I need to push a 180g 30cal over 4000fps what are my options

ICANHITHIMMAN · #1 07-06-2010, 09:19 PM

Hay guys this question is for my father in law he got me in to this and he is a speed whore! Right now he is pushing some 115 BARNS 30 cal bullets at 3500+ out of his 300 RUM its his thing he likes to go fast.

He wants a 30 Cal that will push 180g at close to 4000 FPS I did not have any advice for him. I said 30-378 but I know it will not go that fast.

He wants to go fast so I need sugestions???

Jon

Camshaft · #2 07-06-2010, 09:26 PM

Its probably going to take some kind of. 308/408ct hybrid. Kirby can probably build it of get you headed in the right direction

Broz · #3 07-06-2010, 09:27 PM

I have pushed a 168 gr over 3700 in a 30-378. But the brass life was short.

This is something Longtimelongranger can help you with I bet.

Jeff

ICANHITHIMMAN · #4 07-06-2010, 09:33 PM

Quote:

Originally Posted by Broz

I have pushed a 168 gr over 3700 in a 30-378. But the brass life was short.

This is something Longtimelongranger can help you with I bet.

Jeff

Thanks alot guys Im hoping Kirby Will chime in or anyone for that matter who can give me help. He works 24/7 and has been out of the loop for some time.

Broz · #5 07-06-2010, 09:39 PM

Quote:

Originally Posted by ICANHITHIMMAN

. He works 24/7 and has been out of the loop for some time.

Thats good!! Because if he had very much time to shoot he would go broke buying barrels for this thing...

Jeff

ICANHITHIMMAN · #6 07-06-2010, 10:04 PM

Another veary good point and Im trying to talk some sense into him but I haven got there yet he is stuck on speed I dont get it but oh well he has money to burn I guess.

phorwath · #7 07-06-2010, 10:16 PM

I've never read of muzzle velocities reported near 4000 fps with a 180 gr .308 bullet. Of all the members of this Forum, Kirby comes to mind as the best source for the lowdown on such an ambition. I'd send him a PM.

To my knowledge, Kirby never marketed a .300 Allen Magnum. He jumped from his 7mm Allen Mag up to the 338 Allen Mag. IIRC, he wasn't able to design or conceive of a practical 300 Allen Mag that substantially improved upon the 300 RUM.

My guess is that 4000 fps with a 180gr .308 will not become a reality with any shoulder-fired weapon that's practical for hunting, at least with the use of brass casings. The college effort might involve the use of casings with screw on steel case heads that allow much higher pressures to be employed without blowing gases out around the primer pocket. The first point of failure would likely then be from the equivalent of a pierced primer. I knew of a guy about 20 yrs ago that was having steel case heads custom built for his .338-.378 Wthby Magnum. He was able to run the case pressures substantially higher than with brass casings. The overall casing length was increased from the standard brass casing, and each custom manufactured casing was very expensive. He had to have a custom reamer built for the elongated cartridge case. The steel case head more or less screwed onto the meaty portion of the .378 Weatherby case heads. This guy was a doctor with plenty of money to burn. I don't know the details on the velocities he was getting. My information was 2nd hand from my brother who's a local gunsmith and gunshop owner. I think the effort was rather short lived, because I only heard about these steel case heads for about a 1-2 year time period. There were probably some safety and cost-effectiveness issues that brought the experimentation to an end.

At the elevated pressures, barrel life would likely be significantly reduced.