on board, enjoying the postings
Thanks
Mike
on board, enjoying the postings
Thanks
Mike
NRA Benefactor 2004 USAF RET 1971-95
Looks like your cruising for a bruising have fun!
My firearms project blog
Very Cool!
I think Jack First in SD makes springs. They have a website although the catalogs are still paper. I called and talked to someone who knew all 3 thousand and some parts.
Mal
Mal Paso means Bad Pass, just so you know.
I'd have expected .50 GI ammunition accuracy to be somewhere between those rather extreme extremes. I suppose its use in sniper rifles might have caused specifications to be tightened in recent decades.
Did those rounds actually have armour piercing bullets? I can't really see why they would be used in proof loads. With those pressure indications I would want to check up on the dimensions of the barrel the unknown Mr. Mack used.
My "proof" rounds were actually just standard ball ammo. The barrel is one of the tapered bore, chrome lined variations the military experimented with. The bore started at .510 at the chamber end and tapered to .506 or so at the muzzle. We had to ream the tops of the lands in order to chamber it as I did not have a removable pilot reamer.The combination turned those standard rounds into very high pressure loads thru that barrel. Hence my usage of the term "proof load".
I have since pulled the bullets from the remaining ammo I have and will work up a loading for them when the rifle is finished.
Which I hope will be soon!
I fired Mahdi Griffin Handgun (20" barrel) some years ago. It was an unforgettable experience. Custom handloads were what we used. A silliwet ram target at two hundred yards could NOT stop the bullet. The recoil and blast caused me to start flinching after several rounds. The first 3 were quite accurate though!
I doubt if the bore taper, when it was only to that extent, made much of a difference to the pressure, and you might find other .50 rounds did much better. Something has to be desperately wrong with the bullet or the charge for peak pressure to be as much as a quarter of the way down the barrel, by which time the constriction could only have amounted to about a thousandth of an inch. Unless, maybe, those rounds were loaded with stretched brass, and the chamber clamped the neck onto the bullet?
BP | Bronze Point | IMR | Improved Military Rifle | PTD | Pointed |
BR | Bench Rest | M | Magnum | RN | Round Nose |
BT | Boat Tail | PL | Power-Lokt | SP | Soft Point |
C | Compressed Charge | PR | Primer | SPCL | Soft Point "Core-Lokt" |
HP | Hollow Point | PSPCL | Pointed Soft Point "Core Lokt" | C.O.L. | Cartridge Overall Length |
PSP | Pointed Soft Point | Spz | Spitzer Point | SBT | Spitzer Boat Tail |
LRN | Lead Round Nose | LWC | Lead Wad Cutter | LSWC | Lead Semi Wad Cutter |
GC | Gas Check |