105 sierra

[Precisionhunter417]

Left to right
105 Hybrid, 105 SMK, 107 SMK

105 SMK was 0.050" shorter BTO than the 105 Hybrid.

 

[Kracken McGraw]

View attachment 1742111View attachment 1742112
Left to right
105 Hybrid, 105 SMK, 107 SMK

105 SMK was 0.050" shorter BTO than the 105 Hybrid.

Looks great!

 

[muleystalker]

It seems the new Sierra company is busily copying the competition. Hornady and Berger innovate and Sierra just makes their version. Kind of totally different than the Sierra of 30 years ago.

If you can't beat them, join them. I suspect Sierra is more concerned with massive private and government contracts than reloaders.

You mean like Hornandy copying Henderson on trimmers.... and as you can see above the dimensions of the Berger and new MK are different.

 

[Lance21]

It seems the new Sierra company is busily copying the competition. Hornady and Berger innovate and Sierra just makes their version. Kind of totally different than the Sierra of 30 years ago.

If you can't beat them, join them. I suspect Sierra is more concerned with massive private and government contracts than reloaders.

Hornady innovates? Their newish case trimmer is a total rip off of the Henderson.

 

[DHD]

View attachment 1742111View attachment 1742112
Left to right
105 Hybrid, 105 SMK, 107 SMK

105 SMK was 0.050" shorter BTO than the 105 Hybrid.

I looked at your picture and thought you have a monster sized hand. Able to put a box of bullets, a caliper, and line up 3 bullets. I then noticed it was 2 pictures.

 

[skeetlee]

I did some shooting out to 800 yards yesterday evening. With my Berger 105 hybrids my door was 5.3 mils. With the sierra waterline impacts we’re at 5.1 mils. Not a big difference but some. 31.5 grains Varget, 6 Dasher

 

[SSchnd]

View attachment 1742111View attachment 1742112
Left to right
105 Hybrid, 105 SMK, 107 SMK

105 SMK was 0.050" shorter BTO than the 105 Hybrid.

One thing I noticed on my new 105SMK is the Closed Nose is not quite as pointed as my 107SMK's. Looks the same in your photo.

I hope they rock. thanks for sharing the comparison

 

[64Rambler]

One thing I noticed on my new 105SMK is the Closed Nose is not quite as pointed as my 107SMK's. Looks the same in your photo.

Same for me. The OAL for my lot is ~0.025" short of the listed print dimensions which may account for the "not quite as pointed" part.

 

[ballisticdaddy]

Just loaded a few charge weights using this new bullet and pleasantly surprised that my 6GT seems to like this new offering. Loaded up 100 rounds and shooting first match with them tomorrow. Not too shabby from my PRS rifle with suppressor off a wooden spool with bipod and squeeze bag.

 

[Liven The Dream]

Just loaded a few charge weights using this new bullet and pleasantly surprised that my 6GT seems to like this new offering. Loaded up 100 rounds and shooting first match with them tomorrow. Not too shabby from my PRS rifle with suppressor off a wooden spool with bipod and squeeze bag.

View attachment 1742555

100 OK 200 0r 300 better story Please post....

 

[64Rambler]

I just found "touch" with these, and they are the longest BTO I've got, and I've got 103 V-Tac, 105 Hybrid, 107 SMK and 109 LR Hybrids in stock. How much of the bullet in the neck is considered minimum? 'Cause I've only got about 0.100" of bearing surface in the start of the neck and that's it!

 

[JEFFPPC]

I just found "touch" with these, and they are the longest BTO I've got, and I've got 103 V-Tac, 105 Hybrid, 107 SMK and 109 LR Hybrids in stock. How much of the bullet in the neck is considered minimum? 'Cause I've got about 0.100" of bearing surface in the start of the neck and that's it!

For an old 6brx shooter like myself that just fine.

 

[ELR LVR]

I just found "touch" with these, and they are the longest BTO I've got, and I've got 103 V-Tac, 105 Hybrid, 107 SMK and 109 LR Hybrids in stock. How much of the bullet in the neck is considered minimum? 'Cause I've got about 0.100" of bearing surface in the start of the neck and that's it!

Here's some 600 yd groups with about 0.020" in the neck
Berger 105's and Sierra 107's
(I poked the bullet out to compensate for throat erosion)
they're all about 1/2 MOA
The Middle larger triangle is 115 Bergers at the old seating depth
(Still not terrible, I like the low vertical dispersion, but Horizontal spread was not within my Spec)
the bottm 105 Berger 3 shot group actually has 2 into one hole
---
I use light neck tension anyway, so having minimal in the neck didn't affect anything

 

[G Love]

So would one say these have less bearing surface than a 105 Hybrid?

