Armory Sponsor
Posted: 3/22/2010 5:04:56 PM EDT
Just a quick range report. Finally after about 700rnds or so thru the gun, I might be getting close. About 1700fps for the 850gr bullet in the bigger group ( .800" x .800"), and the small group should be about 2200fps .(500" x .700") with the same 850gr cast slug . Now, to revisit slower powders that I have tried earlier, for a bit more speed. Would like to hit 2,500fps, but I can live with 2,200fps. Groups are at 100yds. Range too muddy to get out farther.
|
Here is a pic of the moulds and the bullet. It was designed by yours truly and I had a company in SLC ( Night owl ent.) make a run of them. Think I had 16 total made. I cast from WW'w for the lighter load and 1/1 ww/lino water quenched for the heavier loads. I had the bullets lubed with Lars Carnuba Red lube and covered in a moly coating for the fast load, but not the slower one, but don't like to use a lube heater, so will try a 50/50 blend of Lars lube and Lyman super moly. Soft enough to use without a lube heater. Bullets sized to .513". Also use an "M" die to flare case mouths to help seat the cast bullets without damage. Understand that these loads appear safe in my gun, but your gun may be totally different and your loading experience my be totally different from mine, so I can't endorse these loads as safe in any other gun , but mine. The use of fillers is OK by one person, and will be condemned by the next, as hazardous to your gun, due to overpressure and/or "ringing" of the chamber along with other consequences. Load data is given to show what I use and is given for entertainment purposes, not a recomendation by any means. If you decide to use this, you do so at your own risk, and you accept the consequences of your actions. Pick up a copy of the latest "Handloader" magazine and look at the article on "Trailboss" powder. Its what got me thinking about the same powder in the 50bmg. So I started low, about 30gr and worked my way up. Showed some promise at around 60gr, so worked my way slowly up the charge weight. Aware that about 82gr is max load, by the "Handloader" article, I was careful. Made it to 75gr and got the above group and called it quits. Probably running somewhere around 95% load density. I understand that "Trailboss" doesn't like to be compressed and does funny things with the pressure curve. Went to 80gr. with some lighter bullets, but they were only OK, as they didn't have the nose bearing surface of the 850gr, but thats what I expected. The smaller group is at max. for MY gun, using IMR4895 powder. I loaded 125gr then a 1.5" square of Kleenex (TP probably OK too) in top of the powder, then GRITS (yup, breakfast stuff) on top of the Kleenex, to about 1/3 of the way up the neck, so that when you seat the bullet, you compress the grits. Kind of like loading Black Powder rounds, you DON'T want ANY airspace in the column. I understand that it can cause guns to come apart. Top of the Gas Check is just at the shoulder/neck junction. Tried 130gr of 4895, but got sticky bolt handle lift and groups were opening up to around 3". Will back off 5 grains once the weather warms up and see what happens, as the 125gr load might prove to be too hot for warm weather. Will report later in the year if I can get to 2,500fps or close to it, with good accuracy. Accuracy with the AMAX was EASY, compared to this!! Figured it could shoot cast, just finding what it liked was another story. imtheflash––-only had 5 rounds loaded––two over the chrony––three left for target. |
|
Quoted: imtheflash––-only had 5 rounds loaded––two over the chrony––three left for target. I shoot for accuracy through my chono. The draw back for me is I turn the magnification down so i can see the sky screens, and don't shoot them. Good work on your load development. |
Armory Sponsor