Depending on the total length of the cartridge a repeater may have to be a special length custom action. A 338-408 loaded case needs 4.200" for a magazine port. Have to ask Kirby how long the loaded 50-408 shells are.
I can build extra length actions. [img]/ubbthreads/images/graemlins/grin.gif[/img]
Hi Dave your actions are awsome but what is the cost compared to a LAwton you do aswell have mags that will feed so their is also an option i would likelu place it onto one of the larger A5L's like the one in the post to me at the moment. I would likely use the 750GR A MAx or richards Wildcats in it as it will be a hunting rifle. Not 100% confirmed on the bore diameter i was even looking at shortening the BMG case and using a 375 projectile i could still do it in 375 with the 408 case if Richard Makes some large projectiles and also the Sierra in the Future.
Since i do not mass produce my actions they are more money than a Lawton. I haven't sold just a action, i use them for my custom rifle orders, can't get any built ahead. If you needed a special length action then i could build you one. A stainless action in 408 bolt face with magazine is 1500.00
The 375-408 is a very good caliber, Early results have been outstanding.
U can also take the 50 Spotter case and neck it down to 375 on up, i have a proto type i am looking to build, it has the 408cal bullet in it. It is very similar to the 416 Barrett round. Only draw back is you need a larger action and barrel. Case head is .800 dia, 408 case head is .635 dia. The 408 case will do almost anything the BMG case will do, less powder and smaller actions.
I have seated some 700 gr FMJBT Mil surplus bullets so the crimping groove is just ahead of the case mouth and the M8000 will eject these live rounds easily. I do not have a measurement as they are over in the shop currently.
The 750 gr A-Max will be significantly longer, probably by at least 0.500" and I am not sure if the M8000 will eject a live round nor feed these rounds. I will have to see where the OAL comes out to during load testing.
You could make the OAL much shorter by cutting the chamber with a very short throat but that would take up alot of case capacity with the large diameter bullet and relatively small diameter powder chamber.
I got some of Richard Graves short baring surface 750 gr ULD RBBT HPs to try. THey are a very short bullet designed for big game hunting with 50 cals and with the much shorter baring surface then a normal 50 cal if this weight, velocity should be much higher as well.
Also, the OAL of the round will be much shorter. BC is less though, no free lunches I supose!!
I would stay away from the shortened BMG necked down to 375, just more case capacity then you need for that bore. My 375 AM reamer should be here soon and in my opinion, that will be about the ultimate on the 408 case as far as velocity, energy and trajectory even compared to the 338 version. Only problem is available bullets, we need some heavies. In my opinion, Sierras proposed 375 gr 375 cal SMK is about 20 to 30 grains to light!!
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