The 40-110 WCF, aka the 40-110 Winchester Express was brought out in 1886. Bullet diameter .403, loaded length, 3.63". Can be made from 450 Nitro Express case, but was very likely developed from the 50-110 case, as the 40-110 is a bottleneck case. Bullet weights would have been correspondingly light, likely in the 300 - 330 gr. range. It was made for speed, not slugging power.