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On another forum an enterprising fella is selling 'magnetite sand'. Seems it's very heavy, and some are jumping on it, but I wonder about BR rules w/regard to magnetic or ferrous sand. Is it allowed in competition? Would it be allowed if someone also had ferrous or magnetic devices for weight...

I use opticsplanet to order through Leupold's custom shop. This way I know it didn't just come off a line, but was actually looked at by a human. http://www.opticsplanet.net/custom-leupold-mark-4-8-5-25x50mm-lr-t-m1-rifle-scope.html I've ordered several Mk4s through them, without issue. They...

It doesn't hurt to go big initially for ruling out much of it, espescially with a magazine fed gun, or with VLDs. Everything I shoot is either single shot or I make it so, and 50thou off is as far as I've ever gone. With mine, a helluvalot happens in 25thou, plenty in 5thou, and then as much...

For two varmint cartridges I currently reload for(223 & 6br), I ended up 8thou and 15thou off as best, which doesn't really mean anything for you I guess. I arrived at this with what amounts to a ladder test for seating, starting at 5thou off and working in 5thou increments outward(using a...

I would cull out a handful of 308 cases with high thickness variance, and neck turn trial & error for settings that produce a good thickness after downsizing. If you turn up onto the neck shoulder a bit & with downsizing, there won't be any doughnut. You can also leave your false shoulder for...

Given springback variance w/thickness variance, I don't understand the percieved advantage to collet neck sizing, over bushing downsizing followed by expansion. There are more options with bushings and expanders, imo.

This isn't calculating CG offset, which cannot be calculated or predicted(unless put there in a test), but must be measured. Your posted formula is for dispersion caused by CG offset, once known.

The link/formula I posted above includes Ix/Iy ratio. Henry Childs tested(into destable) PB BR bullets - vs- LR BR bullet's specifically in this regard. His conclusion was that PB BR bullets could get by with considerably lower Sg than LR BR bullets, -because of this ratio. This supports Bryans...

This is the real formula: http://www.nennstiel-ruprecht.de/bullfly/gyrocond.htm From RL McCoy But this ain't no rule of thumb. It requires bullet dissection to determine some of the parameters.

It's because stability is not directly tied to RPM's. So any RPM based stability rule of thumb fails tests. In fact, the Miller rule of thumb will fail tests now & then, as it too defines limited senarios..

Your loaded neck at (.253 - .224)/2 = 14.5thou thickness in the necks Your fired neck at .252 = 1.5thou springback from a .2535 chamber Your .249 bushing is producing .249 + 0.0015 = .2505 necks, or .2505-(0.0145x2)-224 = 2.5thou interference('tension') You already have 1thou...

Savage 22-250s are 12tw Could have bought a Savage for heavier bullets...

Why did you buy them in 14tw? Did you plan to rebarrel in 12tw or tighter? The 14tw trend is a result of group shooting expectations -by hunters. This twist forces lighter shorter/flat base bullets ahead of faster powders, producing smaller 100yd groups. Problem solved... You can always shoot...

Bob, if I understand correctly, Pacecil is suggesting that runout is a non-issue because the neck relaeases the bullet to it's fate, before the bullet moves. Once free from the neck caused misalignment, other factors might come into play. But two big questions I have: 1. Has anyone demonstrated...

I would believe there would be an issue anywhere the brass yields(beyond springback) to leave an interference fit on chamber springback. I haven't tested extreme loose tolerances, but have tested extreme tight tolerances. And as long as pressures allow the chamber to contain brass from...

Harris swivel bipod

Thanks for the info guys

What in your experience can be expected of 6PPC accurate barrel life at your loads. I'm talkin a general sense like -when the damn thing just won't shoot like it had before. Thanks

There is no just right crush 'by feel'. You cannot feel 2thou or 3, or 4 of crush +/- 0thou... I can only assume that you haven't used your K&M -per design. I'm sure 20 minutes of correct use with one, followed by comparison measurements with any other, would have cleared your mind of it's...

German you mentioned in your small primer study "All primers were seated with the Sinclair tool which has proven to be the best tool for this purpose".. Can you you provide a basis for this? I would like to have seen the test done at the same primer crush and with firing pin strikes adjusted...