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Post by deadon on Oct 30, 2010 10:14:52 GMT -5
Resulted in a 1" drop in POI with the 195 gr Barnes MZ FB and 54 grs of H 4198 at 100 yrds. Would not have thought it would have been that much, BUT that is why I shot this AM, Rusty
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Post by Al on Oct 30, 2010 10:50:31 GMT -5
Rusty, could the amount of clothes you had on have anything to do with the shift?
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Post by sw on Oct 30, 2010 10:59:46 GMT -5
I think that is a low pressure load. I've tried 58-63 when trying to see if I could get a single powder 45 load to equal a duplex. Of course, it didn't.
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Post by tar12 on Oct 30, 2010 11:46:44 GMT -5
I think that is a low pressure load. I've tried 58-63 when trying to see if I could get a single powder 45 load to equal a duplex. Of course, it didn't. Did you see any POI drop with temps swings with the duplex? and if so how much was the POI affected ? |
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Post by deadon on Oct 30, 2010 15:56:53 GMT -5
I think that is a low pressure load. I've tried 58-63 when trying to see if I could get a single powder 45 load to equal a duplex. Of course, it didn't. Low pressure load, is that a bad thing?Rusty |
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Post by deadon on Oct 30, 2010 16:01:19 GMT -5
Rusty, could the amount of clothes you had on have anything to do with the shift? No Sir, I don't see how it could. I held the same way across my bags as I always do. As a matter of fact, the extra clothes makes the stock a more perfect fit. In warm weather I use a folded up towel to make up the difference. Rusty |
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Post by Richard on Oct 30, 2010 16:19:53 GMT -5
Rusty..........No, not if you are happy with your results. I would almost guarantee if the load had some "pressure/velocity" to it, you would not see that. My high(er) pressures loads hit in the same spot summer or winter. Here again, shooting over a chronograph all the time, I can keep track of the velocity. Its not the temperature that makes the shot go higher or lower, its the velocity. The flatter your load shoots, the less you will see a POI change under slight velocity variations. Look at it this way>>>>>>If I have a load that is shooting 2800 fps in hot weather...........In cold weather it is shooting 2750 fps. At 100 yards, you will not notice a change in POI. But, a 2400 fps hot weather load shooting 2350 fps very well may see a change in POI due to the more "curved" trajectory. Maybe this explains it?  Bump that load up to 60 to 64 gr. and do the same test. If recoil becomes a factor, than simply adjust your POA for hot or cold weather. Actually, most deer will not know the 1" difference at 100 yards  Richard |
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Post by deadon on Oct 30, 2010 17:06:13 GMT -5
Rusty..........No, not if you are happy with your results. I would almost guarantee if the load had some "pressure/velocity" to it, you would not see that. My high(er) pressures loads hit in the same spot summer or winter. Here again, shooting over a chronograph all the time, I can keep track of the velocity. Its not the temperature that makes the shot go higher or lower, its the velocity. The flatter your load shoots, the less you will see a POI change under slight velocity variations. Look at it this way>>>>>>If I have a load that is shooting 2800 fps in hot weather...........In cold weather it is shooting 2750 fps. At 100 yards, you will not notice a change in POI. But, a 2400 fps hot weather load shooting 2350 fps very well may see a change in POI due to the more "curved" trajectory. Maybe this explains it? Bump that load up to 60 to 64 gr. and do the same test. If recoil becomes a factor, than simply adjust your POA for hot or cold weather. Actually, most deer will not know the 1" difference at 100 yards Richard Thank you Sir, I got it, makes a lot of sense  Rusty |
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Post by Chris Champion on Oct 31, 2010 15:38:17 GMT -5
Rusty,
I agree that if you bump that load up to 58g or higher you probably wont see much of a difference as the temps drop. 60g-63 or 64g even better.
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Post by spoonover on Oct 31, 2010 21:45:44 GMT -5
Lights up sights up, lights down sights down. Could the sun have been brighter?
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Post by pposey on Nov 2, 2010 8:02:21 GMT -5
30 degrees is alot of difference. but it's going to be a skinny deer you miss with 1 inch,
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Post by deadon on Nov 2, 2010 19:49:00 GMT -5
30 degrees is alot of difference. but it's going to be a skinny deer you miss with 1 inch, You are right My P BUT if you are tryin to shoot um between the eyes,it could make a difference Rusty |
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Post by deadon on Nov 2, 2010 19:55:31 GMT -5
Rusty, I agree that if you bump that load up to 58g or higher you probably wont see much of a difference as the temps drop. 60g-63 or 64g even better. Chris, I will try that again BUT next time I will try it with Fed 209 A primers on the advice of a VERY old member. OH !!!!Sorry Tar, Thanks for caring, Chris and Tar, Rusty |
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Post by pposey on Nov 3, 2010 7:50:37 GMT -5
Mag primer will help, a 30 degree difference could also effect the bedding of the action as well, just hafta shoot more under the same conditions to insure it is the powder
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Rusty
