The 20" barrel is the heavy barrel and the 22" is the lighter sporter contour.  I would suggest getting the 22" barrel for a light carry hunting rifle.  Shoot it in the 22" configuration to verify it is a shooter and then cut it to your desired length.  I use a Omega 300 DTM on mine @ 22" with no issues.  I use the factory bottom metal and mags with mine (2 ing 6.5 Grendel, 1 in 6 ARC, 1 in 22 ARC, and 3 in 223) with 0 issues.  I have a Stockys VG on my 6mm ARC and a Bell and Carlson M40 Howa Mini Action stock on a 223 and on my 22 ARC.  The rest are in factory configuration.  I like the B&C stock better than the Stockys VG.  My 22 ARC and my 223 in the B&C stocks are probably my favorite to shoot.  I highly recommend the B&C stock for the Howa's for the price and shoot ability of them.
Jay
	
	
		
			
			
				
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