Wildbillz
Member
- Joined
- Apr 10, 2010
- Messages
- 1,024
Hi All
So I got this Chronograph so I could know what's going on with my reloads. Its a CED M2. I took it to the range and got it all setup. Started shooting across it and found my velocity's were way lower then I expected.
So first question; How do I know if the Chronograph is reading true?
I first fired a five shots of surplus 308Win (CAVIAM) I was expecting to see about 2700 fps, maybe a little less as the rifle only has a 18" barrel (Savage 110 Scout rifle). My first shot came in at 2437 fps, average of all five shots was 2452 fps the highest being 2474 fps. After firing all my test loads and recording the info, I fired a last string of the control ammo and got an average of 2452 fps. Next time around I am going to get myself a few rounds of the LC that is available right now and see what sort of velocity's I get with that.
So was I expecting to much from the control ammo? How much difference would a longer barrel make, if any? Will the ambient temp make a difference in my velocity's?
Next I fired some 5.56mm (Malaysian) across it and an average of 2891 FPS. I was think it would be closer to 3000 fps? Then I shot some of the ammo I loaded (23grn of AA2230 with a USGI pull down 55grn Fmj) expecting 3000 fps per the spear manual and got readings in the 2500 range? from the manual they were using a 22" barrel and I only had a standard AR lenth one with a 1 in 9 twist.??
When I tried it on the pistol range I started to get a lot of errors messages on it. The sky had gone a bit over cast so I don't know if that was messing with me or not. But most of my pistol velocity's seems a little low also.
Any advice on how to use this thing and or what to make of the readings that I got?
Thanks
WB
So I got this Chronograph so I could know what's going on with my reloads. Its a CED M2. I took it to the range and got it all setup. Started shooting across it and found my velocity's were way lower then I expected.
So first question; How do I know if the Chronograph is reading true?
I first fired a five shots of surplus 308Win (CAVIAM) I was expecting to see about 2700 fps, maybe a little less as the rifle only has a 18" barrel (Savage 110 Scout rifle). My first shot came in at 2437 fps, average of all five shots was 2452 fps the highest being 2474 fps. After firing all my test loads and recording the info, I fired a last string of the control ammo and got an average of 2452 fps. Next time around I am going to get myself a few rounds of the LC that is available right now and see what sort of velocity's I get with that.
So was I expecting to much from the control ammo? How much difference would a longer barrel make, if any? Will the ambient temp make a difference in my velocity's?
Next I fired some 5.56mm (Malaysian) across it and an average of 2891 FPS. I was think it would be closer to 3000 fps? Then I shot some of the ammo I loaded (23grn of AA2230 with a USGI pull down 55grn Fmj) expecting 3000 fps per the spear manual and got readings in the 2500 range? from the manual they were using a 22" barrel and I only had a standard AR lenth one with a 1 in 9 twist.??
When I tried it on the pistol range I started to get a lot of errors messages on it. The sky had gone a bit over cast so I don't know if that was messing with me or not. But most of my pistol velocity's seems a little low also.
Any advice on how to use this thing and or what to make of the readings that I got?
Thanks
WB