velocity and rpm of pp acww

[TREERAT]

how fast can a pp acww bullet go before rpm stresses the lead to much?

if you had a 1 in 12 twist .35 cal, is it possible to pp acww to 2,600 fps? which should be 156,000 rpm if my figures are correct.

what about the same with a hp, would the rpm screw up the bullet.

[Digital Dan]

Probably that would depend upon the alloy. A hard cast patched bullet can probably run on up to near 3000 fps without coming unhinged. I've seen very soft alloys make it thru 1800 fps and I've seen 'em fail before that. Lots of variables involved but I think alloy is the biggest issue.

[rhead]

I use 50-50 pure lead and wheel weights in my paper patched hornet loads. 55 grain bator over 12.8 grains of lil gun. I was going for accuracy not velocity. The book value says it should be around 2650 to 2750. Accuracy leveled off at about the same I could get from factory loads so I quit stressing the brass.

[pdawg_shooter]

I have taken a 18 BHN 30cal just over 3000fps from a RUM with right at 1 moa. Pure lead works to about 2200. WW, AC, work to about 2500, 2550fps or so.

[357maximum]

Far too much thinking goes on with regards to RPM. If you can do it with a j-word...there is a way to do it with a PP boolit. JUST HAVE TO BE WILLING TO PUT SOME TIME IN, and throw some preconceived eternally perpetuated "TRUTH" out the window. I have had bare greased boolits doing what you inquire about ACCURATELY in a custom 11 twist 35whelen in a rem 700 that was old enough to be stamped 35/06. In that instance I was running a light for cal (200gr) boolit over a slow(ish) for cal powder...and a tough mallable 50/50WD alloy...it is possible.


I doubt that HP is just going to balloon out into an ashtray in midflight either...but I have not tried...you are on your own here.



If you are gonna swing ...swing for the fence...do not let the NAYSAYERS/THINKERS/SCIENTISTS hold you back. It is amazing what one can do when they do not know they cannot. JMNSHO

[redneckdan]

Work done with varmint weight bullets in ultra fast twist .224 barrels indicates that bullets usually come apart from the base forward, so probably the HP shouldn't be a weakness with regards to RPM. I recently aquired a 200gr .452 hollow point mould designed for the .45 acp. I'm tempted to see what I can accomplish with it in the .45-70 Should make for some explosive varminting results.[smilie=1:

[pdawg_shooter]

RPM affects a bare cast bullet by deforming it in the barrel by acceleration. When supported by paper you can achieve much higher velocity with accuracy. A BHN of 18 will handle 3000fps, no problem.