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Post by Deleted on May 21, 2015 21:53:12 GMT -5
Got a chance to shoot some of the .458 335 APBs tonight. Running low on daylight, I got some powder ready and decided to get it sighted in at 100 yards and do a BC test. I forgot to plug in the Magnetospeed on the first shot. The first 3 shots made a ~.400" group, and the fourth shot that I needed for velocity opened up the group to ~ 1" or so..... D'OH! Savage T/A 31" .458 Brux 1-17" twist IMR4831 335 APB 3049, 3073 and 3058 fps for an average of 3060 fps, and an ES of 24 QL says...45,854 psi with this load Since I blew the 100 yard group by shooting a fourth shot for velocity, I had to shoot a 500 yard group to try to redeem myself a little. The barrel was very warm when I shot this group. I'll try it later with a little cooler barrel.  I had the gun sighted in at 100 yards to check the BC of the 335 APBs. JBM said with BC at .454, the bullets should be 43.8" low at 500 yards. I'd have to say it's pretty close... With this being the first 2 groups I've shot with the gun, I'm really liking the 335 APB!  |
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Post by lwh723 on May 21, 2015 22:10:48 GMT -5
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Post by Deleted on May 22, 2015 0:19:02 GMT -5
Very impressive! Nice shooting!
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Post by joe1379 on May 22, 2015 0:21:39 GMT -5
d**n you Luke. d**n you Earnhardt! There goes another hundred bucks and change. Now I have to order some of those to try. Lol. Good shooting. Wish I had a longer range around where I live. You would think Topeka Kansas would have some long ranges ! Looks like those will be the king of BC for smokeless ML.
Joe
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Post by Deleted on May 22, 2015 4:03:28 GMT -5
I will send some down range as soon as I get my new scope? looks like a winner already.....
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Post by 7mmfreak on May 22, 2015 6:14:34 GMT -5
Looking pretty good.
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Post by schunter on May 22, 2015 7:17:44 GMT -5
Mighty fine right there...
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Post by edge on May 22, 2015 7:25:36 GMT -5
Sounds like a nice load for women and kids just starting out, at least if you want them to never shoot again  That should put down just about anything you run into, nice shooting. edge. |
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Post by Deleted on May 22, 2015 11:03:28 GMT -5
Load testing and bullet tightness testing... 335 APBs with 130 to 135 grains of IMR4831 The barrel shot great from hammer down tight to 1-2 hands of loading pressure. Once I sized the bullets 1-hand light loading pressure the groups opened up... 1-2 hands it is... All 100 yard groups  |
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Post by Deleted on May 22, 2015 11:10:37 GMT -5
I was going to ask how the loading pressure was? I have some 310 APB (4) and the spring back is weird and it loads well 2+ hand loading per say and when it gets closer to powder it's real hard hammer down. I don't want to be hammering down so I need to figure out a little looser loading size.
Good report very informative!
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Post by edge on May 22, 2015 11:41:15 GMT -5
Just curious, were they sized specifically as you shot them or did you:
Load and decide that felt like a 2 hander and so shot at the 2 hand target,
Then load again and decide that felt loose so shot at loose target?
edge.
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Post by jims on May 22, 2015 11:45:19 GMT -5
Earnhardt: That first group with the tape is 4 inches, good. The last one shows 45 inches on the tape, pretty big. Actually good shooting especially with new bullets.
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Post by cowhunter on May 22, 2015 11:46:33 GMT -5
Good shooting. Using an electronic bathroom scale, how many pounds of loading pressure would you estimate "1-2 hands" to be?
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Post by Deleted on May 22, 2015 12:19:07 GMT -5
Just curious, were they sized specifically as you shot them or did you: Load and decide that felt like a 2 hander and so shot at the 2 hand target, Then load again and decide that felt loose so shot at loose target? edge. I actually when "backwards " on these tests. On a new barrel I normally start out with very loose bullets and slow work my way up to tight sizing. Since I had the sizing already figured out for the 310 APBs, I started with that sizing and it happened to be very tight for whatever reason. (barrel crud, etc...) With every new bullet type and load combo, I do this type of testing. Shoot a range of bullet tightness, and see how it effects accuracy and bullet placement. The 2 shot group in the upper right I should have just pumped another one in there. But I've been doing a bunch of stuff around the house, and just went to the next load. I'll normally shoot 4-5, 3 shot groups to see how the accuracy is effected with variable bullet tightness. FOR ME, my barrels have always shot best from 1-2 hand to tight. Less variance in ignition, bullet resistance, which affects velocity and grouping, as well as gas blow by where gases get around the bullet before it fully swells to fill and seal the barrel. With fast powders bullet sizing is not as critical as it is with slower powders. Because the ignition and powder burn is instantaneous, and much more rapid/violent in a load of 70 grains of 4198 vs. 135 grains of 4831. As for 1-2 hands of loading pressure....it truly is relative. I'd have to put a scale on it. |
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Post by airborneike on May 22, 2015 12:23:52 GMT -5
Josh,
Good shooting and good report. How was the wind?
