If you were in your twenties I'd agree with your assessment of the differences between an apprentice and a master craftsman. You were a master craftsman albeit a different craft. Before retiring I was an Engineer and Major Projects Manager. We used to say that a good journeyman could do 90% of another journeyman's job. I believe that is the case with you.
Just had a yarn with A G, and he has filled me in on how much work he puts in to such developments, referencing QuikLoad, tightening tolerances, load development, range testing. He indicated that of you wish to contact him directly he can go into details far better than I.
If you wish , contact him directly, he has given the OK for me to pass that on.
Going through and old thread I see you mentioned having a William Douglas double in 470NE for sale. Just touching base to see if you sold the rifle, or if it was still for sale?
Hi again do you think you could message me your email or some other way to contact you, I've been having error messages trying to send messages via private conversations to you since last night, sorry!