Latest acquisitions.. Yeah, this hurt the toy fund

Care to break down what you have there?

just one... in the early 80's a friend and I were shooting IHMSA metallic silhouette, and trying to get more knockdown out of the TC Contender 14" pistols with cast bullets... we necked a 30-30 down to 7mm , 8 degree body taper and 45 degree shoulder (Clymer made the reamer, Redding the dies)... it preceded the 7 Rimmed International by several months but got no recognition... called it the 7 RMS for rimmed Mickewicz, Snyder... there are only 3 barrels chambered for it... one of the cartridges is on the board at the test facility at Eglin AFB

adapter on left was to mount the sight of my M1A on the gas block

Nice!  I'll second the breakdown request.

ETA: sorted

Top
11.35 madsen
7.62x24 subcal tracer
7.92x24.5 subcal
7.65x38 swiss machine pistol  

Bottom
23x152 inert - HE  red w/link    
23x115  - HE
20x99r inert - SHVAK russian AP
13x64b mg131  HE    
13x64b mg131 AP      
15x96 mg151      - HE  
15x96 mg151      - API  
20x82 mg151      blue inc      
20x82  mg151     yellow HE    
20x82 mg151       API  
20x110rb inert - German HE
20x113 live - black/blue
20x120 madsen  
20x139 inert - HEI/SD DM 1A1
20x138b inert - 20h 42 va - 2cm kpf.z.45 fuzed projectile - brown (originally yellow?) - possible tracer band
20x138b inert - P 36 - wood bullet
20x110 inert - KE 5679 case Sweden - Dutch NWM MN12 break up projectile
1" nordenfeldt
13.2x99 Hotchkiss Tracer        
12.7x81sr inert - Italian HEI fused - BPD 41 S