About bore capacity?I'm not tracking what you are trying to say here Bart
That's my concept on what under and over bore capacity means for different cartridges. Based on when accuracy degrades some standard amount.
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About bore capacity?I'm not tracking what you are trying to say here Bart
Bore capacity is a concept foreign to me...is this something you came up with? Are you saying that a 22-250 with 24 grains of powder is baseline for barrel life, and doubling it to 48grns reduces barrel life to just 25% of the baseline?About bore capacity?
That's my concept on what under and over bore capacity means for different cartridges. Based on when accuracy degrades some standard amount.
My laptop, I don't remember where it was before it was there.Where did that come from Edd?
That's my spreadsheet developed years ago based on data from Sierra Bullets and top ranked competitive shooters.Look at this.......
The 1000m yard shooters used to seat each bullet in the rifle, the bolt held the back and the lands held the bullet the same each time. that was back in the 70's . I don't know how they do it now but the record 10 shot 1000 yard group at that time was around 3 inches, and that is good enough for me to this day ! What they did was barely size the end of the neck, just enough to hold the bullet, then seat each bullet when they pushed the round into the chamber, then they would shoot it. It was very accurate in the 70's and held the world record at Bodines Original 1000 yard Benchrest club, North of Williamsport PATHIS... AND to back up what he said, if you don't skim turn and square up the necks to true them, I don't feel either method has any effect on accuracy whatsoever as long as they are sized properly. In fact, there is a faction that believes if you don't prep your brass you are actually better off using small base dies and completely sizing cases back to nearly new factory dimensions. They feel this allows the case to self align in the chamber somewhat, like a factory round. For our purposes (a long range precision rifle) I feel very strongly every round of brass should be fully prepped and sorted. Great loads cannot be either consistent, or duplicated without this step. Leave this step out and you will always be chasing your tail for accuracy. You can find a load that shoots the magic 1/4" group. Go home and load up a bunch and the next group just may be 1-1/4". Doesn't take long to turn, trim and chamfur the necks, ream the flash holes and primer pockets on 100 cases. Doesn't take long to sort them by weight either. I don't sort them until they have been fully prepped.
So how does it do at predicting barrel life?That's my spreadsheet developed years ago based on data from Sierra Bullets and top ranked competitive shooters.
Forum member mikecr updated it with powder heat index data linked below
https://www.6mmbr.com/BlogSept2005.html
Very good, according to top ranked competitive shooters and others who use good conditions and standards.So how does it do at predicting barrel life?
The Earth used to be flat...The 1000m yard shooters used to seat each bullet in the rifle, the bolt held the back and the lands held the bullet the same each time. that was back in the 70's . I don't know how they do it now but the record 10 shot 1000 yard group at that time was around 3 inches, and that is good enough for me to this day ! What they did was barely size the end of the neck, just enough to hold the bullet, then seat each bullet when they pushed the round into the chamber, then they would shoot it. It was very accurate in the 70's and held the world record at Bodines Original 1000 yard Benchrest club, North of Williamsport PA
There's thousands of folks in The Flat Earth Society who are not convinced the earth is round.The Earth used to be flat...
Now it is not