Wat twist is your rifle? Most (but not all) 54's will be slow twist. If so you'll want a short conical if not using round ball.Having recently gotten my first BP rifle, a .54, and looking around for bullets I can say that there is a LOT more variety for .50 and more dealers - even heavily BP oriented places - carry more .50 stuff than the other calibers.
Wat twist is your rifle? Most (but not all) 54's will be slow twist. If so you'll want a short conical if not using round ball.
I think you've answered the thread title.I think the companies marketing BP stuff have kinda standardize every thing to 50 cal because of the In-line craze that dominates sales. Nearly ALL in-lines are 50 cal & the traditional rifle makers are producing rifles in the caliber that balls, bullets, sabots, etc, etc, are being mass produced & readily available so the buyer can see it all of the shelf right in front of him when he buys the rifle. Name me one walk in store that people across the country can go into & find 32, 36, 40, 45, 54, or 58 cal stuff, let alone the bigger bore items. Just the nature of things. What ever people think here is the most "most popular caliber" is meaningless in the grand scheme of things. It's about SALES!
I have never understood the need for "heavy" powder charges. The .58 Zouave I used to shoot Minies, took 50-60 gr and that was the std. load, from the civil War till today! It would shoot just fine! My .50 and .54 RB rifles get 65-70 gr max and also shoot fine. In BP I do not think you get a lot of benefit of burning heavier charges. More flash, smoke, noise and recoil but not performance (IMHO)Many of the original rifles were 1:48 or close to it and most of them probably never seen anything other than a PRB. They shoot just fine.
Here is my hypothesis about what happened. I think that the slower twist allows you to use a higher powder charge to get more muzzle velocity but a high velocity in a 1:48 gets you a higher rpm. That higher rpm can lead to inaccuracy if the ball is mishapen or has voids. I think the slower twists allow for a higher muzzle velocity without increasing rpm too much. However if you look at a chart a PRB slows down so quickly that extra powder being burnt really does not equate to that big of an increase in down range performance.
Just my thoughts on the subject.
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