I've been reloading for a little over 4 years now and have never shot thru a chrono until this week, in the past id just work up different loads until id find the most accurate load and never worried about how fast they shot, I purchased a Savage LRH 7mm a couple months ago and have found a couple loads that shoot great so I borrowed a friends chrono and was just going to use which ever load shot the fastest since they all group the same on paper, when I shot thru the chrono I had a variance of 300 fps between 9 shots of the same load, I measure out each load individually and know they are all the same, so I grabbed my AR15 and my bolt action 223 and shot them thru the chrono and only had a variance of 12fps between the 2 guns and I use the same process to load for all my guns, any ideas why my 7mm is so inconsistent
how close to the chronograph were you shooting? A 300 fps variance seems far too extreme to me to be consistant POI. If I had to guess I would say that the chrony was being affected by muzzle blast from the bigger gun to get that big of a difference. When shooting my bigger guns ( well big to me anyways) I have had the chrony out as far as 30 ft to get a proper reading on it. Hope this helps.
None Magnums ------- 10 ft
Magnums without Muzzle brake--------12 ft
Magnums with Muzzle brake----------15 ft
When I set up my chronograph, before I shoot the big boys I run some
0.22 LR bullets through to make sure all is fine. My chronograph will read my 0.22's and the pellets from an air gun at any of those distances.
Jesus Christ the same yesterday, and to day, and for ever.
Our Lord Jesus said that as it was in the days of Noah and
also as it was in the days of Lot so it shall be in the days...
It's happening again!!! God sent to us His prophet, and His Word
to this generation and we once more are rejecting it as was prophesied!!! ---> As promised, God Sent His Prophet to us!