Looking for info as to the most event winning caliber for the BPCR .

The 45/70 by miles, next is the 40/65 for silhouettes.

If you mean long range shoots the 45/90 is a winner also.
BPCR here

Thank you Ireload2

A lot depends on which event you plan to shoot. The main BPCR events are silhouette, mid-range, creedmore, and schuetzin. Concho filled you in for the first three, and .32-40 is the most popular for schuetzen.

Dave

I will be putting together a rifle for a fellow who is new to the game and asked me what I thought as to the best caliber for all the shoots ? I advised 45/90 ! thought I would get some very good responce in this forum from people who really know . Thanks for the help concho .

Concho,
The trend in the silhouette and long range games is toward tighter twists because they want heavier bullets for less wind drift. This in turn makes for more recoil too.
I think there is a 12 lb weight limit for silhouette and a 15 lb limit for long range.

Barrel length is another factor. Some shooters report the barrel fouling out in a match if it is longer than 30 inches. This is due to the lack of adequate lube capacity on the bullet.

Concho:

Because of the differences of the games, no single chambering is "best" for all of them. The closest would indeed be the .45-70. If it were not for the 12 pound weight limit for silhouette, I would say the .45-90. The .45-90 may well be the best of all the BP chamberings in every respect, but the recoil is brutal in a 12 pound rifle. Some folks can handle it, but I am not one.

For silhouette and midrange, there is no better chambering than the .45-70. It is easy to work with and is a reliable performer. It can be loaded down for offhand shooting and stoked up for 500 meters.

For the long range game, the .45-90 is the cartridge to which all the others are compared. It pretty much is the standard, and rightfully so. NRA rules allow a 15 pound rifle and at that weight the .45-90 is quite manageable.

International long range rules limit the rifle weight to 13 pounds. I am in the early stages of building a International rifle and it will be chambered for the .45-70. This will be something of a handicap to the 90, but I believe less so than the recoil of a 90 in a 13 pound rifle.

The ultimate limit of one rifle for the BP games is the 12 pound silhouette rule. I suggest a 12 pound .45-70 as the ideal silhouette/ midrange rifle that will do a passable job at long range.

As for barrel length, I shoot 34" barrels. Maybe it is some sort of compensation thing...<g> I now wipe between shots, but had no difficulties when I was still using a blow tube. I think that if there is a "standard" barrel length it would be 30" for silhouette/ midrange and 34" for long range.

Glenn Fewless

This fellow is a hunter and wants to have a rifle caliber for both worlds , The 45/90 is what he chose, 34" 1in18"
barrel . Thank you all !