Velocity Changes Rapidly

[Stormin_67]

How am I ever going to be accurate when my velocity changes so fast?? The other day I took my rifle and chrono out to check the velocity differences w/a suppressor and w/o a suppressor. Shooting a custom 6.5 CM w/a 22" H-barrel, my velocities changed rapidly on a cool day. I am new to LR- shooting. I consider LR 1k.
First 5 shots suppressed
2645
2693
2663
2682
2706
Second 5 shots w/o suppressor
2725
2685
2702
2721
2730
Next 5 shots suppressed again
2709
2756
2792
2790
2850

Well, as you can see, the more I shoot the greater the velocity, this was 15 shots fired slowly ion a 48 degree day. Doesn't seem to matter wether the suppressor is on or not, velocity continued to climb regardless. How do I work this in at the range when I go stage to stage w/ varying distances and temperatures???

Additionally, I can't find a software that simulates my actual drops, most are on at some point but off elsewhere??

I am shooting factory Hornady 140 gr match ELD ammo.

Thanks


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[russ69]

Load your own, that load is not consistent. The numbers really seem a bit wide in range, perhaps a chrono issue? Also you'll have a different zero with and without the suppressor. What do your groups look like?

[Stormin_67]

Velocity Changes Rapidly

Load your own, that load is not consistent. The numbers really seem a bit wide in range, perhaps a chrono issue? Also you'll have a different zero with and without the suppressor. What do your groups look like?

Just purchased the Supressor, only had it out to the range one time. Had dialed my 6.5CM in on steel at 500 & 600 w/o the suppressor. I put the suppressor on and it wasn't far off at either distance. I will cross check my chrono tomorrow w/ another one, maybe mine is off? I will also put a few suppressed groups together. Will be shooting from 200 to 1k.

I was trying to hold off on reloading my own until Lapua makes their brass for the 6.5 CM. Hadn't heard a lot of good things about Hornady brass once fired a few times? Was wanting to use the H4350 to get some better consistency.




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[Stormin_67]

Velocity Changes Rapidly

A little more data, actual MOA drops at given distances. 100 yd zero

235 - 2 MOA
300 - 3.25 MOA
375 - 4.25 MOA
400 - 5.25 MOA
500 - 7.75 MOA
585 - 11.00 MOA
600 - 11.00 MOA
630 - 13.00 MOA area change
650 - 13.50 MOA
700 - 15.75 MOA
900 - 24.50 MOA
1000 - 29.25 MOA

70 degrees
1000' altitude
40 % humidity
29 pressure
Hornady ELD 140 match

I can't get a trajectory table to match up w/ my results, have been to these distances x2 now and duplicated near identical results. Using .610 G1 & .305 G7



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[russ69]

...I can't get a trajectory table to match up w/ my results, have been to these distances x2 now and duplicated near identical results. Using .610 G1 & .305 G7

You never will match up. Lots of reasons why. You have to refine your own zeros, the tables are just a starting point.

[Stormin_67]

Thanks, that helps!!


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