Erik Cortina's YouTube Channel

[queen_stick]

Erik,

I like the video on the Bob Green bullet comparator. It raised a couple of questions, and I hope this is an appropriate place to ask...

1) On a bullet that measures long or short of the norm, have you ever measured the bearing surface thickness/diameter (closest to the ogive) to see if that's the source of the change?

2) This has been discussed many times, but why are there no bullet seaters on the market that contact the bullet where the rifling does? It wouldn't alleviate the need to sort, but it would allow you to seat all bullets to the same depth without adjustment.

Keep the videos coming!

Walt

 

[Erik Cortina]

Erik,

I like the video on the Bob Green bullet comparator. It raised a couple of questions, and I hope this is an appropriate place to ask...

1) On a bullet that measures long or short of the norm, have you ever measured the bearing surface thickness/diameter (closest to the ogive) to see if that's the source of the change?

2) This has been discussed many times, but why are there no bullet seaters on the market that contact the bullet where the rifling does? It wouldn't alleviate the need to sort, but it would allow you to seat all bullets to the same depth without adjustment.

Keep the videos coming!

Walt

I haven't measured bearing surface diameter, but I will soon. I'm looking for a good tool to do so, perhaps a .00005" micrometer can do that or maybe I need to build a tool for it.

On the seater, if you have a stem that contacts the same place as the rifling does, the bullet will get stuck in the seater stem because depending on neck tension, it jams in the stem like it does in the barrel.

 

[queen_stick]

Makes sense. Thanks for the reply, Erik.

 

[Erik Cortina]

Precision reloading tools #3: Giraud powered brass trimmer

[youtube]http://youtu.be/QuN_gDM6Tak[/youtube]

 

[Phil]

Eric,

Just watched the Giraud trimmer video, very nice.

I spotted something interesting, is that a .223 case with the bottom end cut off that appears to be stuck on the end of the powder tube on your powder thrower?????

Phil.

 

[Forum Boss]

Erik's latest video is featured in today's edition of the Daily Bulletin. Erik provide some very smart tips, including using a die lock ring to set the case holder height (which controls trim length).

If you doubted the precision of this powered trimmer, watch Erik's video. He quickly trims five cases in 15 seconds then measures them with calipers. All five trimmed cartridges measure within .0005. That's an ES of one half thousandth.

Eric also shows how the Giraud trimmer tool can be adapted to trim bullet meplats.

Watch video with supporting photos and text here:

http://bulletin.accurateshooter.com/2015/01/using-the-giraud-power-trimmer-smart-video-from-erik-cortina/

 

[Dos XX]

Great video, Erik.

 

[Erik Cortina]

Thanks Forum Boss for the support.

 

[Erik Cortina]

Eric,

Just watched the Giraud trimmer video, very nice.

I spotted something interesting, is that a .223 case with the bottom end cut off that appears to be stuck on the end of the powder tube on your powder thrower?????

Phil.

Phil, I think I need to throw a cover over my tools on future videos. You guys have a sharp eye! LOL

It's a 6BR case cut off using a tube cutter (any .308 Win. family case works). I'll make a video on that as well.

 

[Killick]

Erik,
I've subscribed to your channel and am enjoying it immensely. If this hasn't already been requested I'd like to propose a subject, that being terminal velocity as opposed to muzzle velocity for a particular caliber/load. I remember someone, maybe Brian Litz ran a test with 2 chronographs, one near the muzzle and one at the target to measure the actual terminal velocity at 1,000 yds. Maybe test a .308 with Federal Match ammo as a control and run however many other calibers you deem fit for this project. I'm not at all certain of the feasibility of this project due to the availability of a 'wide' terminal chronograph, standard chronographs having only 1.5" to 2" wide sensors. Perhaps at 600 yds. would be do-able.

 

[Erik Cortina]

Erik,
I've subscribed to your channel and am enjoying it immensely. If this hasn't already been requested I'd like to propose a subject, that being terminal velocity as opposed to muzzle velocity for a particular caliber/load. I remember someone, maybe Brian Litz ran a test with 2 chronographs, one near the muzzle and one at the target to measure the actual terminal velocity at 1,000 yds. Maybe test a .308 with Federal Match ammo as a control and run however many other calibers you deem fit for this project. I'm not at all certain of the feasibility of this project due to the availability of a 'wide' terminal chronograph, standard chronographs having only 1.5" to 2" wide sensors. Perhaps at 600 yds. would be do-able.

Should not be too hard to set up as the Oehler 35 should be able to pick up a 10" group easily. The shots not recorded can easily be omitted from the muzzle chronograph.

I'll think about how I can do that.

 

[Erik Cortina]

[youtube]http://youtu.be/TZr6COVLNvs[/youtube]

 

[Erik Cortina]

[youtube]http://youtu.be/wcrHvSG1spg[/youtube]

 

[ShootDots]

Erik, I saw that she was not in love with recoil! Now is the perfect time to chamber her a 6 Dasher! She WOULD love that, T-Rust me!

 

[queen_stick]

Erik,

quick question... I have a 6mm bullet comparator that measures .232 ID... Do you think that's close enough to the .236 and .237 6mm bores, or look into changing it out with something closer? (asking here, as it relates to your bob green comparator video).

 

[Erik Cortina]

Erik, I saw that she was not in love with recoil! Now is the perfect time to chamber her a 6 Dasher! She WOULD love that, T-Rust me!

It surprised her. She was fine the rest of the way. She was shooting full power loads, I will probably load her a light load until she gets used to it, and then she will likely be wiping the floor with us at 600 yards soon! lol

 

[Erik Cortina]

Erik,

quick question... I have a 6mm bullet comparator that measures .232 ID... Do you think that's close enough to the .236 and .237 6mm bores, or look into changing it out with something closer? (asking here, as it relates to your bob green comparator video).

That should be close enough, however, opening it up is very easy.

 

[ShootDots]

I would love to see her come to any of the matches.. Methinks that 300 on a bit of a switchy day may test her mettle to the max... 600 on one of our switchy days may cause her to get frustrated rather quickly!

 

[queen_stick]

Erik,

quick question... I have a 6mm bullet comparator that measures .232 ID... Do you think that's close enough to the .236 and .237 6mm bores, or look into changing it out with something closer? (asking here, as it relates to your bob green comparator video).

That should be close enough, however, opening it up is very easy.

was just thinking that, thank you sir.

 

[Dos XX]

Hey! You let that deer get away?