Wildbillz
Member
- Joined
- Apr 10, 2010
- Messages
- 1,024
Hi All
I recently got a CED M2 Chronograph and have a couple of question. This is all pretty new to me so forgive me if I am asking a easy question.
So I reloaded some 9mm up to day and went out to see what I was getting velocity wise. I loaded 4.7grn of HP38 with 115grn FMJ bullet. COL of 1.135 I got the info from Hodgdon's web sight and from their manual. Velocity should have been around 1075FPS.
Just for fun I loaded up some at 4.2grn of HP38 and some at 4.5grn of HP38
I set the Chronograph up and fired the first five round and got a velocity readings of 1125, 1136, 1138, 1135, 1120. This was with the 4.2grn load. I would have thought it would be well below the 1075 published velocity due to less powder? When I fired the 4.7grn load I was getting 1240 fps velocity's out them.
On the bright side, 4.2grn cycled the guns and was pleasant to shoot. So I am thinking that's were I am going to load at.
Brass all looked ok. Primers still in place, not flattend out or cratered.
So I guess the question is how did I end up getting velocity's that were so far off? I was thinking maybe the Chronograph was to close to the gun? Or could I have miss set something up? Could the Chronograph have gone on the fritz? I am at a loss for what would cause this.
Thanks for your help
WB
I recently got a CED M2 Chronograph and have a couple of question. This is all pretty new to me so forgive me if I am asking a easy question.
So I reloaded some 9mm up to day and went out to see what I was getting velocity wise. I loaded 4.7grn of HP38 with 115grn FMJ bullet. COL of 1.135 I got the info from Hodgdon's web sight and from their manual. Velocity should have been around 1075FPS.
Just for fun I loaded up some at 4.2grn of HP38 and some at 4.5grn of HP38
I set the Chronograph up and fired the first five round and got a velocity readings of 1125, 1136, 1138, 1135, 1120. This was with the 4.2grn load. I would have thought it would be well below the 1075 published velocity due to less powder? When I fired the 4.7grn load I was getting 1240 fps velocity's out them.
On the bright side, 4.2grn cycled the guns and was pleasant to shoot. So I am thinking that's were I am going to load at.
Brass all looked ok. Primers still in place, not flattend out or cratered.
So I guess the question is how did I end up getting velocity's that were so far off? I was thinking maybe the Chronograph was to close to the gun? Or could I have miss set something up? Could the Chronograph have gone on the fritz? I am at a loss for what would cause this.
Thanks for your help
WB