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Super vs Sub POI
#7210387
06/28/18 12:45 AM
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Joined: Apr 2017
Posts: 3
rack04
OP
Green Horn
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OP
Green Horn
Joined: Apr 2017
Posts: 3 |
My 300 blackout pistol is sighted in at 50 yards using S&B FMJ 200 Grain ammo. I'm interested to take it into a tree stand tomorrow using Barnes VOR-TX TAC-TX 120 Grain ammo to take a hog at 30 yards. Is there a free ballistic calculator that will compare the POI between two types of ammo and output what the compensation should be?
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Re: Super vs Sub POI
[Re: rack04]
#7210413
06/28/18 01:23 AM
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Joined: Dec 2008
Posts: 41,171
J.G.
THF Celebrity
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THF Celebrity
Joined: Dec 2008
Posts: 41,171 |
You have to verify zero, on paper with supers. Then verify zero on paper with subs. A ballistic calculator can only do so much. It has to be shot for real to know.
Plus there is a thing called "first round pop", and hopefully I am explaining it correctly. A barrel, and more importantly a suppressor, full of baffles and void space are full of air. Air is 21% oxygen, oxygen is a necessary component of fire. The first round fired can land somewhere completely different from each subsequent shot, often higher. Because of more oxygen available, means more muzzle velocity. First round pop happens with my suppressor, and shot number 1 does shift from the rest, but it is slight. I'm only talking supers here. If I load a sub, on in an unshot barrel, the first round pop point of impact shift is more pronounced.
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Re: Super vs Sub POI
[Re: rack04]
#7210552
06/28/18 04:20 AM
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Joined: Aug 2011
Posts: 6,179
Tactical Cowboy
THF Trophy Hunter
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THF Trophy Hunter
Joined: Aug 2011
Posts: 6,179 |
30 yards? Just earhole em with the subs.
The secret to a long life is to try not to shorten it.
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Re: Super vs Sub POI
[Re: rack04]
#7210745
06/28/18 02:07 PM
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Joined: Sep 2009
Posts: 18,946
ChadTRG42
THF Celebrity
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THF Celebrity
Joined: Sep 2009
Posts: 18,946 |
You will certainly have a POI shift between those 2 types of ammo. Not only will your trajectory be different, but you will have to shoot them both to know what POI shift you get. No one can answer this for you until you shot and tested it.
What I can tell you is, if you are sighted in with the subs, the 120 grain super sonic ammo will impact high. How much higher I can't tell you until you shot it. But it will be enough to miss a pig.
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