Show us Benchrest results that support your spread input. Like what ever ones you have been basing your input from. The Cactus attachment is all computed to a "Spread" column for you to see, with all spreads of 5X and greater highlighted.I said "most" or "some" or "up to".....
Show me where I specifically said "all groups" without any other bandwidth.
Probably like shooting a 10 shot ZERO. OOPS It's been done.Donovan I don't remember in all my years at 1000 yard Benchrest ever seen a ten X target!
Joe Salt
Probably like shooting a 10 shot ZERO. OOPS It's been done.
Do you know what a 10 shot ZERO IS ? IF The diameter of the bullet is 243, the target has to measure 342 or LOWER to be a ZEROI shot a ten shot zero once at 1000 but it was 7" out of the scoring with about 30 mph wind. HA HA
Joe Salt
I'm not sure anyone fully understands bullet seating depth and its impact on group size. Here's what I do know and/or believe:
1) a single 5 shot group is not going to produce repeatable "group shapes". It's just not.
2) bullet dispersion is largely governed by in bore tipping of the projectile. (This much, we know is fact). This is what I believe seating depth impacts. I will admit I don't have a strong explanation as to how, and neither do I have any evidence that seating depth impacts in bore tipping, but it seems to be the most likely culprit. The other would be barrel exit timing, but the math on that is suspect. My current hand wavy hypothesis is that bullets are released asymmetrically to to case wall asymmetry and will oscillate (tip back and forth) slightly as they move towards the rifling. Once they hit the lands, they stick and that's the amount of tipping you wind up with. Certain seating depths will allow the bullet to hit the lands straighter than others due to the timing of the oscillations. Note: I made all of that up and have NO evidence that that is what actually happens.
3) It is plausible that there is a gravity dependent "orientation" to the tipping.
4) Barrel muzzle movement is not purely up/down or side/side or any clean orderly geometric shape. It's wonky. That's a scientific term for "catywompus".
5) I think a lot of load development "techniques" are really just different ways of shooting a bunch of groups and picking the best ones. Some are more orderly and logical than others. But there's a whole lot that don't make any sense at all, and yet still work, just because people keep shooting until they find their tune.
Personally, this is one of the great mysteries of internal ballistics - the question "why does seating depth have such a pronounced impact on group size"?
And score the jacket unevenly which will destabilize itBullet Tipping: Traveling down the bore is the final bullet swagging operation??? The bore might straighten out the wobble???
The World record group at 100 yards is held by Mac McMillan.
Stinnetts target was smaller, they asked for Mac's but Kelly declined for a remeasure. it would not count anyway, Macs that is.
Oh. Then you perhaps might have asserted, just as confidently, say "up to a 20x spread." Heck, occasionally someone misses a backer entirely. "Up to an infinite spread"? How can you ever be wrong?For those who don't understand, or realize, or comprehend that "up to a 6X spread" includes a 1.001 X spread and all other increments of any multiple up to and including a 6.000 X spread, I cannot help you grasp reality.
Oh. Then you perhaps might have asserted, just as confidently, say "up to a 20x spread." Heck, occasionally someone misses a backer entirely. "Up to an infinite spread"? How can you ever be wrong?
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Good to know, thanks. But, what does the distribution curve between 1.001x and 10x look like?I've seen some competitors get 10x spread and more. he had that one covered.
Never really thought about it. Ive never heard of anybody looking at the spreads of the bottom half of the lineup until now. Its gotta be a nice looking curve though.Good to know, thanks. But, what does the distribution curve between 1.001x and 10x look like?
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Do you know what a 10 shot ZERO IS ? IF The diameter of the bullet is 243, the target has to measure 342 or LOWER to be a ZERO
Got ItHey Cat if you look at the end of my sentence it says HA HA Get It!
But like Donovan said average your groups.
Joe Salt