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> Rifles general discussion
> Group size and extreme spread.
Group size and extreme spread.
@ 02:17 am (GMT) |
Ed StewartHow does the difference in the ES of your rounds affect the group size? I know that at long range the higher the ES the more vertical spread you get in your groups. I am finding with my .22-250 that when I find a spot where the ES is 10 or 11fps the groups are about 3/4moa. But when the ES is close to 50fps then groups are easy 1/4moa. I noticed the pattern from 35.0g of AR2208 to 38.0g then I increased in 0.1g steps to 38.5 and the groups closed up as the ES got larger. I still need to find the time to bed and stabilize the stock so maybe that has something to do with it?Cheers, Ed. |
Replies
@ 05:08 pm (GMT) |
Nathan FosterRe: Group size and extreme spread.Its bloody annoying when this happens Ed. You can work out the effects if you have a ballistics program, using the info to check on how the bullet will perform (vertical spread / deviation) at extended ranges (if the rifle is to be used at long ranges). Otherwise, if it is a 300 yard gun,m I would not worry too much.Yes, bedding could help increase accuracy of the .75" load. Neck tension is another variable to play with. If you get a chance, size a few cases without the expander button, then test the 38.5gr load etc. |
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@ 05:34 am (GMT) |
Ed StewartRe: Group size and extreme spread.Ok I will have a bit of a play and see what happens. It is only used at short ranges so the ES doesn't really matter. I like using the 22-250 to learn more about reloading and seeing what effect on accuracy different changes have. Projectiles and cheap and easy to shoot all day long.Cheers, Ed. |
@ 05:54 am (GMT) |
deerndingoRe: Group size and extreme spread.+1 on neck tension. I chased accuracy via bedding, concentricity and ES. I found I finally got good results when I included neck tension in the formula.I now size necks via a K&M neck expander and lube the internal neck with graphite. It leaves little neck tension and means I take care of my ammo. FWIW |
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