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300 RUM, 200 AccuBond + Retumbo Results:

 
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Old 08-21-2003, 08:12 PM
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Re: 300 RUM, 200 AccuBond + Retumbo Results:

Thanks, guys.

I should have known you'd say that, Darryl. [img]images/icons/wink.gif[/img] Now that you did I'm a bit PO'd at myself. While I didn't include any Matchkings in this test, I have tested the 240 before in the same medium and I really should have included some pics. I'll try to take some (without a digital camera that means I'll have to wait until the whole roll is shot up before they can be developed). One word of warning, while they performed very well as far as the wound channel goes, what was left of the bullets isn't much to look at. But my box of 240's was on standby if these failed to shoot--I came very close after the poor results with H870.

Jerry, yeah the temps were in the 95 degree range during all this testing. I'm sure that didn't help. But that's another vote for Retumbo that it did so well in the heat.

I do think most of the plastic tipped bullets have underrated BC's (including Nosler's Ballistic tips) but as far as I can tell this bullet is spot on or very close to .588. It matched my charts out to 700 very well correcting for weather/altitude as well as I could. Trajectory at only 700 isn't a very accurate way to measure BC's but that's all I've got.

Remember the length of the bullet has little to do with BC's--but weight has a great deal to do with it. If you beleive their advertised numbers, the AB has a more aerodynamic, efficient shape than the 220 SMK. But the SMK has a 20 grain weight advantage which makes it harder to slow down for the same drag force.
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Old 08-22-2003, 10:33 PM
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Re: 300 RUM, 200 AccuBond + Retumbo Results:

Jon, still curious what you fired these bullets into? Maybe you stated that and we missed it. I recovered some 7mm 160 Accubonds yesterday that I fired into a cardboard box filled with dry newspaper. I shot 2 at 250 yards, 2 at 400 yards and 2 at 500 yards. They were all fired from the prone position using my Kramer snipepod. The 2 at 250 were 1.15" apart. The 2 at 400 were 2.64" apart and the 2 at 500 were 5.8" apart. The bullets looked very much like the ones you recovered. Retained weight ranged from 96 to 98 grains for an average of 60.6%. They look very much like a partition would look. I think they will be an awesome big game bullet. Rufous.
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Old 08-27-2003, 01:26 AM
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Re: 300 RUM, 200 AccuBond + Retumbo Results:

I took some more pics:


That's pretty self-explanitory.




Here you go, Darryl! [img]images/icons/wink.gif[/img] I've included a 240 SMK in the lineup that I tested earlier in the same medium. It retained 41% of its weight counting the jacket and core together (they were found in one piece but the core is free to fall out). All of them I recovered looked pretty much the same--expanded down all the way to their bases. I also tested the 180 XBT and Scirocco at the same time. While the recovered MK may not be as photogenic, its penetration equaled the XBT, was better than the Scirocco--and the wound channel was huge, easily the biggest of the three.
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Old 08-27-2003, 02:52 AM
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Re: 300 RUM, 200 AccuBond + Retumbo Results:

Jon,

Must have missed your post on this over here. Your Accubond in the pic you just posted looks like the one I took out of the Mooses shoulder I got last week, 133gr retained wt.

I shot the 90gr Retumbo load some more today, 1.3" 3 shot group at 200 yards off the bipod and a crappy rear rest. You should have seen my off hand group tho, I'd of had you all rollin on the ground laughin. [img]images/icons/wink.gif[/img] Ain't no wonder why I missed on the first shot now! Holy smokes, what a reality check!! Kept 4 out of 5 on a 9.5"x11" piece of paper and dropped one about 8" below the bottom edge. I was done when Shawn showed up with the AR-50 though. Put a few M33 balls through the Oehlers at 2745 fps and drilled some deep holes! [img]images/icons/grin.gif[/img] Man they shoot sweet... Took Shawn a few rounds to get settled in, but after I put three into an inch at 200 yards he sure tightened his groups up trying to catch up. [img]images/icons/grin.gif[/img] [img]images/icons/grin.gif[/img] Muzzle brake works better than I thought tho, sky screens and diffusers didn't even twitch at just ten feet from the muzzle, I don't think I've even seen that happen before. [img]images/icons/smile.gif[/img]
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Old 08-27-2003, 08:46 AM
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Re: 300 RUM, 200 AccuBond + Retumbo Results:

Jon,
Interested to hear what you are shooting the bullets into, very uniform performance. I have seen similar mushrooms when we shoot into water.
ian
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  #13  
Old 08-27-2003, 02:53 PM
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Re: 300 RUM, 200 AccuBond + Retumbo Results:

Ian,

Jon said it was dry cottonwood.

Here's the recovered 200gr Accubond from the Moose. Went in and breaking the shoulder, passed through busting two ribs and stopped on the outside edge of the other shoulder just missing the shoulder bone on the off side. Weighed 133gr in the end.





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Old 08-27-2003, 09:16 PM
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Re: 300 RUM, 200 AccuBond + Retumbo Results:

Sorry, Ian, I guess I posted that in the thread at "the other place." [img]images/icons/wink.gif[/img]

The penetration tests were into wood (dry cottonwood). It isn't quite as hard on bullets as water or solid flesh. I have found this to work well over the years since you can fire a round at full muzzle velocity into it and the resulting bullet looks much like one recovered from game at 2-300 yds.

BTW, I liked your bonded bullets article.

[ 08-27-2003: Message edited by: Jon A ]
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