Now yer talkin'!I am not personally interested in testing them for two reasons, neither is available (I have not looked elsewhere) and they are a lot more expensive than normal .400 bullets. If I were going to use those types of bullets I'd break out the .458 SOCOM, 300 gr. TTSX at 1700 fps or the 250 gr. Hornady GMX at 2000 fps. Or the .375 SOCOM with a 200-220 gr bullet at 2350/2150 fps respectively.
After a night of thinking about those ML bullets, I think I will test them out if I can find any. Why not? It would certainly make this a longer range rifle and much more suitable for deer. The handgun bullets explode so rapidly that penetration is quite limited and I am not sure I would want to use them on larger game, but the ML bullet might be just the ticket. I don't see it doing anything the .375 or the .458 cannot also do but since when does that matter?
Thanks for putting the bug in my ear.
Nosler said the same thing about their 300 gr. .458 diameter ML bullet but after being deluged with phone calls and email requests, they did release it without sabots, at least for a while. I don't know if they still sell it without sabots or not because I have not followed this bullet, so if Nosler will do it, you can bet Hornady will also IF they think it will increase sales and turn them a profit.When asked if the .40 SST ML bullets could be purchased by themselves, Hornady sales answered, "We do not sell this bullet by itself, we apologize for any inconvenience this causes." Perhaps if they received more inquiries...
First of all, this is not "my" wildcat but dreamed up by Tony Rumore of TROMIX. Tony got a hair over 3000 fps with the 135s but at higher pressures than 35-37K psi, probably up around 42K psi. In fact, using a 22 inch barrel QL says you get 3042 fps at 42000 PSI with N200. This load would be a mild load in a bolt action but creates way too much back thrust on the AR-15's bolt for sustained use. It might hold for several hundred rounds but it won't hold forever before the bolt lug fatigues and breaks. At 35-37K PSI ANY SOCOM based round will give the same backthrust as the 5.56. The .400 AR sounds like a ballistic twin of the 10mm SOCOM with these notable exception.Congrats on the birth of your new 10mm SOCOM wildcat, Big Bore. Enjoyed your reports, especially the water jugs.
FYI A sample of Thompson Center ML bullets (from Buds) measured .4000 in the majority, while the Hornady ones were mostly .3995. Hope you try some on the jugs.
Mentioned in the now abridged report is that with 135gr pistol bullets, the 400AR had a velocity of 3,042 fps, but with its greater capacity, it'll be interesting to see what yours can do.
Take a look at all the available rimless rifle cartridges over the last 100 years or so, and notice how few of them are straight-walled jobs. There is an excellent reason for this. A rim provides a good means of headspace and a datum on the shoulder an even better one. The case mouth itself, by comparison, is a poor means of headspace, especially if one reloads.The 400AR has a case head of .447, while the 6.5 Grendel has .445 and is SAAMI rated at a maximum average pressure of 52,000 psi, so does the 400AR max of 50,000 seem excessive? Also the 400AR case hasn't got a shoulder and very little taper, so doesn't that combine to produce less thrust on the bolt? And is it really fair to compare a .308 parent case wildcat like the .375 REAPER to 7.62x39/400AR-sized cartridges?
Anyway, it'll be interesting to see how the 400AR, the 10mm SOCOM and other wildcats develop to fill in the AR-15 10mm/.40 caliber gap.