Yukon

Yes, IMHO it could well have been proofed for Nitro if built for it.

I'd like to see the photos of it.

the first 600 and a similar gun but in 577 NE were built at the same time, which is why I asked for the serial number.

No one could get it to shot until they tried a full Nitro load in it and then it went perfectly so it will be interesting to see if you ever try a Nitro load if your gun shoots - or a 75% Nitro for Black load ????

I have some copies of the Jeffrey records from that time period, I just have to find the damn things !!!!