Home Forums Lever Action Central Big Bore Levers >45-70 Cowboy blows up

From current post on Accurate Reloading:


http://forums.accuratereloading.com/eve/forums/a/tpc/f/8721043/m/9271015361

Ouch!

Thanks for sharing that info.

Out of curiosity I tried to replicate his load in Quickload. It calc'd 74% load density, so a double-charge seems unlikely.

QL calc'd pressure 30K lbs-psi.

They say with Glock pistols that lead buildup at the throat can cause dangerous pressure and KBs.

The shooter cited lead at the throat in his rifle too, I wonder if that was a factor.

Some pretty stupid comments about the Marlin 1895 at that forum.

Ringing endorsement from the king of same...

How would you know? You clearly don't know anything about anything.

Wow, anything twice?? Sounds like an insult for mathman to decipher for me so then I can really know whether I should be pissed or not...

And I don't care wheather you are or not jackass.

Give it a rest Swampy. Shane,I agree. It strikes me that the bullets were .460. Hardcast slugs are prone to leading as they seem to "skid". The description of the incident and the damage appear to indicate bore obstruction. Failure happens worst at the point of an obstruction. If the leading began at the first round,every round thereafter would deposit even more heavily on that one spot. Cumulative.ANY rifle would go "kaboom" under those conditions after a bit.

That moniker's already taken. Perhaps Biggest jackass...in the world might work better.

You reap what you sow...

Think I would put some creadence in the double load therory. His stated load of 25gr 5744 sounds about right for the bullet he used. I just physically checked and 50 grains of 5744 will fit in a Rem 4570 case with plenty of room left over. I could have seated some very long 550 gr bullets that I have for my Sharps and the powder compression would have been mild at best. So my guess goes to the double charge.

Dave, the effect stated appeared more consistent with a bore obstruction.

OT but--Does anyone know with absolute certainty what year these models starting going south in production?

Nope. Not true at all. Bores accumulate lead to a point and then settle out.

So,

What about the 450M now?

Snake

The 450 Marlin uses the same action as the 45-70 Government as does Wild West Guns 457 Wild West Mag loaded to in there data.....45,000 CUP which is sightly more in PSI and yes.....Hodgdons has data for the Marlin '95 unaltered(for strength) action to 45,000 CUP aka the 457 Mag.

I suspect some kind of barrel obstruction as the marlin has been tested to 62-65K in test for the 454 Casull and lasted about 20 rounds but didn't blow up either.

Jayco

As a side note: its interesting that the lil ol 1892 Winchester action is repro'd as a Rossi/Puma and chambered in 454. The lil ol 92 action stronger than a big bad Marlin?

Per an email question/response I had with Marlin tech support a few years ago ref the 1895 and 1985M actions, they are similar in outward appearance but the 1895M (450 Marlin) action is different and has a higher SAAMI pressure limit of 43.5K psi vs the standard 1895 action in the 45-70 of 38K psi.

The reason they gave is that the threads on the standard 1895 are "U" shaped and the threads on the 1895M are "V" cut. The "V" cut are a little shallower thereby leaving the walls of both the barrel and receiver a tad thicker and there are more per inch and therefore have more surface area and "stronger".

The difference in threads is why you can't interchange barrels between a standard 1895 and a 1895M.

Pure nonsense......

As is anything you say here!!!