1/10th of a grain = how many fps?

[Pinecone]

Funny thing is, if you pull Federal Gold Medal Match ammo (the gold standard for off the shelf long range ammo), you will find larger variations, as it is loaded on automated equipment.

As was mentioned before, unless you have cases with all exactly the same internal volume, you will have variance with that.

 

[Muleskinner]

300 BO Load data I use indicates each grn is 100 FPS

110gn VMAX bullet min 17.9 grn 2200 fps 18.9 2300 fps max 20.0 2400 fps so in this case 1/10 grn would be about 10 fps

 

[E.Shell]

Funny thing is, if you pull Federal Gold Medal Match ammo (the gold standard for off the shelf long range ammo), you will find larger variations, as it is loaded on automated equipment.

The reason for this is that Federal loads into the OCW range, which provides great tolerance for both loading and the rifle characteristics.

 

[E.Shell]

300 BO Load data I use indicates each grn is 100 FPS

110gn VMAX bullet min 17.9 grn 2200 fps 18.9 2300 fps max 20.0 2400 fps so in this case 1/10 grn would be about 10 fps

What is your extreme spread?

It's easy to make assumptions that do not work out in practice. Sure, do the math, calculate the per increment change - perfectly logical, but just TRY to prove it out. It is hidden in the noise....

I would suggest that the overlap in velocity from a sample of your (any) rifle ammo loaded .1 or .2 grains apart will show that it is impossible to prove which load is which, especially near max.

This is why I posted above that unless your SD is ZERO, you just can't see such small changes.

 

[Pinecone]

The reason for this is that Federal loads into the OCW range, which provides great tolerance for both loading and the rifle characteristics.

Duh.

Actually, the performance of FGMM is how Dan came upon the OCW method.