Hi everyone, and sorry for a long first post and for resurrecting this old one, but I just came around this discussion and found it interesting with many good points made from all sides.
To me the answer to why .50GI cartridge did not catch up is that it was not meant to. It was designed IMO as a vehicle to drive sales of the guns and conversion kits for a company. And boy does this company excel in designing and building guns which are truly just pieces of art. So AFAIK it is proprietary and only available through this one company and if you want to use it you’d need to buy one of the company offerings.
Does it mean that the cartridge is not successful on the market due to design flaws? Obviously not, as there is no known data on how it would perform given an option to enter mass market. I think the cartridge is very interesting idea and gives lots of possibilities for a reloader. I voted for this round by buying a Model 1 and I am telling you that it is the most pleasant round to shoot. I have few pistols in .22, 9mm, 38, .357mag, 10mm, 45acp and while all these guns are fun to shoot too, my Model 1 in .50GI makes me smile every time I shoot it. Now, not to start a discussion on stopping power etc., I suggest still to take a look at the table (derived from GI site) which shows how .50GI is positioned vs other calibers with respect to these two hunting indeces.
Again, it is not for “stopping power” or “big and slow vs. small and fast” discussion, but merely for some type of a numerical measure to show what this round could actually deliver with different loads. I am sure that the guys from Guncrafter Industries have developed many more loads beyond those listed, but even those listed are different enough to have all the fun. BTW, the one which I did not include in the table, but like the most to shoot is GI 230 grain CHP, 7.1 grains of Bullseye, 1.220” OAL, velocity of 1000 fps. (TKO 16.5 and Thorniley scale of 68)
If you reload, the cost per round is not too bad either. I am averaging at 37c per round with me losing 20% of brass all the time (counted into this cost).
Now would 50GI be extinct? I sure hope not and do not see why would it either.
As for gun prices, those are in the middle of the range for semi to custom guns and deserve every penny IMO. You can easily spend this type of dollars on a quality 1911. And this is what this Model 1 gun is exactly. BTW you can buy it in 45acp too. This is what actually made me buy my gun. I shoot it in both calibers, but .50GI is having more range time.
So was this new cartridge even needed? What it does what others don’t?
It is like a Volkswagen W12 / W16 engine. It is only available in VW upscale cars. Why did not it catch up? Similar to this discussion here it was many opinions and technical debates on what does it offer vs other existing solutions and yet the fastest street car and the most expensive one on the market Bugatti Veyron is using W16 engine to delight of few lucky ones to even drive it. Can a Toyota do what this car does in real life road environment on city streets? You bet… But, there are and always will be other cars to serve other than utilitarian needs, if we call them needs..