SMK 107 In the lands and jumped

[Bradley Walker]

I made up a large batch of 107 SMK loads for my rifle for testing at 100 yards. I kept the powder charge the same and changed the primer and seating depth. Using R-15 I kept the charge 30.5.

Primers were Rem 7 1/2 and bullets were seated at .020 ITL and .020 jumped.

I saw no real differences. All shot about the same (.25 MOA to .3 MOA very consistently). I think I got a good box of bullets!!! They just went to sleep....

 

[bozo699]

Bradley,
There Tangent ogive makes them more tolerant or forgiving of seating depth variances, or at least this is what I have been lead to believe.
Wayne.

 

[bozo699]

edit to above post,...try shooting them both at 1000 yards and I am sure you will find one that shoot better then the other, my 6brx and 6*284 both liked them jammed at .012 but my partners liked his at about .010 off, each gun to it's own I guess.
Wayne.

 

[Bradley Walker]

edit to above post,...try shooting them both at 1000 yards and I am sure you will find one that shoot better then the other, my 6brx and 6*284 both liked them jammed at .012 but my partners liked his at about .010 off, each gun to it's own I guess.
Wayne.

I am sure. No chrony data. Just saying groups all looked good.

 

[bozo699]

edit to above post,...try shooting them both at 1000 yards and I am sure you will find one that shoot better then the other, my 6brx and 6*284 both liked them jammed at .012 but my partners liked his at about .010 off, each gun to it's own I guess.
Wayne.

I am sure. No chrony data. Just saying groups all looked good.

No doubt, I have always liked Sierra bullets my self for the same reason, the groups are usually good
Wayne.

 

[Bradley Walker]

I think I am going to start testing this way on all bullets.

If the bullet goes from "buckshot" to "bughole" over .040" seating depth, I think I might avoid it.

I keep hearing about these miracle cures of seating depth... I don't see it myself. Everything usually shoots best at either .020 in or .020 out. Just my experience.... Mostly always .020" out... but I haven't shot any VLD's.

 

[bozo699]

I think I am going to start testing this way on all bullets.

If the bullet goes from "buckshot" to "bughole" over .040" seating depth, I think I might avoid it.

I keep hearing about these miracle cures of seating depth... I don't see it myself. Everything usually shoots best at either .020 in or .020 out. Just my experience.... Mostly always .020" out... but I haven't shot any VLD's.

.002 makes or breaks my 105 hybrids in my 6BRX,...5" groups at 1K or 15", I have proved it to myself several times with the same rifle and bullet, so with some rifles and some bullets I think there is a magical number,...German Salazar said it best I think, WHAT AM I TRYING TO ACCOMPLISH if keeping 10 shots in 2 moa at 1K then just about anything would probably work, 1moa and you will have to tighten things up, if your trying to get under 1/2 moa at 1K then every little detail matters including exact seating depth, if your trying to have minute of ground pig then .020 in or ,020 out probably doesn't matter although for function purposes I think if it shot well at either I would opt for the jump rather then the jam, JMHO's
Wayne.

 

[Bradley Walker]

.002 makes or breaks my 105 hybrids in my 6BRX,..

Then I would buy another bullet. IMHO.

 

[bozo699]

.002 makes or breaks my 105 hybrids in my 6BRX,..

Then I would buy another bullet. IMHO.

No there what's winning for me at the moment!
Wayne.

 

[Bradley Walker]

.002 makes or breaks my 105 hybrids in my 6BRX,..

Then I would buy another bullet. IMHO.

No there what's winning for me at the moment!
Wayne.

I am sure they are great and I am glad they are working very well!!!

 

[skeetlee]

Everybody i have talked to says they are jumping those hybrid bullets a bunch. Maybe you need to try a different seating depth all together. I havent measured any hybrids but the berger 105 can vary as much as .005 from bullet to bullet. if .002 made a major difference then your going to have to measure every round to avoid a long bullets or two, or three. Lee

 

[bozo699]

Everybody i have talked to says they are jumping those hybrid bullets a bunch. Maybe you need to try a different seating depth all together. I havent measured any hybrids but the berger 105 can vary as much as .005 from bullet to bullet. if .002 made a major difference then your going to have to measure every round to avoid a long bullets or two, or three. Lee

I do Lee, I sort by bearing surface and by bullet length, I probably wouldn't have used the hybrids but like I do everything I go big, anyone else would have bought 100 to try I bought 1700 and more after that.
Wayne.

 

[pawpaw77]

I use 107 SMK in my dasher. I've tried H4895, varget and rl-15. I've loaded from ITL to .030 jump. All powders shoot good at .025. anything else is scattered. Definitely makes a difference.

 

[DennisH]

My BRX loves 107 about .004 off the lands or just barely kissing! Deadly at 600yds!

 

[Bradley Walker]

I use 107 SMK in my dasher. I've tried H4895, varget and rl-15. I've loaded from ITL to .030 jump. All powders shoot good at .025. anything else is scattered. Definitely makes a difference.

My default seating depth is .025" for everything. It seems to work the best with anything Sierra and Nosler.

 

[DennisH]

edit to above post,...try shooting them both at 1000 yards and I am sure you will find one that shoot better then the other, my 6brx and 6*284 both liked them jammed at .012 but my partners liked his at about .010 off, each gun to it's own I guess.
Wayne.

As per the above, each gun has it's load! As I have stated many times and own several 6mm's, I have some guns that like bullets ITL .020 and one that like the bullets .050 off the lands. I could go down the list, but it would take to much time! Find the spot your gun and bullet likes!

Barrels, primers, bullets all make a difference . . . unbelievable what primers, bullets, seating depth will change in the "same" gun! If your using CCI 450's, try a few plain Winchester primers and see what happens to your groups! For the record, I use all primers, and I use the one that works in the gun I am dialing in, whatever one it might be!

What I would love to figure out: I have a 6x47L and a BRX . . . . Almost the same gun, right! Both have completely different loads and bullets they like! For the record, both are 28" 8 twist heavy barrels! In fairness, the 6x47 has a Kreiger, the BRX has a McGowen. I have shot both @ 600yds and they are almost exactly as accurate. In fact, I only have one point difference between the two @ 600. Hard decesion on which one to take when shooting!