2zero6 wrote:I wonder if Remington will be using the same brass.
I seem to recall reading somewhere that Remington was using Small Rifle Bench Rest primers in their version.
Siringo wrote: I have always trimmed my cases after expanding. I have just finished prepping 284 cases. After firing the first time, I reamed them to .452. Sizing yielded an ID of .444" -- same as you got. Expanding opening the ID to .448". The pilot on my case trimmer measures .446" -- same as yours.
Guess you could always chuck the pilot in a drill and take it down a little if you want to trim w/o expanding.
Ah, I didn't expand them yet. Was going to trim them, de-burr and uniform the flash holes, tumble them again and then expand them just before actually dropping my loads. The trim cutter pilot starts in about .25" then seizes as the walls thicken further in.
Update: I measured a dozen random ones and all are actually at or slightly shorter than the trim length in a cool room. I'll caliper the remaining ones but I suspect they will all be too short to need trimming, so the trim cutter pilot sticking was a moot point. I wonder if the lack of growth is a result of the fellow I got them from having a slightly short chamber, or this particular caliber just doesn't grow that much using factory loads.
[quote="Siringo"] My flash hole uniforming tool measures .080 and slips into the 450B holes with just a little effort. I would say that they are right at .080.]/quote]
Mine is .082 and would not go in though it felt and looked like with a small effort, it would. I just didn't want to screw up the
formula they use, as I'm sure any deviation has its impact upon results. Looking through the stereo microscope, it appears that in the brass I have, the burred edges on the inside of the flash holes have been smashed back against the web in an expanded pattern like flower petals, so I'm not sure deburring will accomplish anything positive. Nevertheless, I will at least uniform them to .082. The .284 Winchester uses Large Rifle Primers. Now I'd bet a dollar to a donut that affects the
formula.
The fellow who gave me the brass promised a box with a hundred of them in it, mixed with some .308s, .300 WUMs and a few 30-378 Weatherby to boot. First time I ever saw 30-378 Weatherby and OMG, they're monsters. I bet they kick you into next week! There wound up being 164) 450B total. Should keep me going for quite some time. Any way, I'll inspect them more closely as I uniform the flash holes and see how many are out of round. In the last bag of 100) new .260 Remington brass I bought, there were 6 that were out of round enough to throw in the scrap bucket.
Thanks to everyone for the reality check.
Hoot