Freebore at end of chamber is not considered by many to be best for accuracy- the rifling should just touch bullet or just slightest of interference fit is what many benchrest shooters prefer. Problem is what happens when a larger,longer bullet is used? Freebore allows heaviest bullets to be used, slight reduction in pressure for shorter bullets and slight chew of bullet after its short jump to engage rifling. Ruger mini30 supossed to have a bit of freebore on its .308 barrel- allows the use of other than american ammo using .310/311 bullets safely. The old .300 H&H long taper was designed by engineers worried about possible fouling in chamber causing feed problems while hunting sometimes dangerous game- reliability was important. Cordite mix of nitrocellulose, Nitroglycerin and petroleum gel was hot, reliable burner but still had corrosive fouling properties especially with corrosive mercuric primers of the time. Since head spacing on shoulder wasn"t a problem with the "flanged" cartridge the extra forward chamber space was not concern, the extra space was a plus on extracting fired shell after brass returned closer to original diameter, Blish principal retention of case in chamber not wanted. As for overbore? Maybe, best balanced cartridge in .30 may have been the old .300 Savage. RN
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Today's Featured Article - Weldin Basics, Part 3 - by Curtis von Fange. Oxy-acetylene Welding - Part One In our series on welding we have taken a brief look at AC and DC arc welding along with basic techniques and safety equipment required for safe usage. Since our premise is to cover welding types that might best be used on a farm environment we have kept our overview purposefully simple and general. The second type of welding that this observer finds quite useful in
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