in2anity wrote:So riddle me this batman - why is 2207 popular in the 45-70? Out of a 24" bbl, woiuldn'y you want something slower?
Just guessing, could be using cast bullets. Less resistance than traditional construction bullets.
in2anity wrote:So riddle me this batman - why is 2207 popular in the 45-70? Out of a 24" bbl, woiuldn'y you want something slower?
in2anity wrote:duncan61 wrote:Its a straight walled case
Implying that all straight-walled cases require fast burning powder? So what's with all the listed mid-burn loads such as AR2206H and even 2208? The question is not what, but why.
SCJ429 wrote:When a 45/70 fires you increase the volume of the combustion area very quickly, the bullet travels the length of the case down the barrel to double the area to be filled by the expanding gasses. To keep the pressure up you need to burn the powder quickly.
Oldbloke wrote:Just guessing, could be using cast bullets. Less resistance than traditional construction bullets.
in2anity wrote:Oldbloke wrote:Just guessing, could be using cast bullets. Less resistance than traditional construction bullets.
You somewhat read my mind OB - whilst I'm currently focusing on shiny pills, I keep thinking about my cast lead experiences - I kind of figured cast lead bullets must be a bit more slippery (explaining why they seem better suited to a faster-than-jacketed powder). I also shoot a lot of those Berry's plated bullets - they too must be more slippery than traditional copper jacketed bullets, because I've no doubt they like a slightly faster powder also.
Oldbloke wrote:Yeh, will be a bit slippery. But i was more thinking they would deform to fit the rifling with less pressure. Copper is less maliable. (harder)
in2anity wrote:SCJ429 wrote:When a 45/70 fires you increase the volume of the combustion area very quickly, the bullet travels the length of the case down the barrel to double the area to be filled by the expanding gasses. To keep the pressure up you need to burn the powder quickly.
you da man SCJ - thanks for that mate, makes good sense I take it that's one of the benefits of a bottleneck? I.e. the combustion area is essentially "throttled" by the tapered-down neck? (thus better facilitating a slower burning powder)
mickb wrote:Where is this random waffle useful? Probably nowhere :.