Paper Patch question

[Kurt]

[Dave Roelle]

Well the sub 70 grain loads went down range yesterday--------Kurt, i found the cork (1/8) thick gasket material at the local Tractor supply--i used it to fill the space in the 60 and 62 grain loads.

Things were mixed till i got to 64 grains things started to tighten up.

65 GRAINS got MUCH BETTER---66 was ok and 68 showed signs of opening up.

Sooooo spent the day prepping cases, casting bullets and making lube cookies-----patching the bullets now and finishing loading the 65 grain cartridges for the next match.

Next match next saturday-------hope like heck its a bit cooler

Thanks for continuing the thread-----the pics of the wrapped slugs were super---------thanks Rick and Kurt

Dave

[Kurt]

Keep at it Dave.
One change at a time and you will get what your lookin for.

[Don McDowell]

Ditto on Orville's Little booklet, excellent read.

I patch just enough to leave about open spot about the size of a pencil eraser in the middle of the bullet, Patching with 16-1 the bullet will bump up too the top of the patch and I patch just below the ogive.

KW
The Lunger

Kenny, Don, Kurt, Bobw, anybody, would there be any way I could get a pic of the base of a patched bullet for future reference?

Late to the party but here ya go..

[Shadow 4]

Kurt, Don Thank you

[Dave Roelle]

Well, what an experience last weekend, shot our annual club championship match (two day shoot saturday and sunday)---weather conditions completely destroyed me on the first relay (turkey's). Chambered the first round----felt a bit tight but seated all the way--second sighter had to use an assist to chamber the round---third same scenario--hi berm shots and dirt diggers--WOW whats going on.

WEATHER WAS GOING ON !!!!!!!----we all felt the humidity, about 80% but that hadn't been a problem previously--except it was 77 degree's out with a 74 degree dew point-------------the patches just sucked water out of the air and grew in diameter almost a thousandth.

Chambered one at the bench , it required the pusher assist to seat ---pushed it out of the breech and the patch was wadded up halfway down the slug-----looked like a sock the shook down around your ankle.

The temps climbed a bit by the next relay, everthing chambered but required a "hard push" with my finger to get them fully seated-----shot an ugly "pattern" at the rams-------weather warmed a bit more and by the time we shot chickens and pigs things were near normal---(8 pigs died )

This is of course paper related, so i'm gonna dig around town for a different brand of paper and see if i can't skirt this humidity/dewpoint issue

Any one had a similar issue ????????

Perhaps "waterproofing" is needed

Thanks in advance for any feedback

Dave

[Kurt]

Dave it sounds like a fouling problem with the dirt diggers.
I shot in the rain last week with no problem chambering the rounds and I patch .001-002 overbore. Yes it is a snug fit but I wiped between shots.
I would check the case length consistency and neck tension, this will throw a lot of vertical.
A case to long will give you problems if the neck gets pulled forward into the throat if you have excess headspace. This will clamp tight onto the bullet as it releases from the case if your using any sort of crimp.

Kurt

[Dave Roelle]

Hi Kurt-----------thanks for the reply---------------dimensionally everything is as it should be, length within 0.01 of target length 0.004 short of the end of the chamber, finger tight seating just as originally set up--no crimp----wiping between shots------this lot of ammunition was "blueprinted" as a lot of 250 rounds just to make sure errors would be "shooter" and not ammunition if things went someplace they wern't directed to

i'll be digging around for different paper of the correct thickness (0.0017) and see if i can find some thats a bit more moisture resistant----------------when i tried wet wrapping with this paper it was really limp and stretchy, that and the barber towel atmosphere are what i "think" is going on.


The paper is stuff from hobby lobby --easy is get and the right size, "Masters Touch" and it was working and did work again when things dried out.

Again thanks for the reccomendations

Dave

[Kurt]

Dave, I might add. The compression of the powder mostly regulates the groups.
You will see this if you have more than one caliber. You can take a .45-2.1 and use say 68 grains of powder and say compress it .240" to get your accuracy load and anything above and below the groups open up. Now take a .45-2.4 or up to .45-2 7/8. and work up a ladder load to find an accuracy load you will find it pretty close with the same amount of compression if the bullet, primers, and wad stack is the same despite using more powder.
You can fine tune a load with the wad stack you use or primers. Keep the case volume consistent as well as the neck tension. Those two will do a lot keeping the vertical down.
I measure my case volume with something that is consistent in size like table salt or some of the fine ball powder. I do not weigh my cases because they might weigh the same but the inside volume will not be the same. And I anneal the case necks every third shot and trim the case.
It's the inconsistency of the brass or load/bullet that throws the monkey wrench in the hit/miss equation.


Kurt

[Kurt]

Southworth 700 CPL paper is .0017 thick. But it's hard to find. Maybe E-Bay or a old down town office supply. It was used for the carbon copy for the old manual typewriters.