10-11-2011, 10:09 PM
The original 0.292" was a PPC rifle produced by Scott Medeshia and which required the necks to be turned to remove the doughnut from swaging up the neck. The 0.300 actually predates the 0.295" and follows a series of minor chamber experiments with conventional free bores and varying neck diameters.
The 0.300" was proposed once it was seen how the Mauser and subsequently Enfield throats worked ( at the time we were not aware of the Enfield pattern). The trick to accuracy is the centre the bullet in the bore and if the chamber is loose and the case small with a large projectile then hold the projectile not the case. The compound throat nips the bullet to centre while the larger neck diameter and length is more tolerant to misalignments.
We actually draw the 0.295" neck after the 0.300" and tested it fairly extensively. It provides no enhancement in accuracy, was picky on ammunition and was abandoned for this reason. No further development was undertaken so things like max case, min chamber were not worked out. It did not offer the possibility for future growth such as the steel case ammunition might bring.
Returning to the OP, Les Baer builds a superb rifle and while his chamber now differs, it is extremely accurate. I do not view this as anything more than a difference of opinion and given what he was trying to do makes a fair amount of sense.
Grendels did not demonstrate the problems seen with the clone chambers when the Hornady ammunition arrived, because it conformed to the given dimensions intended to fit the chamber. The chambers have not deviated from the original design at any time during production which now spans over six years.
The 0.300" was proposed once it was seen how the Mauser and subsequently Enfield throats worked ( at the time we were not aware of the Enfield pattern). The trick to accuracy is the centre the bullet in the bore and if the chamber is loose and the case small with a large projectile then hold the projectile not the case. The compound throat nips the bullet to centre while the larger neck diameter and length is more tolerant to misalignments.
We actually draw the 0.295" neck after the 0.300" and tested it fairly extensively. It provides no enhancement in accuracy, was picky on ammunition and was abandoned for this reason. No further development was undertaken so things like max case, min chamber were not worked out. It did not offer the possibility for future growth such as the steel case ammunition might bring.
Returning to the OP, Les Baer builds a superb rifle and while his chamber now differs, it is extremely accurate. I do not view this as anything more than a difference of opinion and given what he was trying to do makes a fair amount of sense.
Grendels did not demonstrate the problems seen with the clone chambers when the Hornady ammunition arrived, because it conformed to the given dimensions intended to fit the chamber. The chambers have not deviated from the original design at any time during production which now spans over six years.