17 hornet

[Verminator 66]

really strange
was testing loads a few weeks back and got readings of 3500 FPS 3600 FPS
took another test the other day same load and only getting 3018 any idea lads

all the powders bullets and primers are the same

[kennyc]

weather? hotter one day than the other ?

[angrybear]

Sunshine levels, can effect some chrono's which is why you should always try to test away from direct sunlight.

[zx10mike]

???? chrono not worth spit or mental disability whilst reading data . to big a variation for sunlight.

[Verminator 66]

Thanks for all the input
Think heat could be a factor but 500FPS difference is a hell of a lot
As for the chronograph it's been fine on all the rest up to243 and different conditions

Head work

[zx10mike]

keep us posted

[Verminator 66]

Yes they are home loaded but never had that speed change with any home loads

[Verminator 66]

Will try another batch this wee sometime

[Randy Bohannon]

If it was one of the fold up ones, did you fold it out the whole way when you tested the batch the first time?

if a Chrony type is not folded fully out it reads fast.

also direct sunlight is a bastard for ruining readings.

[Verminator 66]

Yes it is a fold up one bit on a pod so got to open flat every time

It has Been fine but really hard getting read outs
I'm thinking it might need a service if they do one

[Verminator 66]

Well just a update
Had some better read outs today but still low
3250 fps with 11.2 gn powder
So bit better now still all in an inch at 100y so groups are spot on

[angrybear]

Well just a update
Had some better read outs today but still low
3250 fps with 11.2 gn powder
So bit better now still all in an inch at 100y so groups are spot on

Clean the sensors & change the battery ?

Could it be that the bullet/case has been crimped at slightly different pressure so one batch has more pressure build up ?
if your press was sat in bright sunlight the die's would warm & therefore expand which would size the case fractionally tighter.

[Verminator 66]

Clean the sensors & change the battery ?

Could it be that the bullet/case has been crimped at slightly different pressure so one batch has more pressure build up ?
if your press was sat in bright sunlight the die's would warm & therefore expand which would size the case fractionally tighter.

clean and new battery's last time and same this time

Don't put crimp on
But this time seemed more consistent
I think it is to do with the neck on the case some way
Just want to try one more batch to make sure they are the same again