http://www.mssblog.com/2018/02/08/reloaders-corner-3-helps-for-easy-load-work-ups/

It’s not at all difficult to learn to develop your own loads, to essentially write your own loading manual.

To do this efficiently, you need to learn to load at the range. Right, right there near to where you’re testing. An unremarkable investment in a few tools and a little creativity can provide a way to take your show on the road.

if you try that, you better have an area away from the line.  Pretty sure the concussive blasts from other shooters is going throw off your powder measures.

What level of accuracy are you trying to achieve? If your weigh powder at the range, wind and other things will give you erroneous results. Ceiling fans can fluctuate your readings. I bring my Lee Hand Press and seating die with me and adjust seating depth at the range, that's about it. I will not drop powder there, too many variables and way too many distractions. I weigh to the .02gr so any wind will effect scale. Even .1gr will be affected without some sort of enclosed unit.

get a Harrells measure

I thought it was comical to imagine someone throwing powder at the range. Maybe if I had a 100 yard backyard in a more gun friendly state, like Kentucky...

Back in the day there was a group of ol timers who shot BR and did their reloading at the range. Just need the correct equipment

I thought it was comical to imagine someone throwing powder at the range. Maybe if I had a 100 yard backyard in a more gun friendly state, like Kentucky...

Many Benchrest competitors do it. Some of them use the same 5 pieces of brass throughout a competition. They are also known to cut kernels of powder in half to reach their exact weight which requires very accurate scales. Scales that do not so well in any wind. I have seen pictures of guys setups in the back of their pickup truck's campers. ---- I know of a guy who shoots F Class in the mainland who has a enclosed 30' trailer fully equipped for reloading at events. The equipment in there is probably better than most peoples home setup. He brought it out to the recent Berger South West Nationals and let other shooters use his equipment to ready themselves for the next days shooting. It can be done effectively if you do some research and prepare for it.

If you are looking to achieve optimum loads quicker in less range sessions, maybe look into purchasing Quick Loads and look into OBT (Optimum barrel time). If you input good data, it can get you pretty close.  Neck tension and seating depth can affect accuracy as much or more than powder charge. 

I thought it was comical to imagine someone throwing powder at the range. Maybe if I had a 100 yard backyard in a more gun friendly state, like Kentucky...

Muzzle loaders do it for every shot. Just saying.

That would be something to see at Kokohead.

 When I do load development, I have a lee hand press that I attached a "C" clamp.  I charge the cases at home with the various charge weights and just barely seat the bullets so they don't fall out.  When at the range I start with the minimum powder charge and bullets seated to the max mag length for semi auto, or to the lands for boltgun.  Once I find the charge weight, I use the seater at the range to seat the bullets .002" deeper at a time to find the tightest groups.

I don't waste a ton of projectiles, powder, and primers to find the right load.  If there is a charge that is too light or too heavy, I can finger pull the remaining unseated bullets out of the case and save the powder case and primer  for re-use

You are doing the right thing in a world that does not understand.
 All the great shooter of the past did this.
 They would load off the tail gate of there trucks,
 and some that had there own ranges would  loading right beside the range,
 I have 2 friends on the main land would shoot right out the window of there reloading shed.
dave