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So-called "Light" loads are not necessarily low-pressure. LC SMITH IDEAL GRADE 12 GAUGE COMPLETED RH LOCK PLATE. Appears IC and IM, I dont have tools for a 20 or a 28. 70mm chambers, scary French tripple proof. No box or papers, no cast, nice wood and dimensions. Low-pressure shells are almost as hard to find as 2 1/2 shells. 20 gauge, unfired, grease dried up and stuck, 2 3/4' chambers, R10. Chambers are 2 3/4' and the gun weights 6 lbs. Smith 12 ga hammer gun Left lock plate assembly. LOP is 14 1/8', DAC is 1 3/8 and DAH is 2'. LC Smith Precision Hunter 20 Gauge Turkey Choke Tube Trulock Md: PHLC20583 Exit. It has auto ejectors and Hunter One single trigger. Smith Specialty grade 20 gauge shotgun has 28' barrels that are choked Imp.Mod/Imp.Mod and have excellent bores. lc smith model field grade double barrel shotgun 12ga c&r 26 inch ' barrel mechanicsville, va 23116: used: : 805.00 : field hunter arms lc smith 20 gauge 28 split right chamber double triggers c&r 050018 28 inch ' barrel reno, nv 89511: used: : 899.00 : 12 gauge hunter arms fulton ny lc smith field grade gau side-by-side. He also concluded that lengthening the forcing cones was almost as effective in reducing pressures as lengthening the chamber. Smith Specialty Grade 20 Gauge Double Barrel Shotgun Description: This L.C. His conclusion was that selecting low-pressure shells is more important than selecting shells of the right length. However, he found that most modern shells produce pressures much higher than what older guns were designed for, regardless of what chamber length they were fired in. Kel-Tec, Kimber, Knights Manufacturing Company, Knights Armament, Krag-Jorgensen, Kriss, L. He found that a short chamber does increase pressures, but not enough to matter. The author actually took a short-chambered barrel and fired both short and long shells, measuring the pressure accurately, then lengthened the forcing cone and chamber in stages and repeated the test several times. There was an article in The Double Gun Journal a year or so ago that explored the oft-repeated warning that it is not safe to shoot 2 3/4 shells in 2 1/2 chambers, because it causes very high pressures.