![]() While workhorse field or duty guns are typically better off in 5.56 NATO, for those looking for a potentially more accurate, precision AR-15 platform without swapping to a 6.5CM or. 223 Remington and 5.56 NATO as well as special loads with longer bullets, going into the 80-grain range. This provides a chamber with very tight tolerances that allows the use of both. 223 Wylde is in the sweet spot between the minor differences in the two chambers’ freebore diameter/throat dimension, and leade angle – while using tighter headspacing than in 5.56 NATO military chambers. To split the middle ground between the two variances. 2260 diameter freebore with a 0.59-inch freebore length and a 1 (ish) degree throat angle.īoth chambers use the same minimum headspace “GO” gauge that is 1.4636-inches while the 5.56 NATO has a deeper maximum depth. ![]() The extremely similar 5.56×45 NATO chamber has a. 2240 diameter leade/freebore with a freebore length of 0.25-inches and a 3-degree (ish) throat angle. Best First Focal Plane (FFP) Scopes for 2022.
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