 

[swd]

Here's some 600 yd groups with about 0.020" in the neck
Berger 105's and Sierra 107's
(I poked the bullet out to compensate for throat erosion)
they're all about 1/2 MOA
the bottm 105 Berger 3 shot group actually has 2 into one hole

Put the Sierra 107's in the lands a bit and magic happens.

 

[ELR LVR]

Put the Sierra 107's in the lands a bit and magic happens.

Most definitely agree there!
Mainly I just need to set this barrel back a little bit, I usually set back when I get a certain amount of throat wear,
and am now of the theory that staying on top of throat wear (setting back a small amount each time vs a large amount) may be a better method
Meaning set back every .050 of throat erosion vs waiting until .300" has happened.
this one doesn't have a whole lot of erosion yet ...Approx .045" from when new.
I usually don't chase the lands but....
i did want to see how it would respond simply poking the bullet further out first.
It did improve and velocity came up which is more what I was hoping for.
---
I figured if the freebore area also erodes in dia, not just lengthwise
I also suspect this may cause flame cutting of the leade as gasses push around past the bullet, accelerating wear, once flame cutting happens, the barrel seems to toast out quickly.
So by setting back a small amount each time may help reduce flame cutting
---
But before setting back I wanted to try poking the bullet out past the worn dia. of the freebore area and seat into proper bore dia. figuring it may reduce bleedoff and bring velocity back up.
It seemed to work. Velocity came back up to 3300 fps
but is of course a temporary band aid until I have time to work on the barrel
but I did like the results of this particular experiment
---
Ways to get the most out of a barrel before tossing it

 

[JEFFPPC]

Most definitely agree there!
Mainly I just need to set this barrel back a little bit, I usually set back when I get a certain amount of throat wear,
and am now of the theory that staying on top of throat wear (setting back a small amount each time vs a large amount) may be a better method
Meaning set back every .050 of throat erosion vs waiting until .300" has happened.
this one doesn't have a whole lot of erosion yet ...Approx .045" from when new.
I usually don't chase the lands but....
i did want to see how it would respond simply poking the bullet further out first.
It did improve and velocity came up which is more what I was hoping for.
---
I figured if the freebore area also erodes in dia, not just lengthwise
I also suspect this may cause flame cutting of the leade as gasses push around past the bullet, accelerating wear, once flame cutting happens, the barrel seems to toast out quickly.
So by setting back a small amount each time may help reduce flame cutting
---
But before setting back I wanted to try poking the bullet out past the worn dia. of the freebore area and seat into proper bore dia. figuring it may reduce bleedoff and bring velocity back up.
It seemed to work. Velocity came back up to 3300 fps
but is of course a temporary band aid until I have time to work on the barrel
but I did like the results of this particular experiment
---
Ways to get the most out of a barrel before tossing it

When I feel the barrel is going away from me I can 90% of the time dial it back in with the tuner. You might try that.I have only ever chased lands on 2 or 3 barrels.

 

[DHD]

I just found "touch" with these, and they are the longest BTO I've got, and I've got 103 V-Tac, 105 Hybrid, 107 SMK and 109 LR Hybrids in stock. How much of the bullet in the neck is considered minimum? 'Cause I've only got about 0.100" of bearing surface in the start of the neck and that's it!

I would say your post is correct. In my case with all of the 100-108 grain 6mm bullets I have on hand, the new 105 SMK will have the longest OAL when seated to the lands. The Sierra 90 grain TGK and possibly the 100 grain TGK (one of the few I don't have) are really long seated to the lands, but the 105 SMK is still longest.

 

[KMW 1954]

I have been shooting Berger 105 Hybrid for a local league and have run out. Thought I had enough to complete the season, but nope.

So last week I took some other 105's I had left over and then took my Hornady comparator and started measuring. Those were the Berger, Barnes Match Burners, Hornady Match and now some recently acquired Sierra MK.

Results using my comparator and caliper;
Berger, LOA 1.269", length BTO .66"
Barnes, LOA 1.20", length BTO .65"
Hornady, LOA 1.23", length BTO .745"
Sierra MK, LOA 1.246", length BTO .611"

 

[1shot]

I just came up with similar results measuring the Berger Hybrids against the 105 Sierra. I haven't had the chance to shoot them yet, but in one of my chambers, to get a jam measurement, I have almost no bullet in the case.