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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Cold bore shot group vs Warm bore shot group
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<blockquote data-quote="James Jones" data-source="post: 168192" data-attributes="member: 8843"><p>I once had dealing with a tactical 308 that was custom built with a Hart barrel I believe , this gun would shoot the cold bore shot 1"high and 3/4" left every time , the following 4 shots would make a nice tight cluster around the 1/2" mark with Factory Federal ammo. We did roughly the same test you did , took it out 5 days in a row but we only fired one shot at the same target from the cold bore , the five day five shot group was just around 3/4". This gun would also throw out the first round from a clean barrel.</p><p> </p><p>So basicaly you might just have a quirky gun , or their maybe some contact in your barrel channel , your action screws could be in a bind , your action could be in a bind , all of the above things can cause trouble with first round fliers. No matter how great your stock is it will move as the temperature changes , so if your gun sits in the nice warm hose all day and night then gets put out into cold weather their might be some movement and the first shot settles the gun back to its "wanted" shooting position. Now remember by movement I'm talking very small , like in the thousandths..</p><p> </p><p>Just some things to consider , and I would suggest never shooting a spotter round when hunting , you should be able to call your first shot from a cold bore everytime , if not then their is some sort of problem , like mentioned above , or it could be you and not your gun or load , if your wearing a differant jacket , don't have the same cheek weld , the bi-pod could be preloaded for the first shot or vise versa , their are just to many variables in this test to make an accurate determination on the problem.</p></blockquote><p></p>
[QUOTE="James Jones, post: 168192, member: 8843"] I once had dealing with a tactical 308 that was custom built with a Hart barrel I believe , this gun would shoot the cold bore shot 1"high and 3/4" left every time , the following 4 shots would make a nice tight cluster around the 1/2" mark with Factory Federal ammo. We did roughly the same test you did , took it out 5 days in a row but we only fired one shot at the same target from the cold bore , the five day five shot group was just around 3/4". This gun would also throw out the first round from a clean barrel. So basicaly you might just have a quirky gun , or their maybe some contact in your barrel channel , your action screws could be in a bind , your action could be in a bind , all of the above things can cause trouble with first round fliers. No matter how great your stock is it will move as the temperature changes , so if your gun sits in the nice warm hose all day and night then gets put out into cold weather their might be some movement and the first shot settles the gun back to its "wanted" shooting position. Now remember by movement I'm talking very small , like in the thousandths.. Just some things to consider , and I would suggest never shooting a spotter round when hunting , you should be able to call your first shot from a cold bore everytime , if not then their is some sort of problem , like mentioned above , or it could be you and not your gun or load , if your wearing a differant jacket , don't have the same cheek weld , the bi-pod could be preloaded for the first shot or vise versa , their are just to many variables in this test to make an accurate determination on the problem. [/QUOTE]
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Cold bore shot group vs Warm bore shot group
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