I recently acquired a Baikal MP 153 3.5" semi auto shotgun at a price I couldn't turn down. The MP 153 is gas operated and shoots all three standard 12ga. shell lengths, and weighs and feels much like the Rem. 11-87. Instead of having the action spring in the buttstock, like the 11-87, the action spring is over the magazine tube. <br> <br> The gas system has a heavy spring in the barrel ring that slips over the magazine tube. The spring tension can be adjusted for best functioning with a variety of shells, by controlling the amount of gas used to power the gun's ejection/reloading system, with the use of a spanner/choke tube wrench on a threaded adjusting ring. As set from the factory the gun should function with 2 3/4" lead to 3.5" steel shells. If the adjusting ring is screwed in (up to two turns) it will direct more gas into the system and will handle the lighter lead loads. If screwed out (up to two turns from the factory setting) it will bleed off more gas and handle heavy lead turkey loads.<br> <br> The instructions suggest firing 100 heavy lead shells to break the gun in. I found if I turned the adjusting ring in two turns, my 1 1/8 oz. lead Win. Superfield loads would function properly, even though the gun was not broken in. After firing 150 rounds of lead shot, and adjusting the ring back to the factory setting, the gun was broken in, and would cycle 1 oz. 1350 fps. lead loads properly.<br> <br> However, I found that for proper ejection of my 3.5" steel handloads, I had to set the ring for the lead turkey loads. This is likely due to my using approximately 40 grains of Steel powder in my relatively light charge weight steel shot loads, and creating more bolt speed from the ignition of them than the standard 1 9/16 oz. factory steel shot loads that use only about 31 grains of powder. This "lead shot turkey load" setting of the adjusting ring may be appropriate for the 1 3/8 oz. 3.5" fast steel factory loads as well.<br> <br> I also discovered that the Remington hulls I was using varied by about .060" of an inch. Most of them were approximately 3.440" long, while a few were a full 3.5" long. The gun ejected the slightly shorter fired hulls more vigorously, indicating that mouths of the longer hulls were dragging on the ejection port. This variation in hull length is common with Rem. hulls, but I will trim back all mine to the more commonly encountered 3.440" length which ejects more vigorously.<br> <br> The first pic. is of the shotgun itself. The fiber optic sight and sling swivels were added later. I fired several shots with a variety of handloads I use from three chokes, the factory full "steel", a Trulock Improved Modified (similar in performance to a Briley), and a .675" Terror. The barrel required the removal of about .010" to allow the Trulock and Terror to seat on the internal choke shelf. The aftermarket chokes were seating on the muzzle, rather than the internal choke shelf (as they should), and the metal was removed with a file to allow the chokes to seat on the shelf and not on the muzzle. Shotgun muzzles are rarely square with the bore. This is not a problem if the choke used is flush with the muzzle or has some clearance between the muzzle and choke shoulder. If it does not have some clearance, some needs to be provided. Careful filing of the muzzle, along with checking with a precision machinist's square and dial caliper is easily accomplished, but should be done either by a gunsmith or machinist.<br> <br> The first three pattern pics. are at 40 yards with a 3" 1 1/16 oz. handload of 2's. This load patterns very similarly to the Kent 1 1/8 oz. 3" fast steel load, so it is likely the same results would be obtained. I fired other loads using bigger shot and will obtain some Kent shells from Big Mexican for patterning as well. Bowhunter57 provided the Trulock IM choke, and many thanks to him for loaning it to me. While the factory full steel choke (a modified choke for lead) patterned lead shot well, but it was consistently beaten with the #2 fast steel loads I have fired so far by the Trulock, and in particular, the Terror choke. The factory full steel fared better with the BBB steel shot.<br> <br> The first pic is of the shotgun, the second is of the pattern fired with the factory full steel, the third is of the pattern fired with the Terror and the fourth is of the pattern fired with the Trulock IM.<br> <br> I will post pics. of the 1 3/16 oz. load of 1's and 1 3/16 oz. of BBB's after I get them marked.<br>