Re: 200gr Accubond comparison test of sort
I'll email you the vidio of the first shot there.
The expansion up close pushing the nose all the way back and leaving a descent shank length below indicates to "me" it will work at most any range well. Beyond what range it leaves something to be desired is yet to be determined. Up close it should work great still. If it would have held 70% weight up close like that, I'd be using a more fragile bullet at closer to 1000 yards for sure but all looks well so far.
Don't hold your breath for the 2,3,4,5,6,7,8,900 and 1000 yard water test... it may take me some time to get all set up for it yet. I'll be testing other bullets types at the same time too, so it should be very interesting to say the least. I'd like to make a setup that I could stick cardboard or poster board baffles across the container at 6" increments to see just what's happening in the "wound channel" and how far the bullet and it's fragments each penitrate. This could require a fiberglass lined wooden box with retainers siliconed in place... could take some time but, I already have the glass and wood to make it up.
I didn't mention it above but, all those loads were using Fed 215M primers too. It also bears repeating that the OAL is real long too!! Any reduction in OAL and pressure could climb, and in my experience it would climb substantially if reduced to merely 3.66", maybe by as much as 5 to 10 kpsi so be carefull with the data provided here. I'll test it at a shorter OAL of 3.66" as soon as I can and let you all know what happened.
Bolt lift was absolutely normal on all loads tested but, it usually is up to about 70-75 kpsi though. These were FL sized cases with minimal shoulder bump, NK sized cases may have shown stiffness signs a bit sooner, but not very much sooner... in my experience.
Slight primer cratering was all I could make out, that was only "felt" on the top load of each RL22, 4350 and RL25 (lot # 25180). By sliding (rubbing) the tip of your index finger across the caseheads, you can feel a snag if there is any "edge" to the crater in the primer. The sensitivety in your fingertip will pick the raised edge up instantly if it exists, and more often than not it shows up just before stiff bolt lift starts to occur, this is with the 210 and 215 primers in "most" of my rifles anyway.
I mark all the case heads and primers completely with a black marker before doing load work up. The amount of black wiped off after they're fired and extracted indicates how much bolt thrust is rising "relatively" and shows a clear ejector mark if present. Prior ejector marks or "protrusions" will show up "shiny" on a lower load and give a false indication if not indexed to the ejection port side before firing so a new one will be made over the ejector plunger.
I did get a slight "showing" of brass color under the ejector with the top load for RL22 and 4350, barely more so than the color showing on the rest of the casehead from the thrust itself. PSI was just starting to get high enough to exibit this but, it would have been unnoticable without first marking the casehead black.