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SnipeTac338

 
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  #8  
Old 05-31-2010, 12:10 AM
Silver Member
 
Join Date: Jul 2009
Location: Sydney,Australia
Posts: 321
Re: SnipeTac338

Just thought.......going by the lawton gear looks like a grenfell job.
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  #9  
Old 05-31-2010, 01:31 AM
Junior Member
 
Join Date: Jun 2009
Location: Bullhead City, Arizona
Posts: 19
Re: SnipeTac338

Quote:
Originally Posted by ridge rider View Post
You mention you're having some short comings, what are they, if you don't mind me asking?
Well, I may be asking too much of the brass, I'm on my 3d reload after fire-forming. If I wish to get to the bolt to open easily, I cannot put more than 129 grains of H50BMG in the case using the 300 Lapua Scenar. I'm not even getting to 3000 fps. I've tried working the loads up to about 3200fps, but I've broken two extractors in the process and broken a few caseheads. I have backed down reluctantly.
I have some GS 295's I was hoping to start using, but this lackluster performance is putting the brakes on my enthusiasm.
Perhaps with my particular rifle, 2 loadings is all that can be expected.

Lawton 8000
M310 contour, 32"
1 in 8" twist
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  #10  
Old 05-31-2010, 01:38 AM
Junior Member
 
Join Date: Jun 2009
Location: Bullhead City, Arizona
Posts: 19
Re: SnipeTac338

I must clarify, it may be the brass. I began reloading using dies that have been found a little fat. This may have unreasonably stressed the brass. I have since changed to another tighter die, but the damage may already have been done.

Even saying this, I can't see how some can approach 150 grains of H50BMG using a 300 grain bullet
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  #11  
Old 05-31-2010, 03:53 AM
Silver Member
 
Join Date: May 2009
Location: Melbourne Australia
Posts: 136
Re: SnipeTac338

Not being an expert in this department but I believe your twist rate might be inhibiting you from achieving high velocities with the heavy 300 grain bullets.
Have you tried the 300 SMK.
My SnipeTac338 is being built as a single feeder and as such is not being built on the largest Lawton action to keep the weight down somewhat.
Barrel is 32" with 1:9.5 twist.
Geoff Grenfell is doing the build.
I also spoke with Dave Viers who developed this round and he is confident my rifle should perform very well with this twist and barrel length as he has had excellent results in that combo with the 300 SMK.
I've been told Shawn Carlock has been getting some not so good results with the new Berger 300 grain Hybrids at speeds over 3000 fps.
Under 3000 fps they perform very well, over 3000 not so good.
I am only surmising that the new Bergers may group better well past 3000 fps, which obviously Shawn cannot achieve in his 338 Egde including his new improved 338Edge+.
Sorry Shawn and please correct me if I am wrong as I do not mean to offend you here.
I have found in both of my Weatherbies 30-378 (210 Berger VLD at 3250 fps) and 338-378 (300 SMK at 2884fps) that there are at least two accurate node points where accuracy is very good at relatively high speeds according to reloading manuals.
However because the Weatherby action is extremely strong I push the speed up a bit more and then they both produce large groups but crank up the speed some more and then the groups tighten up again as faster speeds are reached.
I push them bullets to the limits and the groups really tighten up but this calls for running "hot" loads where I am just starting to get a faint extraction plunger mark in my brass but with no stiff bolt on extraction.
Incidentally these cases have already been loaded 5 times and the primer pockets are still relatively good to the feel by hand priming, however accuracy is now dropping off and I suspect these cases need neck annealing etc...
I have since loaded up a new batch with new cases and accuracy is back on track and groups are very tight once again.
I find that if I push these Weatherbies into "hot" load territory they both shoot exceptionally well and in fact the 30-378 puts three shots into the same hole at 100 yards at times whilst the 338-378 produces at best 1/4" groups.
Both rifles have had their actions bedded with Devcon and their triggers worked down to 1 pound trigger pull.
With the SnipeTac338 and these new 300 grain Berger Hybrids I believe I might somehow end up being somewhat a bit of a pioneer in Australia during my load development especially at very high speeds well above 3000 fps.
I am not too worried if these new Berger pills do not perform well in the SnipeTac338 above 3000 fps as the 300 SMK's do perform well at speeds around 3300fps.

Last edited by ridge rider; 06-01-2010 at 08:31 AM.
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  #12  
Old 05-31-2010, 02:01 PM
Junior Member
 
Join Date: Jun 2009
Location: Bullhead City, Arizona
Posts: 19
Re: SnipeTac338

Quote:
Originally Posted by ridge rider View Post
Not being an expert in this department but I believe your twist rate might be inhibiting you from achieving high velocities with the heavy 300 grain bullets..
You're point is a good one. Since I was preferring to eventually use the GS bullets, hence the twist, I shouldn't expect the conventional bullets and loadings to yield a conventional result. 20 grains less because of twist was unexpected. I did not mean to mislead anyone.
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  #13  
Old 05-31-2010, 05:09 PM
Gold Member
 
Join Date: May 2007
Location: VICTORIA AUSTRALIA
Posts: 912
Re: SnipeTac338

Welcome aboard TT !

This is where it all happens mate !

You will get lost it the depth of great info on the "HOME" of LRH.

DUH
__________________
With each step in the bush, you are a step closer.
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  #14  
Old 05-31-2010, 05:29 PM
Silver Member
 
Join Date: May 2009
Location: Melbourne Australia
Posts: 136
Re: SnipeTac338

Thanks SW

You are absolutely spot on with your comment and this is the fun of building / developing a new rifle and its load.
So many powders, primers, projectiles, seating depths and so many other variables as we all know come to play in this game.
However it is a good feeling when everything comes together well.
Time will tell.
Just have to wait and bide my time for the Terminator to be built.
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