doublegunshop.com - home Forums General Discussion DoubleGun BBS @ doublegunshop.com Leading and chromed bores

I do have some Remingtons, Jon. I may try the same load in a few to see what they will hold. I also have some RIOs and Fiocchis.

Gil, I have some of the mylar wrap left over from 10 ga. shorties years ago. I'd just have to trim it to fit. Thing is, it would take up nearly the same amount of space as the petals on a wad does, maybe a tad less, as it's pretty thin. Good point about the imprinting on the upper part of the petals.

Thanks, guys. SRH

Shot cup petals should "Never" extend beyond the shot, better to be a bit shy. When the petals extend beyond he shot they are encased in the fold of the crimp, whether roll or pie. This presents a very real possibility of the wad being retarded before the crimp can open. There is then a distinct possibility of Max camber pressures being increased, perhaps to a dangerous level. There is a very good reason wad makers keep their petals a bit shorter than for the intended shot load they are designed for. I didn't dream this up, it came from a ballistician in a ballistics lab, just don't at present recall the lab.

On specialty loads that I use where the shot wouldn't normally reach the top of the cup, felt and or cork spacers are placed in the bottom of the wads to raise the shot level. These are ballistic laboratory tested loads and are well within SAAMI pressure limits.

Chrome is hard and protective to steel from oxidizing. It is not necessarily smooth, unless specifically made so. Most industrial Chrome is matte in finish. My experience is that a well polished steel bore leads less than an as plated chrome bore.

I have to openly admit that what you say makes absolutely no sense to me at all.

AND even tho I've a limited reloading experience with only about 500,000 behind me, I've not seen a wad that would allow even a modest length of petal in the crimp that could actually be crimped and look like something one would want to put in a gun. I've loaded maybe 200K 24gm loads in 28gm shotcups and have never seen or felt or whatever any indication of high pressure and those were close to max or max loads to start with.

If you'd care to pay for it I can supply you with any number of similar loads for pressure testing.

I notice that several responders have mentioned mylar shot wraps. Decades ago I worked in a life-test lab, mostly doing work on electric motors. We used mylar to test the abrasion resistance of the steel shafts in the motors. With the slightest bit of anything between the mylar and the steel, the shaft would get chewed to pieces. I don't put mylar in my barrels.

The risk of the use of mylar increasing the likelihood of scratching barrels is pretty remote. The risk of barrels being scratched by what the mylar wrap is attempting to isolate, steel or solid tungsten shot, is far greater. Mylar has been an accepted component in preventing harder-than-lead shot breaking through soft plastic cups. I have yet to see evidence of scoring or scratching while using mylar. Gil

Frankly Wonko, I do not care if this makes any sense to you or not. As I said when I posted it I didn't think it up, it was stated by a well known ballistian who worked in the lab of a major US ammunition maker. Good enough for me & it made perfect sense.

The petals on most 28 gram wads are short enough to contain a 24 gram shot load so you likely have never even encountered the problem anyway

This was written primarily for those who shoot very light shot charges in a wad designed for a heavier load in their desire for "Low" pressure, such as 3/4 oz in a 1 or 1 1/8 oz shotcup.
If the shot does not fill the cup then a filler needs to be placed beneath it rather than allowing the cup petals to protrude beyond the shot.

I appreciate the reminder, Miller. But, I will probably never be one who tries to load too little in a shell. I'm often on the other end, trying to get one last little bit of performance out of one.

I never even knew there was a WW loading of 3/4 oz. for a .410 until KYJon clued me in a few weeks ago. But, it is an awesome load .........patterns beautifully on my plate out of my Dickinson, and smashes clays farther than I would have ever dreamed of with a 67 gauge.

I can't wait until next dove season. https://www.timeanddate.com/countdown/ge...mp;font=cursive

SRH

Im with Wonko. Aint no way a long wad would do anything significant to pressure. You can crimp a shell then glue it shut and the worst thing that will happen is you might lose a piece of the crimp fold. Loaded hundreds of rds using large wads with reduced shot and filler on top of wad. Worst case, the filler on top blows the pattern, but skeet birds never seem to care.