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H4350 load work up - 243 Win.

 
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  #8  
Old 02-14-2013, 09:27 AM
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Re: H4350 load work up - 243 Win.

Rmitch- what rifle? what are going to shoot at? are you using a chrono??
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  #9  
Old 02-15-2013, 08:24 AM
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Re: H4350 load work up - 243 Win.

Rmitch,

When first working up a load, I start low and then load just one round at either .5 gr. increments (for 243 or 270), or at 1 gr. increments (for 338 Lapua). The purpose of this exercise is to help me identify where my max load is with a particular bullet, powder and barrel combination. Once I start to see pressure signs, I back off 1 or 2 grains from there and that becomes my upper limit. Each rifle is unique as to the max pressure/loads it can tolerate.

I have a REM model 7 in 243 with a Brux 1-in-8.5 twist barrel shooting the 105 gr. Begrer vld. I tend to run loads on the warm side - and my Brux barrel seems to be a "fast" barrel. I found 42.5 gr. of H4831sc and 41.0 gr. of H4350 both produce outstanding groups. But remember: seating off the lands, lot number of the powder, even the difference in the guilding metal used in the bullet's jacket, will all have a bearing on pressure. That's why we always caution "start low and work up slowly"' Good luck.
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  #10  
Old 02-18-2013, 11:34 AM
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Re: H4350 load work up - 243 Win.

Quote:
Originally Posted by roninflag View Post
Rmitch- what rifle? what are going to shoot at? are you using a chrono??
Rifle is a Remington 700 SPS Varmint with a 26" barrel/

I use this rifle for mostly long range target shooting.

I currently do not have a chrono.

Here is the Quickload data Ive been looking at.

37gn seems fairly conservative.

Second page is the Quickload data at 41gn that I plan on working up to, still seems pretty safe in regards to pressure...?



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  #11  
Old 02-18-2013, 12:31 PM
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Re: H4350 load work up - 243 Win.

Your data looks fine. It's time to dive in.
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  #12  
Old 02-19-2013, 12:54 PM
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Re: H4350 load work up - 243 Win.

Quote:
Originally Posted by John Galt View Post
I would load 1 shot each of the lower charges just to check the for pressure signs.

My Berger books states that as you increase seating depth you are in effect increasing case capacity and can increase velocity.
First: I do the 1 round per load increment thing to establish pressure indications and get a feel for velocity. Much more economical to make 10 rounds at 1 each for .3 or .5 grain increments than to make 100 rounds at 10 each and waste those that are no where near the expected or desired velocities. I chron 'em and then I graph the results, I believe the "node" are visible by the predicable increment in velocity just prior to a reduction in the increment or even a reduction in velocity. Explained, If a few loads in the ladder show a 50fps per increment increase in velocity but suddenly drops to say 10fps or even back slides for a couple increments then for me, there seems to be a node at the "peak". Not enough data to make this a method but it helps me keep the round count down during load development.

I don't have my data book or I would enter a real example to express the above.

Second: didn't you mean increasing seating depth reduces case capacity and increases velocity?

FWIW: My A-Maxes and V-Maxes all like to be -.005 to -.010 from the lands but WMMV.
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  #13  
Old 02-20-2013, 06:32 AM
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Re: H4350 load work up - 243 Win.

Rmitch223,
What brand of brass are you using? The reason I'm asking is there is a BIG difference in volume from one manufacture to another. For instance a Winchester case has more volume than a Federal. The Win. case will have a lower pressure than the Fed. because of the larger volume.
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  #14  
Old 02-20-2013, 08:37 AM
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Re: H4350 load work up - 243 Win.

Quote:
Originally Posted by tomt View Post
Rmitch223,
What brand of brass are you using? The reason I'm asking is there is a BIG difference in volume from one manufacture to another. For instance a Winchester case has more volume than a Federal. The Win. case will have a lower pressure than the Fed. because of the larger volume.
I'm using Lapua brass. The case capacity is 54.1 grains of H20.
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