Custom Drag Models (CDM)

[Lemonaid]

Learned something new from interview of Bryan Litz on Gavintube.
https://www.youtube.com/watch?v=O0JUvYKKhy4
A bit more in depth here https://precisionrifleblog.com/2019/06/0...ag-models/

[LRRPF52]

Good stuff so far!

Litz really pushed the industry and LR discipline into the emphasis on G7 drag models.

When I started working with the Finnish Sniping community in 2005-2006, they were already talking extensively about G7 drag models, and guys where having made or making custom turret decals for their .338 LM, 6.5x55, and .308 rifles.

I thought I was going to go over there and share my vast wisdom about LR shooting based on my military experience. Within the first minute of the first conversation with their senior snipers, I realized it was best for me to just keep my fat mouth shut, open up my ears and start absorbing everything they were talking about.

Their range estimation formula smoked the retarded garbage we had learned in the US Army and what was in all the US Sniping manuals at the time (probably still is), that I felt like an idiot for not seeing it myself. We were doing this insane conversion from inches to meters built into the math that just doesn't work in the field due to the time required.

Theirs is just TGT dimensions in mm / mils read = range in meters.

Since they did the research and testing on their artillery ranges and doppler radar ranges in Germany with the .338 LM, they gained a lot of practical data that supported a totally different BC modeling approach for accurate 1st-round hits/higher hit probability with that rifle (TRG).

In between time spent with them and the long-range shooters in the US, especially in Colorado with Ray Sanchez and Zak Smith when .260 Remington was really popular, I made the switch to .260 Rem since I was handicapping myself significantly with .308 in the military Sniper events.

I think Bryan's book came out in 2012, but I have some earlier articles he published where he had first measured a lot of the 6mm, 6.5mm, 7mm, and .30 cal bullets. The 6.5mm 107gr SMK and 129gr SST both had higher BCs than stated by the manufacturers in his testing. Most of the other bore diameters trended with over-stated BCs.

[Wethepeople]

Wind detection laser technology, when it becomes available to us mere mortals will be a game changer. No more excuses. It's your fundamentals!

Those Finnish snipers being ahead of the curve is not surprising. Being half Finn I might be a little biased.

Litz has my dream job. Can't believe how many shooters I've heard that from.