Damn! So glad to have watched this. I was starting to think it was all about my shooting and not the rifle. Thank you for explaining the difference from sporting to bench chambering.
You did a fine job comparing the sporting chamber vs the bentz chamber. The bullet design and the difference in pressure effect on the bullet base because of chamber dimensions. That is, where the pressure is applied to the bullet in relation to the seal created by the base deformation.Your theory about "flyers" seems reasonable when you observe the engagement by the barrel lands. Over the length of bullet. Now... the Eley bullet and the CCI bullet differences in the unmodified chamber. Not wholly explained...My guess would be the difference between the Eley lead bullet and CCI copper jacket bullet. Both brought closer in performance with the bentz chamber. SUBSCRIBED
I'm trying to picture how a Bentz reamer would work with the larger sporting chamber. A drawing would be nice with dimensions of the three chambers. I'll try to Google them. Great work though with the bullet captures and rifling differences on them.
The Bentz chamber dimensions are smaller than a standard sporting chamber. I had to cut about 5/8" off of the barrel so that the Bentz reamer could cut a new chamber. I plan to do more videos of experiments with chambers, reamers, and soft-catching bullets next summer and I appreciate your suggestion to include chamber drawings. Thank you.
@@dauntlessendeavors1000 I stumbled across this video when I was researching the commonality between RAR and RPR actions. Cutting the chamber end and rechambering is fantastic work that very few would do. I just answered my own comment by watching Part 10.
Bullet hardness from lot to lot needs to be uniform. Perhaps a softer alloy may help too. It looks like any variations in escaping gas at the muzzle can influence the bullets while the heel is still in the barrel unsupported by means of creating an imbalance of pressure around the heel at the time of release. I think you are onto something here. I am not sure the manufacturers take any of this into consideration. Wouldn't it be nice to have a 22 shoot sub half inch groups at 100 yards?
I should try that with my ARA. Stock chamber, but good accuracy. Mostly using Aquila or Aguila ammo standard and high velocity. It’s what I have the most of.
You can soft-catch anything but you would probably need a much longer tube. I was particularly interested in recovering 22 LR bullets to see what happens to the base of the bullet and to illustrate how it obturates up to bore/groove diameter under the pressure of firing. 9mm bullet bases are already full diameter when they are made.
@@joostprins3381 Yes. The outside diameter of the 9mm bullet is the same as the internal diameter of the 9mm case. The outer diameter of the 9mm case is larger than the bullet.
Just to add to this conversation, this is where caliber names of 38 and 380 originated. In the early days they employed heal type bullets when developing the early revolver cartridges. The outside case diameter was approximately .380 and essentially that became the cartridge name reference to the bullet and bore diameter. When it was eventually determined that better accuracy resulted from using a flat base full diameter bullet as opposed to a heal type bullet, the bore and bullet diameter was reduced. It also explains why our current 44 caliber revolver cartridges employ .429" diameter bullets. I used to catch bullets including Centerfire rounds in an 8 in steel pipe filled with cotton fabric, typically cut up t-shirts and blue jean material. You are doing some great research here!
In theory, I agree with you completely. I don't have a chronograph, yet, but plan to duplicate these experiments in the future and measure velocity results. In reality, it may only be 10-20 fps faster, however one test is worth 1000 expert opinions. Thanks for watching.
@@dauntlessendeavors1000 thanks for replying, I will get within a month (Dutch law) my RAR LRT and was especially interested in smoothing the bolt and the action support. Great vids, thanks! The Bentz is some steps to far for me, but I can let it do by a weapon smith, if needed.
Damn! So glad to have watched this. I was starting to think it was all about my shooting and not the rifle. Thank you for explaining the difference from sporting to bench chambering.
I found this fascinating. It explains a lot.
Great video, I always love to learn something new. I didn't now that about 22lr's ammo.
Thanks for watching.
