Help from those with Quickload please.

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Thanks, that's excellent info.
Is there a reason to adjust the MV as opposed to BC or is it just the done thing? If the published BCs are wrong anyway would it make a difference to the trajectory outcome adjusting the BC? (not that I care which one I adjust, if I have to, just trying to understand the process).

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Short answer:- Because Bryan Litz says so!

Slightly longer and more informative answer:- The team at applied ballistics found while doing testing with very expensive and "Lab calibrated gear" that you get best results truing the velocity first and then do a second truing of BC past the subsonic range if you intend to shoot that far.

For the average hunter shooting inside 500, you could true either and get good results.
the reason I suggested Muzzle velocity for you is Quickload is only a stab in the dark and the Ltiz BC I gave you will be much more accurate, (True the least known factor)
So if I had a speed form a loading manual and a factory BC I would true Speed
If I had a Chronographed Speed and a BC from bullet manufacturer I would true BC first.
If I had a Chronographed Speed and a tested BC I would true speed.

Remember BC sell bullets, so never trust a manufacturers data

https://www.youtube.com/watch?v=CdDEVYGYs3o&t=0s

Also there is nothing with truing twice if you want to get real accurate. So in your case true your speed at around 300 or so then try shoot another 100-200 past that and see if things still line up, if they don't true the BC.

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Originally Posted by winaa

Short answer:- Because Bryan Litz says so!

Slightly longer and more informative answer:- The team at applied ballistics found while doing testing with very expensive and "Lab calibrated gear" that you get best results truing the velocity first and then do a second truing of BC past the subsonic range if you intend to shoot that far.

For the average hunter shooting inside 500, you could true either and get good results.
the reason I suggested Muzzle velocity for you is Quickload is only a stab in the dark and the Ltiz BC I gave you will be much more accurate, (True the least known factor)
So if I had a speed form a loading manual and a factory BC I would true Speed
If I had a Chronographed Speed and a BC from bullet manufacturer I would true BC first.
If I had a Chronographed Speed and a tested BC I would true speed.

Remember BC sell bullets, so never trust a manufacturers data

https://www.youtube.com/watch?v=CdDEVYGYs3o&t=0s

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Awesome. That makes sense
Cheers.

excellent explanation @winaa

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Originally Posted by chainsaw

excellent explanation @winaa

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Thanks I'm glad it made sense.
@Shearer let us know what speed truing gives you, I'm picking in the low 2500fps. I always like to see how close quickload gets, I tends to under estimate speed with 2208 in my 7mm08.

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Originally Posted by winaa

Thanks I'm glad it made sense.
@Shearer let us know what speed truing gives you, I'm picking in the low 2500fps. I always like to see how close quickload gets, I tends to under estimate speed with 2208 in my 7mm08.

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Will do. Not sure how long it will take me to get around to it though.:)