300 PRC,

[BudT]

John, I know this is a old thread but wanted to weigh in on it to try and help you if I can. Are you still in the decision part of it, I don't want to wast your time on something you already are deep into. I do not shoot a .300 PRC nor do I see me into one but I do and have shot several of the .300 Magnums and have shot a 6.5 CM for several years. Let me know if you want. Take care old friend.
ButT

[fguffey]

If I understand your explanation above, it means a difference in case volume of .060 assuming the outside dimensions of the case are the same and the wall thickness is the same. It would also mean a difference in strength of the case in that area. Did you ever take the measurements on a new case and then check for any difference after firing it?

Did you have the opportunity improve the efficiency of the 300 Win Mag? That case had a very short neck. And then there was the 30 Gibbs with a shorter neck. today reloaders have an infatuation with neck tension, I have never got into that, all I want is bullet hold. I improved bullet hold on the 300 Win Mag and the 30 Gibbs. And I got all of that information from someone that got all of that information from someone else.

Meaning? None of us strutted around like we invented 'it'.

I am sure you have never heard of measure before and again after. I have literature from a famous gun smith/builder etc. in one of his articles he made mention of the subject with no more introduction than 'be aware'. it was easy to miss.

F. Guffey

[JohnMOhio]

With all that had been going on with my wife and her illness and then the bills coming in I was not able to get back and read the additional comments from the people I trust the most to give me "correct" info based on their experience. When we consider case capacity we have several things to keep in mind. Thickness of the case body. We can determine what the case thickness is at the neck by measurements. As for the body capacity, some go on amount of water years ago. Today, we can just fill it up with powder and see how much it will take to fill the case. If done this way, suggest it be done with a resized case with the spent primer still in the case. Other might weigh the case. I understand the long range shooters do this. However, even with the same lot of brass that is purchased, the composition of the brass can vary, especially if you were to order a 1,000 cases, same lot. When you consider case tension, a bolt gun could be .001 to .002. Semi-auto, .003 to .004 would be ideal. The .004 would be safer. Why, the semi-auto action striping off the round and placing the round in the chamber. Question, what would happen if the bullet worked it way free or was able to move forward. Could get into the lands and serve as a plugged bore and when the powder was ignited, increase pressure beyond what might be considered safe. I was told by my Uncle when I first started reloading, adjust your powder load anytime you change to a different primer and or cases and work up your load watching for over pressure signs.

[fguffey]

When you consider case tension,

I do not have neck tension, I do not have case tension. I have tension gages, to prove life is not fair; all of my tension gages measure in pounds and no one has a a way of converting pounds to tensions.

F. Guffey

[lyman]

With all that had been going on with my wife and her illness and then the bills coming in I was not able to get back and read the additional comments from the people I trust the most to give me "correct" info based on their experience. When we consider case capacity we have several things to keep in mind. Thickness of the case body. We can determine what the case thickness is at the neck by measurements. As for the body capacity, some go on amount of water years ago. Today, we can just fill it up with powder and see how much it will take to fill the case. If done this way, suggest it be done with a resized case with the spent primer still in the case. Other might weigh the case. I understand the long range shooters do this. However, even with the same lot of brass that is purchased, the composition of the brass can vary, especially if you were to order a 1,000 cases, same lot. When you consider case tension, a bolt gun could be .001 to .002. Semi-auto, .003 to .004 would be ideal. The .004 would be safer. Why, the semi-auto action striping off the round and placing the round in the chamber. Question, what would happen if the bullet worked it way free or was able to move forward. Could get into the lands and serve as a plugged bore and when the powder was ignited, increase pressure beyond what might be considered safe. I was told by my Uncle when I first started reloading, adjust your powder load anytime you change to a different primer and or cases and work up your load watching for over pressure signs.

I shot Service Rifle for years, and also shot Garand Matches,
never did I crimp a bullet in place, just simply seated them,


not had a bullet come loose, in 223 or 3006

[fguffey]

When you consider case tension,

I am not infatuated with tension, neck tension is the easy way to saying "I do not have a clue". I have a tension gage, it is marked off in pounds and no one has a conversion for tension to pounds.

F. Guffey