You did a fine job comparing the sporting chamber vs the bentz chamber. The bullet design and the difference in pressure effect on the bullet base because of chamber dimensions. That is, where the pressure is applied to the bullet in relation to the seal created by the base deformation.Your theory about "flyers" seems reasonable when you observe the engagement by the barrel lands. Over the length of bullet. Now... the Eley bullet and the CCI bullet differences in the unmodified chamber. Not wholly explained...My guess would be the difference between the Eley lead bullet and CCI copper jacket bullet. Both brought closer in performance with the bentz chamber. SUBSCRIBED
Fascinating. Thanks for describing the differences in sporting and match chambers. That was never very clear to me before.
My pleasure! I'm glad it helped.
Very legitimate logical deductions and irrefutable evidence. Kudos to you sir!!
Great series on the .22 👍👍👍👍
Great explaination ,thanks for doing the research,would do a lot to explain the varied results from your testing video .
I'm trying to picture how a Bentz reamer would work with the larger sporting chamber. A drawing would be nice with dimensions of the three chambers. I'll try to Google them. Great work though with the bullet captures and rifling differences on them.
The Bentz chamber dimensions are smaller than a standard sporting chamber. I had to cut about 5/8" off of the barrel so that the Bentz reamer could cut a new chamber. I plan to do more videos of experiments with chambers, reamers, and soft-catching bullets next summer and I appreciate your suggestion to include chamber drawings. Thank you.
@@dauntlessendeavors1000 I stumbled across this video when I was researching the commonality between RAR and RPR actions. Cutting the chamber end and rechambering is fantastic work that very few would do. I just answered my own comment by watching Part 10.
Bullet hardness from lot to lot needs to be uniform. Perhaps a softer alloy may help too. It looks like any variations in escaping gas at the muzzle can influence the bullets while the heel is still in the barrel unsupported by means of creating an imbalance of pressure around the heel at the time of release. I think you are onto something here. I am not sure the manufacturers take any of this into consideration. Wouldn't it be nice to have a 22 shoot sub half inch groups at 100 yards?
I should try that with my ARA. Stock chamber, but good accuracy. Mostly using Aquila or Aguila ammo standard and high velocity. It’s what I have the most of.
Good info, thank you
Thank you for the compliment. Have a great day.
Still plenty to learn. Thank you!!
How about the 9 mm parabellum ? Because the .22 LR and 9 mm are the most sold calibers in the world. Same principle ?
You can soft-catch anything but you would probably need a much longer tube. I was particularly interested in recovering 22 LR bullets to see what happens to the base of the bullet and to illustrate how it obturates up to bore/groove diameter under the pressure of firing. 9mm bullet bases are already full diameter when they are made.
@@dauntlessendeavors1000 thanks, but does that mean that the case of a 9 mm is more then the 9 mm?
@@joostprins3381 Yes. The outside diameter of the 9mm bullet is the same as the internal diameter of the 9mm case. The outer diameter of the 9mm case is larger than the bullet.
@@dauntlessendeavors1000 thanks.
Just to add to this conversation, this is where caliber names of 38 and 380 originated. In the early days they employed heal type bullets when developing the early revolver cartridges. The outside case diameter was approximately .380 and essentially that became the cartridge name reference to the bullet and bore diameter. When it was eventually determined that better accuracy resulted from using a flat base full diameter bullet as opposed to a heal type bullet, the bore and bullet diameter was reduced. It also explains why our current 44 caliber revolver cartridges employ .429" diameter bullets.
I used to catch bullets including Centerfire rounds in an 8 in steel pipe filled with cotton fabric, typically cut up t-shirts and blue jean material.
You are doing some great research here!
This Bentz chamber should also effect the velocity being higher does it? Less loss of pressure means it can only go one way, or am I reaching here?
In theory, I agree with you completely. I don't have a chronograph, yet, but plan to duplicate these experiments in the future and measure velocity results. In reality, it may only be 10-20 fps faster, however one test is worth 1000 expert opinions. Thanks for watching.
@@dauntlessendeavors1000 thanks for replying, I will get within a month (Dutch law) my RAR LRT and was especially interested in smoothing the bolt and the action support. Great vids, thanks! The Bentz is some steps to far for me, but I can let it do by a weapon smith, if needed.
.22LR wild
RAR. *