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I know we would NEVER do this, but what would happen if done? It does sound like a dumb question, but there is a claim it was done, & destroyed the gun. We have a full case, say minor compression & a standard 168 or so grain bullet loaded.
What would happen with a very slow powder used in a case not normally loaded with it? I just initially thought it wouldn't 'blow up the gun', but maybe I'm wrong on this. The low charge/open space 'detonation' I don't think would come into play? Just asking. I just picked the powder because it was a slow burn 50BMG powder.
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Campfire Ranger
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Low velocity is what would happen. Probably pretty similar to 4831 in a 41 Mag revolver - which I've done......many years ago. "Too-slow" powders in rifles can actually sometimes produce some very good light loads. Ken Waters' load work-ups sometimes indicated such. As you indicated, one probably is wise not to give much wiggle room in the case however.
Last edited by Klikitarik; 11/15/10. Reason: pour fpelling..
Sometimes, the air you 'let in'matters less than the air you 'let out'.
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Campfire Tracker
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Very sooty case necks at a minimum would be my guess. 4350 is about as slow as you can go in a .308 using heavy bullets and a compressed load for full pressure loads...and that is loaded extremely long.
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I only ask because a guy said '50BMG powder was mistakenly loaded in a 308 & it blew up my(his) gun'. I think he thought I was full of chit for questioning if this very slow powder would blow up the gun when loaded in a 308 case. I guess after all the '50BMG is very powerful round'. His gun did blow for some reason though.
I just though maybe there were other issues at play.
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Campfire 'Bwana
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Campfire 'Bwana
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I just though maybe there were other issues at play. Yep, probably the bottle of HP38 on the shelf nearby. 
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After looking at a number of new posts and some of the comments, it seems to me a lot of guys are getting bored with nothing to do. Geez, you guys, I thought hunting season was open in most of the Lower-48.
Anyway, The question piqued my curiosity - yeah, I should be outside plowing snow right now but....
Anyway, I ran the question thru my copy of Quickload and I assumed a 190 gr. Sierra bullet. What I came up with assuming a 100% load density:
H-50 BMG - 43.3 grs.
1595 FPS at 18861 PSI.
Only 47.4% of the powder would be burned.
Now, I don't always find QL dead nuts accurate but I think this would be relatively close to the actual results.
NOW!!! I gotta go plow some snow. Ya'll have a good day.
Later, Bear in Fairbanks
"Unless you're the lead dog, the scenery never changes."
Amazingly, I've lived long enough to see a President who is worse than Carter.
And finally,
Gun control means using two hands.
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Campfire Ranger
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Extrapolating from the estimated pressure and speed of Bear's info, I don't doubt that a second round might, on occasion, have problems with pressure due to a bore obstruction. I wouldn't be (overly) concerned with the possibilities, but I also don't see a need to try.
Last edited by Klikitarik; 11/15/10. Reason: qualifier
Sometimes, the air you 'let in'matters less than the air you 'let out'.
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Thanks, that's some good info. Yes It's hunting time down here. I'm saving myself for IL this Thursday though.
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Campfire Ranger
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After looking at a number of new posts and some of the comments, it seems to me a lot of guys are getting bored with nothing to do. Geez, you guys, I thought hunting season was open in most of the Lower-48.
Anyway, The question piqued my curiosity - yeah, I should be outside plowing snow right now but....
Anyway, I ran the question thru my copy of Quickload and I assumed a 190 gr. Sierra bullet. What I came up with assuming a 100% load density:
H-50 BMG - 43.3 grs.
1595 FPS at 18861 PSI.
Only 47.4% of the powder would be burned.
Now, I don't always find QL dead nuts accurate but I think this would be relatively close to the actual results.
NOW!!! I gotta go plow some snow. Ya'll have a good day.
Later, Bear in Fairbanks I hang my head in shame and stare at my toes while admitting that I have done this. Except it was a 30-06, 220 gr Sierra match-king and all the H870 I could get under the bullet. Results were exactly as predicted here. The bullet exited the barrel and did strike in the dirt downrange. Recoil was negligible. My action and magazine got filled with unburned powder granules when I opened the bolt.
People who choose to brew up their own storms bitch loudest about the rain.
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Campfire Ranger
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FWIW the older IMR manuals had loads for many of their very slow powders in cartridges that made you say WTF?.
I used I4831 in my 222, just for shiggles. It shot into one hole, but dirty as hell.
Utility? Yep, in some low speed cast loads with very soft alloys, though some combos are truly useless.
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Campfire Tracker
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I once tried some loads with aa8700 under a 150 in my 300 win mag. It shot really decent groups but the case neck and shoulders were absolutely filthy. I figured it was possible that I would get some pretty nasty "coatings" or carbon in my barrel using the load so I quickly quit the load. It was a published load I found somewhere.
RE the original question.....I think it's possible you could get some kind of snakey hangfire/detonation that could possibly cause a problem by using unpublished loads. If using full cases of super slow powder in small cases was a good idea I think we'd see more published "youth" loads and that's not out there anywhee.
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Was just looking at the paper in the Lee dies I have for the Hornet this morning. They show both 4350 and 4831 in the Hornet, a case more often loaded with powders in the 4227 and 2400 speed range.
Sometimes, the air you 'let in'matters less than the air you 'let out'.
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Campfire Ranger
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I'd expect low velocity, wide ES, and lots of carbon fouling.
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Campfire 'Bwana
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Campfire 'Bwana
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I tried a case full of H870 under a 120-gr bullet in my 25-308. Very smoky cases and low velocity were the reasons those were the only five rounds ever tried.
Cleverly disguised as a responsible adult.
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