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Developing a load from scratch

 
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  #1  
Old 01-28-2012, 10:26 AM
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Join Date: Oct 2011
Location: Indiana
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Developing a load from scratch

Alright, im going to start working up a load for my 7mm RM, first time. I have decided to try H-1000 for powder and will be using 168gr Berger VLDs. Most reloading manuals i can find for this load say about 62gr start and about 70gr max.

So, would i be safe to start in the 66-67gr area and work up slowly? And from what i have been reading, it seems best to see what charge it likes and safely shoots and THEN start playing with seating depth, correct? So if this is correct, then my last question is, what distance off the lands should i load them while playing with charge volume? I was thinking maybe .040" or .060" off the lands to start, then once i decide on a charge load some .020" in either direction and see what shoots best. Any advice or common practice would be appreciated. Thanks.
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Weatherby Vanguard 7mm Rem Mag
Leupold VX-III CDS 4.5-14 x 40mm
HSM Trophy Gold w/ 168gr Berger VLD
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  #2  
Old 01-28-2012, 08:53 PM
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Join Date: Jan 2010
Location: NC mountains
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Re: Developing a load from scratch

Quote:
Originally Posted by Tater1985 View Post
Alright, im going to start working up a load for my 7mm RM, first time. I have decided to try H-1000 for powder and will be using 168gr Berger VLDs. Most reloading manuals i can find for this load say about 62gr start and about 70gr max.

So, would i be safe to start in the 66-67gr area and work up slowly? And from what i have been reading, it seems best to see what charge it likes and safely shoots and THEN start playing with seating depth, correct? So if this is correct, then my last question is, what distance off the lands should i load them while playing with charge volume? I was thinking maybe .040" or .060" off the lands to start, then once i decide on a charge load some .020" in either direction and see what shoots best. Any advice or common practice would be appreciated. Thanks.
I have a 7RM and am also using H1000. I personally think you would be just fine starting with 66-67 grains. I am currently using 70 grains with the 168s. I would also agree that the next step would be to experiment with the seating depths, but I wouldn't move .02" because I think that is moving it too much. Take a look at the sticky thread (I think it's called) "Getting the most accuracy from Berger bullets" or something like that. It will give you a much better guideline for finding the sweet spot as far as seating depth goes.
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  #3  
Old 01-29-2012, 06:26 PM
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Join Date: Mar 2007
Location: Dallas,OR
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Re: Developing a load from scratch

Here is my .02 for the 7mag. I think you'll be fine starting at say 68grs. I have ALWAY'S had the best results by loading 4each. at 68grs. at .005", .010", .015", .020 and .025" FROM the lands. One of those is going to shoot the best. Then go up in .5gr. increments at the best seating depth until you show signs of pressure or they all shoot into almost 1 hole. If you have a chrony use it, and by all means try this at 200yds. 100yds is meaningless! Good luck! If you don't know how to find a particular seating depth or a way to measure from the bullets ogive you need to take a step back and start there.
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Old 01-30-2012, 01:04 AM
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Join Date: Apr 2010
Location: Allen, TX
Posts: 2,608
Re: Developing a load from scratch

Quote:
Originally Posted by Tater1985 View Post
Alright, im going to start working up a load for my 7mm RM, first time. I have decided to try H-1000 for powder and will be using 168gr Berger VLDs. Most reloading manuals i can find for this load say about 62gr start and about 70gr max.

So, would i be safe to start in the 66-67gr area and work up slowly? And from what i have been reading, it seems best to see what charge it likes and safely shoots and THEN start playing with seating depth, correct? So if this is correct, then my last question is, what distance off the lands should i load them while playing with charge volume? I was thinking maybe .040" or .060" off the lands to start, then once i decide on a charge load some .020" in either direction and see what shoots best. Any advice or common practice would be appreciated. Thanks.
That's basically how I do it.

I start .010" off the lands and make sure the rounds will fit in the magazine. I almost never go closer than .010" for a hunting load.

I prefer to hold seating depth constant until I've worked up to max load and found the desired accuracy node and then play with seating depth.

It's an iterative process and either way will work so long as you don't get in a hurry, cut corners, and change multiple variables at the same time.

-- richard
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  #5  
Old 01-30-2012, 06:13 AM
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Join Date: Oct 2011
Location: Indiana
Posts: 38
Re: Developing a load from scratch

Quote:
Originally Posted by moombaskier View Post
Here is my .02 for the 7mag. I think you'll be fine starting at say 68grs. I have ALWAY'S had the best results by loading 4each. at 68grs. at .005", .010", .015", .020 and .025" FROM the lands. One of those is going to shoot the best. Then go up in .5gr. increments at the best seating depth until you show signs of pressure or they all shoot into almost 1 hole. If you have a chrony use it, and by all means try this at 200yds. 100yds is meaningless! Good luck! If you don't know how to find a particular seating depth or a way to measure from the bullets ogive you need to take a step back and start there.
I have the Hornady bullet comparator set, so i will be able to measure. Im waiting to get my gun back from a friend thats floating the barrel for me. I need to measure my max OAL and deterine what the max is that will fit in my magazine.
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Weatherby Vanguard 7mm Rem Mag
Leupold VX-III CDS 4.5-14 x 40mm
HSM Trophy Gold w/ 168gr Berger VLD
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  #6  
Old 01-30-2012, 11:54 AM
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Join Date: Mar 2007
Location: Dallas,OR
Posts: 349
Re: Developing a load from scratch

That will work just fine. I've never loaded for a Vangard before. I'm curious as to whether you can seat the bullet .010" or so from the lands and have it fit in the magazine.
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  #7  
Old 01-31-2012, 10:38 AM
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Join Date: Oct 2011
Location: Indiana
Posts: 38
Re: Developing a load from scratch

UPDATE:

I went to my buddy's last night, he is still not done working on the gun. But I went over to get the measurements I needed for reloading.

I took the bolt out and used my OAL guage and dummy case with a Berger VLD to check the MAX OAL to the ogive. I took several measurements to check and recheck myself.

2.707"
2.716"
2.725"
2.727"
2.725"
2.725"

I'm not sure if their was some fouling that was giving me short readings for the first few or what, but I feel pretty confident that 2.725" is a repeatable measurement to the lands.

My plans right now are to make up these loads using H-1000 to try:

4 @ 66.0gr/2.715"
4 @ 67.0gr/2.715"
4 @ 68.0gr/2.715"
4 @ 69.0gr/2.715"
4 @ 70.0gr/27.15"

(I did measure a factory HSM cartridge OAL to the ogive and it was 2.645" and when in the mag it looked to easily have 0.125"-0.150" clearance, so the this would equate to approximately 2.770" max mag length, so I should ok with whatever length I load as far as mag length.)

Once I find a safe max or a real shooter I will probably try the same charge at 2.695", 2.675" and 2.655" to see if any shoot better with more jump to the lands.
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Weatherby Vanguard 7mm Rem Mag
Leupold VX-III CDS 4.5-14 x 40mm
HSM Trophy Gold w/ 168gr Berger VLD
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