How thick are the jackets on those bullets?
The barrel is a shooter, no doubt. Your "table manners" have improved too :-)
Mike
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Post by Deleted on May 22, 2015 12:44:57 GMT -5
Josh, Good shooting and good report. How was the wind? How thick are the jackets on those bullets? The barrel is a shooter, no doubt. Your "table manners" have improved too :-) Mike The center, upper rt...no wind. Lower rt ~ 3-5 mph cross. Lower left ~ 5 mph cross. The 500 yard group the flag was hanging...perfect for BC testing The jackets are .028" thick I believe. The barrel is definitely a shooter...thanks to you! My table manners have improved because of your help and 7mmfreak's...Thanks again Mike! I'm ready to get serious and start shooting for groups! |
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Post by Deleted on May 22, 2015 13:58:56 GMT -5
335 gn bullet @ 3000+fps....Wow...amazing,accurate, and brutal all wrapped up into one...where's it going to end....great shooting by the way...
Zen
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Post by Richard on May 22, 2015 16:15:29 GMT -5
Nice shooting Earnhardt! Wish we had a place locally to play at longer than 300 yrds.
Richard
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Post by Deleted on May 22, 2015 19:48:47 GMT -5
that's a Hammer load for sure, anything that walks swims or crawls would be toast for sure.
Its plenty accurate as well.. good shooting Josh...
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Post by Deleted on May 22, 2015 20:35:59 GMT -5
that's a Hammer load for sure, anything that walks swims or crawls would be toast for sure.
Its plenty accurate as well.. good shooting Josh...
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Post by Richard on May 22, 2015 20:47:56 GMT -5
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Post by Deleted on May 22, 2015 21:17:07 GMT -5
Groups 2 & 3.. in a light wind... I didn't shoot with the Magnetospeed on, so no velocities...guessing 3050 or so. Group 2 I'm aiming at a target that is ~44" above the groups. My gun is sighted in at 100 yards and I'm checking bullet drop and BC...fairly consistent... Light S-SW wind I tried to time the shots with the 400 yard flag, but it didn't work out so well. You can see how even a light wind will cause a bullet to move laterally as well as vertically with a tail wind that is blowing up hill... The groups with the "1" on them I shot last night. I tightened the Swing Lock full form die up 1/2 notch on this group.  On group 3, the wind switched a little to S-SE. I aimed about 1/2 MOA or 2 1/2" to the right of center thinking it would blow it a little more back to the left and drop it into the other groups. WRONG! The horizontal is pretty good with the 3 bullets in group 3 lining up pretty good, but I shouldn't have moved the crosshairs over so much, since apparently I was timing the shots decent... I tightened the Swing Lock die up another 1/2 notch. 2 of the bullets were not effected, but the third one was since it fit very tight and needed some persuasion with a mallet to get down the barrel. It shows since it jumped up the target quite a bit, do to the increase in velocity from the bullet being a lot tighter. I'm right on the threshold when the rifling wants to biter into the bullet walls size it is sized larger. I'll back the Swing Lock FF die of a little and try some more groups with the Magnetospeed on, to see if and how much it effects the groups with this load.  |
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Post by jims on May 22, 2015 22:02:45 GMT -5
Interesting how the sizing affects things.
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Post by Deleted on May 22, 2015 23:09:16 GMT -5
So I was thinking in my way home from work about full forming. When I full formed the 310AP bullet I got spring back that made the bullet kinda look like a mushroom on the base side. Which then means I have to run threw a second time which I really don't want too unless I have too. Lining them back up with rifling is a pain.
So my question is if you heated the bullets up some with a torch would you not get the spring back as bad?
I'll need to order some more 310AP bullets soon to get it out though.
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Post by Jon on May 23, 2015 2:56:38 GMT -5
watching with great interest. Good read.
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Post by Deleted on May 23, 2015 6:33:02 GMT -5
when full forming I always run them through the die 3 times, with practice its very doable and repeatable and it pretty much eliminates tight bullets. with one pass they are very inconsistent for me..
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Post by edge on May 23, 2015 7:13:10 GMT -5
So my question is if you heated the bullets up some with a torch would you not get the spring back as bad? IMO, you would not be able to heat a jacketed lead bullet up enough to make a difference. I think that the lead would certainly melt before you reached annealing temperature needed for copper and if you were not careful the aluminum tip too. edge. |
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Post by squeeze on May 23, 2015 8:13:49 GMT -5
Is it the longer heavier bullets go straight farther? like the long range BlackPowder guys all sling a ~7-900grn huge lead pipe, and just lob it in at slower speeds?
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Post by rambler on May 23, 2015 8:26:57 GMT -5
At 7mmfreak's advice I put a little scribe mark on my push rod so it always sits in the same place on the ram then a scribe mark at the top where the bullet sits. I then put a scribe mark on the bullet itself and have a reference for each pass thru.
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Post by al53 on May 23, 2015 8:37:13 GMT -5
real nice shooting....seems the tight and 1-2 handers shoot the best....you can't ask for any better than that....
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