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Are these tumbling? 225 gr Hornady BTHP's in 300 WM

 
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  #8  
Old 05-13-2013, 06:30 PM
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Re: Are these tumbling? 225 gr Hornady BTHP's in 300 WM

Is it possible you were not completely square to the target? I know its a long shot but maybe.
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Old 05-13-2013, 06:37 PM
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Re: Are these tumbling? 225 gr Hornady BTHP's in 300 WM

You increased both temperature and altitude, each which make the air less dense and thereby increases stability. The reason I put in 20F and 0ft initially is that is a pretty tough case for stability with cold dense air. Like what we have in the midwest in winter.... Here we have to be careful developing loads in summer which may not work out at all in winter...
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Old 05-13-2013, 06:43 PM
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Re: Are these tumbling? 225 gr Hornady BTHP's in 300 WM

Quote:
Originally Posted by westcliffe01 View Post
You increased both temperature and altitude, each which make the air less dense and thereby increases stability. The reason I put in 20F and 0ft initially is that is a pretty tough case for stability with cold dense air. Like what we have in the midwest in winter.... Here we have to be careful developing loads in summer which may not work out at all in winter...

Ah, I see what you were getting at. So even under very tough conditions this bullet should be stabilizing in this barrel. 8000' and 70 degrees were the actual conditions so it should have been even easier to get the bullet stable.

Impact holes are oriented different from each other and they would have impacted at least 3 feet apart. Seems odd given the group from the 150's.

Are there any other variables to consider?
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  #11  
Old 05-13-2013, 06:59 PM
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Re: Are these tumbling? 225 gr Hornady BTHP's in 300 WM

You are positive that you were not hitting low and having the bullet ricochet up at the target ? You don't mention the shooting distance, but I would expect a 225 to hit lower than a 150 at short range simply due to the time of flight being longer and it would therefore be dropping more. Whats the difference in MV ? Should be at least 300fps right ? At long range the 225 would retain a lot more energy and would end up going faster than a 150 and thus would actually drop less at the end.
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Old 05-13-2013, 07:08 PM
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Re: Are these tumbling? 225 gr Hornady BTHP's in 300 WM

I suppose it's possible they were hitting the dirt, but there was only the one dust cloud on the first shot. I suppose I should shoot a group at 25 and 50 just to double check. These were fired at 100 yards.
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  #13  
Old 05-13-2013, 07:41 PM
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Re: Are these tumbling? 225 gr Hornady BTHP's in 300 WM

It looks like the 225 would take 28% longer to get to the target at 100yds compared to the 150. That is a difference of 27msec (95msec for the 150 and 122msec for the 225).

From a perfectly horizontal barrel, using Newtons law S=1/2*G*t^2
The 150 will drop 44.2mm and the 225 will drop 73mm.

So a difference of less than 30mm or about 1.5" So that does not sound like your issue.
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  #14  
Old 05-13-2013, 08:07 PM
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Re: Are these tumbling? 225 gr Hornady BTHP's in 300 WM

This may sound out there but I had a target look similar. I was shooting a 45-70. I had printed the targets off my printer at home on standard thin copy paper. The cardboard I has stapled to had been shot out pretty good. When the bullet went through the paper it would get some tearing and it looked like it was keyholeing but the paper was thin and it was actually tearing around the bullet hole. I can't tell if you printed your own target or not or the condition of the cardboard backing. I hope this helps you.
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