Actually I'm the one that put the word "accuracy" in this thread. I stated "Heck of a lot easier to find accurate loads with pc'd bullets compared to their traditionally lubed/sized counterparts."
Generic statements like this "I have seen loads with higher ES shoot better than ones with low ES" really don't mean much. Es's don't mean much with pistol loads @ 50ft. Take that same high es load from the 50ft line out to 200yds for rams and you'll be back to the drawing board in a hurry. Same thing with rifle loads @ 100yds compared to 600yds.
The topic of this thread, using the same loads/bullets/firearm, the coated bullets had less sd's & es's than their traditional cast/lubed/sized counterparts. Hence my statement "Heck of a lot easier to find accurate loads with pc'd bullets compared to their traditionally lubed/sized counterparts."
I've showed this picture before, several years ago was having a discussion about the compression of the lube grooves. A member here sent me this picture. If you look at the lube grooves you will see that they are/have compressed compared to the unfired bullets at the top of the rows.
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The watered down version with traditional cast/lubed/sized bullets:
You hit the loud button "BANG" the bullets off to the races. Hot gasses push against the base of the bullet expanding it to seal the cylinders/chambers/bbl.'s. The hot gasses also compress the lube groove/grooves pushing the lube outward and forward. Some of the hot gasses get by the bullet's base/bottom drive band. Those hot gases pressurize the lube pushing it outward & forward sealing the bbl/bullet contact. Get the alloy too hard for the load and bad things happen. Same with the wrong lube, too much lube, too little lube. Get the alloy correct for the pressure of the load & use a lube compatible with the loads pressure and you get accuracy. If not you get flame cutting, poor seal, leading loss of accuracy.
The watered down version for cast/coated/sized bullets:
You hit the loud button "BANG" the bullets off to the races. The coating acts like traditional lube sealing the bbl/bullet. All's you have to do is make sure the alloy is soft enough to expand/seal the cylinders/chambers/bbl.'s. This shows up with a chronograph with lower sd's/es's and higher velocities. If you do a search you will find it's extremely common for people to post they get higher velocities with there coated bullets compared to their traditionally cast/lubed bullets.
A 10-shot group @ 50yds with a traditional cast/lubed/sized bullet in a 308w with a gc.
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Same bullet cast at the same time from the same pot as the bullets tested above, the difference is no gc and coated.
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The big difference between the 2. With gc is 60fps+ slower than the same bullet without the gc and has been coated.
Years ago I bought a beater 629, nothing more than a truck gun. Shot it a lot over the years and figured it would be as good a choice as any firearm to use for testing traditional lubed vs pc'd. Cast 5 different bullets & lubed/sized 1/2 of them. The other 1/2 I pc'd and ran thru the same push thru sizer that I used on the traditionally lubed bullets. Took 7 different powders and did ladder tests with the lubed & pc'd bullets. Was looking for 6-shot groups @ 25yds that were 1 1/2" or less. At the end of the day using the same firearm/same shooter/same bullets cast from the same alloy/same powder, dies, reloading press/etc. The pc'd bullets flat out smoked the traditionally cast/lubed/sized bullets. It was 13 loads with pc'd bullets vs 3 loads with the traditionally lubed bullets that would do 1 1/2" or less @ 25yds with 6-shot.
13 vs 3
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Like I said generic statements like "I have seen loads with higher ES shoot better than ones with low ES" really don't mean much. All's they do is create more generic questions like is that normal for "all" loads? Is it better to have loads with low es's or high es's? What tests did you do to come up with such a generic statement?