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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Does A Can or Suppresor Increase Back Pressure and Decrease Velocity??? Well????
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<blockquote data-quote="QuietTexan" data-source="post: 2440494" data-attributes="member: 116181"><p>So if you agree that an indeterminable volume of gas and resultant loss of pressure results from bullet engraving, ipso facto everything involved in the engraving process makes an impact on internal ballistics. Seating depth, interference fit of bullet in the neck, crimping, leade angle (+P throating from DE has a lot of evidence to support this one), cross sectional area of the bore, weight of the bullet itself, burn rate of the powder, the resulting velocity of the pressure front, the volumetric flow rate of the gas, and more.</p><p></p><p>These are all painfully small variables to try to quantify, but the increase in velocity of a bullet due to adding a suppressor that is consistently experimentally ascertained is also a small gain. Just like the change in velocity due to seating depth is consistently shown in my results. Neither of these have ever shown up in my data at a statistically significant level. Doesn't mean they're "imaginary".</p><p></p><p>Twenty years ago the thought of using a $50,000 radar to measure BCs of bullets sold to consumers probably sounded insane. Yet in 2007, AB was started and ELR is off to the races. The accuracy and precision demanded by shooters has resulted in a massive shift in bullet design towards monolithic copper bullets made on CNC lathes. Those are inarguably the most accurate and consistent bullets on the market today. Want proof? The one Berger bullet that placed in the Top 25 at Kof2M wasn't even a traditional Berger, its a 375 copper mono designed by the guy that thought the expensive radar was a good idea.</p><p></p><p>Things that are small like this are part of the way forward in the sport. 20 years ago bullet design was ancient by todays standards. 20 years before that case design and QC was in its infancy compared to where we're at now. Who turned necks in the 60s? Who does it today? Progress marches on. Shawn Carlock's +P designs are IMO potentially revolutionary in the sense it could challenge throating designs in the same way the 40* shoulder and WSM/SAUM designs changed cases. </p><p></p><p></p><p>I've been meaning to do it again, it's been two years now since I did that test I think? Just honestly never got back to it, it was such a small difference I basically said "hmm that's weird" and kept working towards other goals.</p><p></p><p>Still on my quest for the 40-shot 5fps SD, when I get there I'll be sure to revisit the small things like this and seating depth.</p><p></p><p></p><p>I'm not sure about the 1/10,000th of a second - propellant burn takes ~4 microseconds, or 40/10,000ths to burn completely. The bullet weight is so much more that there is a very large velocity differential between the pressure front of the gas expansion as it leaves the case and the bullet moving that there's more than enough time for a (WAG) 1%+ of the total volume to bleed around. The gas doesn't only move out of the case after the bullet starts moving, the expansion of the neck off the bullet is part of expansion before the bullet engraves. Gas has time to shoot around the case neck before the case fully seals even though the neck moves enough to release the bullet.</p></blockquote><p></p>
[QUOTE="QuietTexan, post: 2440494, member: 116181"] So if you agree that an indeterminable volume of gas and resultant loss of pressure results from bullet engraving, ipso facto everything involved in the engraving process makes an impact on internal ballistics. Seating depth, interference fit of bullet in the neck, crimping, leade angle (+P throating from DE has a lot of evidence to support this one), cross sectional area of the bore, weight of the bullet itself, burn rate of the powder, the resulting velocity of the pressure front, the volumetric flow rate of the gas, and more. These are all painfully small variables to try to quantify, but the increase in velocity of a bullet due to adding a suppressor that is consistently experimentally ascertained is also a small gain. Just like the change in velocity due to seating depth is consistently shown in my results. Neither of these have ever shown up in my data at a statistically significant level. Doesn't mean they're "imaginary". Twenty years ago the thought of using a $50,000 radar to measure BCs of bullets sold to consumers probably sounded insane. Yet in 2007, AB was started and ELR is off to the races. The accuracy and precision demanded by shooters has resulted in a massive shift in bullet design towards monolithic copper bullets made on CNC lathes. Those are inarguably the most accurate and consistent bullets on the market today. Want proof? The one Berger bullet that placed in the Top 25 at Kof2M wasn't even a traditional Berger, its a 375 copper mono designed by the guy that thought the expensive radar was a good idea. Things that are small like this are part of the way forward in the sport. 20 years ago bullet design was ancient by todays standards. 20 years before that case design and QC was in its infancy compared to where we're at now. Who turned necks in the 60s? Who does it today? Progress marches on. Shawn Carlock's +P designs are IMO potentially revolutionary in the sense it could challenge throating designs in the same way the 40* shoulder and WSM/SAUM designs changed cases. I've been meaning to do it again, it's been two years now since I did that test I think? Just honestly never got back to it, it was such a small difference I basically said "hmm that's weird" and kept working towards other goals. Still on my quest for the 40-shot 5fps SD, when I get there I'll be sure to revisit the small things like this and seating depth. I'm not sure about the 1/10,000th of a second - propellant burn takes ~4 microseconds, or 40/10,000ths to burn completely. The bullet weight is so much more that there is a very large velocity differential between the pressure front of the gas expansion as it leaves the case and the bullet moving that there's more than enough time for a (WAG) 1%+ of the total volume to bleed around. The gas doesn't only move out of the case after the bullet starts moving, the expansion of the neck off the bullet is part of expansion before the bullet engraves. Gas has time to shoot around the case neck before the case fully seals even though the neck moves enough to release the bullet. [/QUOTE]
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Does A Can or Suppresor Increase Back Pressure and Decrease Velocity??? Well????
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