Positive compensation or stopped muzzle, a more low tech test.

[Charles E]

Yes, if the ES of most is in the 30 fps range, as both you and Tim mention, that would be significant. While more dramatic, ES is probably not as useful as SD.

I have long thought that 1,000 yard CF and RF have a lot in common, and though that may be true, the ability to handload is a difference. While we might be able to get away with .25 MOA dispersion, we too cannot accept .42 MOA and have any hope of regular success.

Why I keep bringing up the tension-barrel rifles is I imagine our SD is in the low-double digit region -- I do know of higher numbers in successful rifles (not necessarily tension barrel rifles). It is too high to not use some compensation. The TB rifles succeed, Q.E.D there must be compensation. However, it could be that most of the upward motion and muzzle angle is eliminated -- they are incredibly stiff at the muzzle, after all -- but not all of it. In that case, it might be that with the barrel lengths commonly used, we have by luck found a natural compensation mode.

I don't know either the cause, or the answer. I'm really trying to enlist the help of the engineers like Keith to try and explain a phenomena, with the carrot being it may have application in RF.

 

[tim]

Yes, if the ES of most is in the 30 fps range, as both you and Tim mention, that would be significant. While more dramatic, ES is probably not as useful as SD.

I have long thought that 1,000 yard CF and RF have a lot in common, and though that may be true, the ability to handload is a difference. While we might be able to get away with .25 MOA dispersion, we too cannot accept .42 MOA and have any hope of regular success.

Why I keep bringing up the tension-barrel rifles is I imagine our SD is in the low-double digit region -- I do know of higher numbers in successful rifles (not necessarily tension barrel rifles). It is too high to not use some compensation. The TB rifles succeed, Q.E.D there must be compensation. However, it could be that most of the upward motion and muzzle angle is eliminated -- they are incredibly stiff at the muzzle, after all -- but not all of it. In that case, it might be that with the barrel lengths commonly used, we have by luck found a natural compensation mode.

I don't know either the cause, or the answer. I'm really trying to enlist the help of the engineers like Keith to try and explain a phenomena, with the carrot being it may have application in RF.

Well, I've always been of the opinion they are materially different although I've no hard data. I just think, based on years of experimenting, that low pressure, waxed lead, slow moving slugs, have unique vibration/harmonic considerations. I also tend to suspect that interior dimensions impact barrel harmonics more than we're led to believe. I'd love to see some side by side hamonic evaluations on 2 barrels of different interior dimension.