Sierra 155gn MKBT

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Dreamcaster51
Posts: 5
Joined: Tue Sep 05, 2017 10:51 am

Sierra 155gn MKBT

#1 Postby Dreamcaster51 » Tue Sep 05, 2017 12:36 pm

Hi guys, newbie here so be gentle :D
I could only afford a Howa for my new 308, 24" barrel, heavy barrel
with a 10 twist.
I am shooting Sierra 155 mk using 2206h powder, reason being I use this powder
in my 223, I am on the pension so I try to use one powder only. :lol:
I have tried 39.5 gn of 2206h behind the pill and get quite good
clover leaf groups BUT the group is 4 inches below where I aim. I realise
I could just alter the scope but it seems too light.
I am getting 2550 fps at this load but it seems slow to me.
I have tried 43gn with a reasonable group but O am asking if any one
that has the same set up is having sny luck. AsI said I am new to this
bench rest shooting and am loving it but I would like to get better
groups.
Any help would be appreciated, thanks.

johnk
Posts: 2168
Joined: Sun Sep 07, 2008 7:55 pm
Location: Brisbane

Re: Sierra 155gn MKBT

#2 Postby johnk » Tue Sep 05, 2017 12:58 pm

That 39 is a fairly soft load for 2206H with 155s. Have you checked out the ADI Web site?

http://www.adi-powders.com.au/handloade ... Winchester

scott/r
Posts: 457
Joined: Wed Aug 27, 2014 8:22 pm
Location: far north brisbane

Re: Sierra 155gn MKBT

#3 Postby scott/r » Tue Sep 05, 2017 1:39 pm

I'm running 45.0 of 2206h in a 32" barrel, so you have a fare way to go yet. 2550fps is quite a bit slow as well. You'll get blown around a lot and your elevations will be through the roof by time you get back to the longs.
If I were you, I'd start looking for a load at about 44.5 and work your way up from there. You should find another node around there.

Dreamcaster51
Posts: 5
Joined: Tue Sep 05, 2017 10:51 am

Re: Sierra 155gn MKBT

#4 Postby Dreamcaster51 » Tue Sep 05, 2017 2:23 pm

Thanks for the comments, I thought it was a bit gentle, nice to shoot though :-)
My friend has a Ruger Tac type rifle with all the addons, his is 24" one in 10 twist as well and he is shooting 43gn of 2206h with the same pill and doing
quite well. I just thought I would check.
Thanks once again.

argh
Posts: 46
Joined: Wed Sep 04, 2013 4:25 pm
Location: Central Coast, NSW

Re: Sierra 155gn MKBT

#5 Postby argh » Tue Sep 05, 2017 7:31 pm

I was shooting 155s in my factory howa barrel using 46.0gr of 2208 for atound 2820fps. I never got 2206H to group very well ??
Just note that the factory barrel has a very long throat so seating anywhere near tge lands means only having 2 to 3mm of projectile in the neck

Dreamcaster51
Posts: 5
Joined: Tue Sep 05, 2017 10:51 am

Re: Sierra 155gn MKBT

#6 Postby Dreamcaster51 » Mon Sep 18, 2017 2:49 pm

Thankj Argh, found the same. Good friend of mine checked for me as I thought I was wrongbut very long throat. I now load around 2.200" for thr 155. I am going to try some 2308 with Ferderal match primers to see if I get any improvement. I also have some 168gn and Hornady 180gn to load as well.

Dreamcaster51
Posts: 5
Joined: Tue Sep 05, 2017 10:51 am

Howa 1500 308 24" 10 twist

#7 Postby Dreamcaster51 » Tue Dec 19, 2017 10:59 pm

OK ended up sending my rifle back to the agent as they asked to have a look. To their credit they were very good about it. I got it back with a target showing two groups like mine BUT one group under .030" using Hornady 155gn Steel Match factory loads. The question I ask now has anyone got these little buggers in their ammo locker that could measure them for me. I am after the COAL and Ogive so I can have a try a duplicating them. Why not just go and buy some you ask? well here in the river land they are $85 per box and I ain't got those bucks. If any one can help with the info it would be great. thanks

MR.Sako
Posts: 33
Joined: Mon May 23, 2016 7:19 am
Location: Grafton Rifle Club

Re: Sierra 155gn MKBT

#8 Postby MR.Sako » Wed Dec 20, 2017 7:44 am

first of all your way under the minimum load for 06h which is 43 gr second of all try the 155gr hbc. i have a mate with a howa varmint in 308 that shoots hbc's incredibly well with a 15 thou jump.

mike H
Posts: 507
Joined: Mon May 08, 2006 5:34 pm
Location: JUNEE NSW

Re: Sierra 155gn MKBT

#9 Postby mike H » Wed Dec 20, 2017 7:53 pm

MR.Sako wrote:first of all your way under the minimum load for 06h which is 43 gr second of all try the 155gr hbc. i have a mate with a howa varmint in 308 that shoots hbc's incredibly well with a 15 thou jump.

Good advice above,what the Hornady projectiles measure has no bearing on what other other brands of projectiles may need to perform at there best.I have shot rifles with more than 50,000" jump successfully.

Dreamcaster51
Posts: 5
Joined: Tue Sep 05, 2017 10:51 am

Re: Sierra 155gn MKBT

#10 Postby Dreamcaster51 » Tue Jan 09, 2018 10:35 pm

Hi MR Sako, a very happy new year to you.
Just a quick one, if i were to load 155gn Nosler CC in my howa with a 15 thou jump they would not be in the shell casing :-)
His Howa must be different to mine, Mine has a very very long throat, even 168gn Sierra match king seated just right have around 70 thou jump.


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