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Rifles, Reloading, Optics, Equipment
Reloading
.243 AI Loading Question
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<blockquote data-quote="westcliffe01" data-source="post: 790549" data-attributes="member: 35183"><p>Your problem is primarily going to be with VLD's. "ordinary" bullets should be less of a problem. But you need to get the throat question sorted out. Having an excessively long throat is the same thing as having a shot out barrel.</p><p></p><p>What your options are depend a lot on your barrel tennon ? Is yours a Remington type action, or a savage style ?</p><p></p><p>The only way to fix the throat, if it is as long as you say, is to have the barrel set back. It is a question of how much. I believe that the AI chamber I have has a Sami style neck and throat, that is probably the way most 243 AI's are made. The only time one expects anything different is for a custom job where someone wants to shoot 115's and specifically requests a lengthened throat.</p><p></p><p>The throat dimension could very well preclude you shooting lighter bullets accurately and may be part of the current problem too.</p><p></p><p>I would be having a word with the rifle builder to see what they were thinking putting a long throat on a 1:9 twist barrel which cannot shoot the heavy and long VLD's in the first place. On the 115's a 7.5 twist is generally recommended.</p><p></p><p>If possible send back the rifle and have them set back the barrel and give you a regular throat dimension to Sami spec.</p><p></p><p>Otherwise, get the 8 twist as I recommended and it will be a good long range gun (look at the bullet energy and velocity to guide you in what size animal you should be shooting at what distance). It will then shot the 95's and 105's well without needing max loads. Right now I see no benefit to 115's since the BC is nearly the same as the 105's. The hybrid 105's have been sold out everywhere, but I will get some at the first opportunity. They are apparently less critical of the exact "jump" to the lands.</p></blockquote><p></p>
[QUOTE="westcliffe01, post: 790549, member: 35183"] Your problem is primarily going to be with VLD's. "ordinary" bullets should be less of a problem. But you need to get the throat question sorted out. Having an excessively long throat is the same thing as having a shot out barrel. What your options are depend a lot on your barrel tennon ? Is yours a Remington type action, or a savage style ? The only way to fix the throat, if it is as long as you say, is to have the barrel set back. It is a question of how much. I believe that the AI chamber I have has a Sami style neck and throat, that is probably the way most 243 AI's are made. The only time one expects anything different is for a custom job where someone wants to shoot 115's and specifically requests a lengthened throat. The throat dimension could very well preclude you shooting lighter bullets accurately and may be part of the current problem too. I would be having a word with the rifle builder to see what they were thinking putting a long throat on a 1:9 twist barrel which cannot shoot the heavy and long VLD's in the first place. On the 115's a 7.5 twist is generally recommended. If possible send back the rifle and have them set back the barrel and give you a regular throat dimension to Sami spec. Otherwise, get the 8 twist as I recommended and it will be a good long range gun (look at the bullet energy and velocity to guide you in what size animal you should be shooting at what distance). It will then shot the 95's and 105's well without needing max loads. Right now I see no benefit to 115's since the BC is nearly the same as the 105's. The hybrid 105's have been sold out everywhere, but I will get some at the first opportunity. They are apparently less critical of the exact "jump" to the lands. [/QUOTE]
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.243 AI Loading Question
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