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Post by mtj555 on Sept 4, 2011 11:52:45 GMT -5
I know some are curious to actual velocity readings of the bad bull. I went back to the range today and shot it through the chrono. approx 10-12 feet from muzzle. 3 shots. 3115fps, 3100fps and 3070 fps. This was shot with 140 grains weighed IMR 4350 and 275 Parker BE. about 45fps spread. If only I could find a consistant way to seat using the same pressure I am sure it would be less of a spread. I didn't seat it hard, one handed. Recoil isn't as bad as people think it is.
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Post by mtj555 on Sept 4, 2011 11:54:50 GMT -5
here is a picture of 3 shot group at 300. best shot group so far. Normal is about 1.5inch for me. This shot group was just over a inch. looks like 2 shots but 2 bullets went through same hole almost although you cant tell by picture. before windage MOA adjustments
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Post by mtj555 on Sept 4, 2011 12:00:42 GMT -5
made Windage Adjustments today. Didn't have time during Friday range session. After adjustments. I made 1 shot at 410 and hit the bullseye. of the shot groups I have shot at 410, it is usually around 3.5 inches.. zeroed at 100, I come up 4 MOA for 300 yards and 9 MOA for 410. I emailed parker and they said BC of the 275 Parker, people are using 250. Using that number with my ballistic information, Ballistic program came up with 3.8 MOA for 300 yard group and 6.8MOA for 400 yards. I think 250 might be a little high BC, its probably lower.. Has anyone figured out the BC of the 275. Next time I go to the range. I will try to shoot through chrono at 100 and 200 and see what the velocity readings are to figure out the BC I am getting.
Mike
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Post by mtj555 on Sept 4, 2011 12:05:10 GMT -5
1 shot at 410. even I get lucky ;D Seriously this gun is a shooter, of course this is all done off the bench. When 180inch deer walks out at 100 yards I will probably miss....
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Post by Deleted on Sept 4, 2011 12:12:18 GMT -5
Thats awesome shooting, I'm kinda confused . Your real life shooting you went 9moa to shoot 400 or 410. Then your calculations suggested only a 6.8 moa adjustment was needed for a 400 yd shot. I don't get it  ? |
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Post by Dave W on Sept 4, 2011 12:36:03 GMT -5
Great shooting!
I think Bills buddy came up with .210 for a BC using the velocity loss method, chronied at 400yds and what other distances I am not sure. Maybe Bill could comment.
Over on Modern Chuck came up with .224, timed at the muzzle and 100yds.
I think Deadeye uses .275 but he goes by bullet drop I believe.
I think I came up with close to .243 using the trajectory chart on BB's site and plugging those numbers into JBM.
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Post by mtj555 on Sept 4, 2011 12:40:57 GMT -5
that was based off the ballistic program. When I emailed Bob parker asking him what the ballistic coefficient of the 275 parker it seemed like he didn't know. He simply replied that most people were using 250. Seems like he didn't have the BC of the 275,just told me what some people were using. He did mention for me to check out his 300 and 325 match which had BC in the 4's. Anyone want to chime in with what they found out to the BC of the Parker 275. The ballistic program said for me to come up 6.8 MOA but I had to come up 9 to get on at 410. It would suggest to me that the BC of the 275 Parker is not 250.
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Post by Deleted on Sept 4, 2011 13:01:32 GMT -5
Exactly what I'm saying... Deadeye and Rkrobson were shooting
600 yds with the 325's/327s. I guess they felt the 275's weren't heavy enough and in turn their BC's were not up to that long of a shot.
I guess they think that after 400yd or so the 275 runs out of gas
,but in your case you have a little more gas to give it,lol.
The new 300 match hunter is uncharted territory so far,but it won't be after it cools some and people are able to go out and shoot.
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Post by mtj555 on Sept 4, 2011 13:15:22 GMT -5
I would like to try the 300 or the 325 at some point. I talked with Roger to see if he had any load data yet for the bad bull and he hasn't had time to shoot them yet. He told me I could send him the bullets and he would size them for me. He told me I would have to shoot it slower. If I decide to shoot it, I will find out what he recommends as far as charge goes. The last thing I want is a buldged barrel. I am complety satisfied with the 275 Parkers. I would love to see what my muzzleloader would do with the 300 or 325.
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Post by Deleted on Sept 5, 2011 12:42:39 GMT -5
I'm thinking a 800yd gun or more. Since these other guys are shooting submoa at 600ydswith the 325.and they are shooting alot slower than what you are capable of.
You might want to invest in a smooth form die from Swinglock so you can size your own bullets. That die and the full-form die that Tom makes out of a barrel drop from your barrel have been the latest technology jump in sabotless shooting .
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Post by mtj555 on Sept 5, 2011 15:30:30 GMT -5
Yeah, looking forward to trying the 325's and 300's at a later date. I wont try them until after this deer season when I will have some time. I hope to try the 300 or 325 before I deploy this coming year. As far as the sizing die that Swinglock makes it would be nice to have one but I dont want to cut part of my barrel off to make it. I wonder if he can make one for me if I slug my barrel and send him it.
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Post by Richard on Sept 5, 2011 15:38:58 GMT -5
NO! The barrel drop is incorporated int the die.
Richard
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Post by mtj555 on Sept 5, 2011 16:11:44 GMT -5
Doesn't he make the die from part of the barrel blank from your barrel. I guess I was mistaken. I will send him a PM
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Post by Deleted on Sept 5, 2011 16:26:49 GMT -5
If you have a 2inch piece of your barrel that was cut off,then he uses that part to make an adjustable full form die that sizes and cuts the rifling in a bullet that is put through it.
If you don't have the drop you can't get a full form die and thats that. The other alternative is the adjustable smooth form die that
resizes only. Guys here have been getting great results just using the smooth one so all is not lost if you don't have a barrel drop and you don't want to chop off some of your barrel.
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Post by edge on Sept 6, 2011 8:41:58 GMT -5
Very impressive!
Just wondering out loud......
I would imagine that a 22 twist barrel made by say PacNor or Shilen, or any other barrel maker would probably be the same within a tenth or so of all of their own barrels!
If that is true, then you could probably request a drop from almost any barrel that they make and use it as a drop for your barrel.
To be extra sure, you might ask for a barrel drop from a very tight or even un-lapped barrel. A barrel that its not lapped would have the widest and deepest lands and if your was lapped a bullet should work with only modest adjustment depending on barrel type.
edge.
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Post by Deleted on Sept 6, 2011 22:17:12 GMT -5
Following your thought Edge, would you want a barrel cutoff rifled with a fresh button or one that has cut 50 barrels or so?
I've got mixed feelings about that situation.
A barrel thats cut with a used button is going to be tighter,another paradoxial situation......,omg.
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Post by Jon on Sept 7, 2011 5:41:56 GMT -5
Edge you make good sinse the ff die I had done was from a drop from my barrel but as it turns out my barrel is slightly tighter at the muzzle. I'm still waiting on brass then I will know more.
Jon
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