Here's the question:

These were fired at 100 yards. The apparent consistent increase in velocity averaged about 20 feet per second for each grain of powder increase. But the last one jumped about 50 feet per second. Should I use 47.5 or 48.0 grains to establish an overall length and checking for accuracy?

I wouldnt take too much notice of the apparent jump.

I'd load 20 at 47.7-ish and shoot four x five-shot groups, measuring speed and accuracy to see what it tells me.

But that's just me. Not a lot of science in my approach.

I suspect with your choice of components you'll find accuracy quickly.

You can't shoot it at 100 and get meaningful data...

How many times have you been told that but still do the same thing and ask for the same analysis?

What am I missing here?

GregW,



I think you missed the question. I wanted to know about velocity jump. Did you happen to notice the chronograph didn't know how far away the target is and yet it gave me meaningful velocity information? But the other day I read a guy who shoots 1000 yard competition. He does all his load development at 100 yards, not some arbitrary longer range before he goes to 1000 yards with a new rifle or load.



It looks like you missed the question. Second, the long ranges were closed and won't be open for a week.

bobnob17,



Thanks. This is my first go with a .308. I will go with your suggestion.

You'll not go wrong with that bullet and powder. I really like H4895 with bullets from 130 to 168g in the 308 Win as well.

Good luck chasing your tail -

GregW,

Thanks. I will keep you posted.

I shot ladders with my 6mm BR and 7mm BR and your ladder looks like the ones I shot at 300 yards not 100 yards. In my opinion if you have that much vertical spread at 100 yards you have something wrong with your rifle or scope or your rifle hates that bullet. Just my 2 cents.

barm,



I wouldn't be surprised if the rifle doesn't like these bullets. I will give it another range session for groups with 47.7.

It became irrelevant because I didn't draw a pronghorn tag. The flat base Hornadys will work for the woods.

I would agree with Greg W. and barm.
100 yard ladders are worthless unless all you are looking for is chrono results.
If you want to do load development at 100 yards, you should be using OCW, not ladder.

I agree with the 3 of you.

Pretty obvious that you can't or else you wouldn't be asking for opinions on the innanet...

NO ONE I know who shoots F-Class or Short-range Benchrest develop loads @ 100 yards. But then again you're SPECIAL.