[quote=srwshooter]with black powder/bp substitutes being a total explosive it should burn everything you put in it.
Yes, and no. BP is an explosive, but it's blast characteristics are much different than smokeless powder, and thus the pressures generated are considerably different.
take your ml and shorten the barrel 5-6in ,i bet it will shoot faster. only thing slowing the bullet down is friction,less time in the barrel,less friction. short barrel shoots faster.
with smokelss it would lose speed.
Really
This has to be the dumbest advice I have ever heard concerning internal combustion properties for blackpowder or smokeless powder.
You need to shut the fugg up,stop putting out bogus science about friction and go read up on barrel lengths and powder burn rates.
Seeing the OP,s numbnut thread about "How I want to shoot smokeless powder in my new Remington 700 BP and BP substitute ML",is enough to drive anyone with common sense bonkers, the OP needs no help in injuring himself and is going to shoot smokeless powder in that gun come hell or high water no matter what anyone says to him about the danger of it.
The guy would lose probably anywhere from 20-50 fps in velocity for every inch he lops off a barrel.
And have unburned powder spewing out the barrel(probably half his charge)from lack of barrel length to burn the charge properly.
This is the stupidest advice I have heard in ages. This poster must be one of those gunshop pro types.
[/quote well,its very obvious that you have no clue what you are talking about.black powder is a explosive and does not burn at a so called burn rate like smokeless powder. you will gain speed with a ml barrel if you shorten it.i cut my tc triumph down to 20in long and gained speed. its been done,its a fact.i've seen it done with 2 tc ml'ers and a knight.oh,by the way,the guy that got me interested in cutting the barrel on my tc is a custom muzzleloader builder that shoots national events and was sponsored by knight for over 10yrs.i think he knows what hes doing.i watched him do his knight hunting ml and after seeing his results i did mine. the numbnut(op) is a good friend of mine and he is not planning on taking a rem ml out and shooting it with smokeless powder unless its been tried and tested to be safely done. he is only trying to see if anyone out there has done it yet.someone will do it very soon ,i'd bet on that.until you learn more and know what you are talking about stop the [bleep] name calling.
Hatcher's Notebook, (by Julian S. Hatcher, 3rd edition, June 1962).
This is a proven fact already well documented in the field of internal ballistics, but it does not always occur in high powered rifle cartridges, and I'm unsure if it would ever occur in the context of this discussion.
The bullet is pushed down the barrel from pressure that peaks and is declining within milliseconds. Pressure behind the bullet begins to decrease, and if the barrel is long enough, at some point, the friction of the bullet against the bore, combined with the air pressure in front of the bullet within the bore, will equal the decreased pressure behind the bullet. At that point, the bullet cannot go any faster, and the friction of the remaining barrel length will slow the bullet prior to exiting the muzzle. High powered rifle cartridges may never reach this point within standard barrel lengths. But, a 22 rimfire, as example, will reach this point of equal pressure at approximately 14" to 16" down the bore. Beyond that point, friction from the barrel can slow it down.
In terms of explosive black powder and patched round balls, I do believe someone like Dixie Gunworks, tested a mid-bore muzzeloader for this effect. I recall they used a 40 or 45 caliber, with something like 40 or 45 grains of powder. Do not recall the starting length, but it was fairly long. They tested for velocity, cut the barrel down, tested, and kept shortening the barrel and testing. In that test, the barrel always lost velocity when cut shorter. Even with the longest barrel, the effect of equal pressure was never reached. So in terms of 100 to 150 grain volume charges of Blackhorn behind a 50cal sabot/bullet, I'd have no clue as to how long a barrel would need to be for the sabot/bullet to reach that point of equal pressure. It could be 28 inches or it could be five feet, I don't know.
Best
