have owned the very same unit you are considering for over 12 years now and with the exception of having to replace the sky screens once as are prone to cracking from constatntly taking them apart and putting them back together . It has been a decent tool as long as you stay within its operating ranges with respect to light and shadows as stated in the manual . I could not have developed the loads for the mumerous firearms I have loaded for over the years with the results I was able to obtain without it . It can tell you so much about loads as you work them up that you otherwise would only be making calculated adjustments based on bullet groups alone .
some of the things it will help you cypher is the differences that effect consistant performance such as primers, amount of crimp , lead alloys of different hardness in a given bullet , the lubes associated with cast bullets , when pressures start to exceede the limits of a lead alloy in cast bullets , performance difference at different temperature extremes with a given powder just to name a few .
For those who consider using bullets that are moly coated a chrony is a definite necessity as pressures are reduced using moly and the chrony will take you back to acceptable pressure levels based on your velocity results .
All bullets be they jacketed, hollow pointed or cast have an optimum performance range in relation to velocity . As all firearms tend to shoot a given load with varying results insofar as velocity goes a chrony here is invaluable . Posted speeds in all loading manuals come as a refferance only and only give you a general idea of potential velocities obtained with the VERY SPECIFIC test equipment as well as the bullet they used in their load workup . Many have been the times I worked up a load using the same components as well as barrel length and twist rate to have my loads vary by as much as 200 fps ( usually slower ) and fall low or under velocity needed for proper hollowpoint performance in pistol loads . Without a chrony I would never have known . Changing powders most often found the performance I was looking for but here again I never would have known were it not for the chrony . The reverse would be true of over driving hunting bullets in rifles where the bullets would tend to come apart and not retain enough of the bullet weight to do a good job . Faster isnt always better and again the chrony is a good tool to have on hand to help you work though this without having to shoot up so much of those hard to come by components .
10 Spot
some of the things it will help you cypher is the differences that effect consistant performance such as primers, amount of crimp , lead alloys of different hardness in a given bullet , the lubes associated with cast bullets , when pressures start to exceede the limits of a lead alloy in cast bullets , performance difference at different temperature extremes with a given powder just to name a few .
For those who consider using bullets that are moly coated a chrony is a definite necessity as pressures are reduced using moly and the chrony will take you back to acceptable pressure levels based on your velocity results .
All bullets be they jacketed, hollow pointed or cast have an optimum performance range in relation to velocity . As all firearms tend to shoot a given load with varying results insofar as velocity goes a chrony here is invaluable . Posted speeds in all loading manuals come as a refferance only and only give you a general idea of potential velocities obtained with the VERY SPECIFIC test equipment as well as the bullet they used in their load workup . Many have been the times I worked up a load using the same components as well as barrel length and twist rate to have my loads vary by as much as 200 fps ( usually slower ) and fall low or under velocity needed for proper hollowpoint performance in pistol loads . Without a chrony I would never have known . Changing powders most often found the performance I was looking for but here again I never would have known were it not for the chrony . The reverse would be true of over driving hunting bullets in rifles where the bullets would tend to come apart and not retain enough of the bullet weight to do a good job . Faster isnt always better and again the chrony is a good tool to have on hand to help you work though this without having to shoot up so much of those hard to come by components .
10 Spot
