I agree with what you said about every gun liking different loads because they are all different in very slight ways. I guess I neglected to mention that I spent almost two years and over 2000 rounds of 56-50 hand loaded ammo before I decided to have it relined. I tried hard lead, alloyed lead and pure lead.....Goex FF, Goex FFF, Swiss 1 1/2F and Swiss FF......magnum and standard primers.....Spg lube....Starline brass.....and a variety of bullet designs from Lyman, Romano and Lee. I am a 22 yr. N-SSA member and am limited to using black powder for N-SSA competition. I was never able to get the groups off a rest or offhand that I needed. Despite all this testing, I am still a very strong supporter of the Armisport Spencer carbine. I sold a super accurate Henry rifle so I would not be distracted in this quest for 56-50 Spencer accuracy. We require a certain minimum level of accuracy for competitive offhand 50 yd. and 100 yd. shooting in the N-SSA. I believe Mr. R.A.Hoyt will build the "tack driver" 56-50 Spencer carbine that I am searching for by relining the barrel to my specs.
All this said.....I am not trying to say that anybody's Armisport Spencer has a problem. Each owner must decide that for him (or herself). I recommend them and hope everybody has good luck with them. I can only relate my own experiences in hopes that it might give others who need it more insight.
Thanks fellow SSS members for this forum! Hoot 3rd Ga Vol. Inf. N-SSA...Life NRA