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Wild_Bill
Reply with quote  #1 
Hi all i have just tested the 115gr DTAC at 1000 yards i have been shooting the 107gr Sierra Molly with 34gr Vargett in my dasher with an 8 twist 26" Maddco barrel. on sat it shot verry well with 3.5 moa wind on at 1000 yards 35" approx then i switched to the 115gr DTAC with 32.5gr Vargett it neded 3 MOA to have the ammo centred on the target and also required another 2 moa for the wind. they grouped well but not as good as the Sierra 107 as i shot a 6.5" group with them but the extra wind drift and extra elevation with the 115 was not worth the extra weight in my short barrel. The one thing though is thay stabalised well with no problems at all.

Cheers Bill
Australia
dmoran
Reply with quote  #2 
Bill,

With 1-1/2 grains less powder in the 115's, the velocity difference would be huge!!!
Most that I know, including myself, keep the 115's 50 to 100-fps from the 107's. My best load for the 115's is the exact same load that I use for the 107's with no extra pressure (maybe even less sign of pressure).

32.8-gr of RL-15 w/ CCI-450-m:
107's = 3055-fps
115's = 2975-fps

33.1-gr of vv-N140 w/ CCI-460-m :
107's = 3035-fps
115's = 2960-fps

The Wind Drift difference between these speeds gives the 115's the advantage by around 8" of drift from a 10-mph cross wind.
That is alot!!! Especially in F-Class or High Power where more shots are fired over longer times.

They group almost identical for me at 1000yds with a very small edge from the 115's in one barrel and just the oppisite from a 2nd barrel both chambered in 6-Dasher.

Happy Shooting
Donovan
Cheechako
Reply with quote  #3 
Bill

I think Donovan nailed it. When I switch from 107 to 115 I actually increase the powder charge slightly to compensate. You'll have to do some testing to determine if you can actually increase the charge in your particular rifle and if so, how much. I like to keep the velocity of both bullets about the same because that seems to give the best accuracy, in my rifle. I'm sure your results may vary and you may not be able to do that but the only way to find out is to test.

I see that you guys are now hooked on 1000 yard shooting. Time to start looking for a bigger cartridge. I'll send you a couple of cases to ponder. I got your e-mail.

Ray
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