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Hi, this is a trial projectile for : accuracy improvement, part of the problem was eccentric movement of the centre of gravity of shot in the bore. Trials showed by slight adjustments of the C of G. and centering the shot a substantial improvement of accuracy was acquired. A Mark.2 APDS projectile design was therefore embarked upon - an m.d of 6in. at 1,000 yds. was their objective. Trials with the Mk.2 showed improved performance against space plate targets. NB. The shot stamped 17 pdr. is the scarcer of the two markings. The absence of red band could indicate no trace as this might complicate the evaluations, recall its a trials projectile and each shot would have been marked on the projectile, yours is 27 l think? Cheers, RonB.
l have to say this, its not strange, the same projectile is used in both cases. First a 17pdr. APDS round issued & marked 17 pdr APDS lBT. Few months later a 77mm. APDS round issued & marked 17 pdr & 77mm. APDS lBT. From then on both calibres (once old projectile stocks exhausted) bor the later markings - this took place in 1944. The 77mm. APDS rd. was a superb loading - very accurate and still near good as the higher velocity 17 pdr rd. re. penetration. Hope this is of help. Cheers mate, Ron.
No doubt your correct the assembled projectile and other components - case, primer & propellant would be sent onto a filling factory say Kirby? Lancs for final assembly and boxed. so l agree with you. Cheers, good luck, RonB. PS. Am sure you know or can workout why the 77 was 75mm.?
