accurate load


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x_wrench
April 24, 2012, 08:13 PM
so, my brother finally got his browning bar (semi-auto) out of layaway, and picked up a set of dies. he wants me to load him up some shells. which i have no problem with. of course, with a new (to him) gun, and never before loading for an '06, i am faced with trying to come up with loads that will eventually be accurate. i started thinking about this, and i wonder, how does an ammunition factory do this? they test for pressure and speed out of a universal receiver from what i understand. and the barrel vibrations in that set up is going to be nothing like a sporting rifle. obviously, they are not just throwing a safe charge in the case, and shipping them out the door. either there is some formula they use, or, someone gets to sit and fire rounds for days on end trying to find a load that works in several rifles that they have on hand. that seems like it would be a major undertaking. and it would have to be repeated every so often to make sure that the production lines are actually turning out ammo that will be at least semi accurate out of most guns. i would like to get close in as few rounds as possible. i doubt i would be able to get first load success. but it would be nice to only shoot 5 or 6 different loads to get in the ballpark.

p.s. i have imr4350, imr4831, benchmark, and reloder 7 powder. i also have hornady 180g btsp interlocks, and sierra 165 bt's. and of course, cases and primers.

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rcmodel
April 24, 2012, 09:27 PM
They load to a standard pressure close to, but lower then MAX, with a decent bullet, with a standard OAL that will work in any SAAMI standard chamber.

If you do the same thing, your chances are as good as the factory your loads will be as accurate in any given rifle.

I load like that for three .223 rifles and my "standard .223 Load" will shot sub-MOA in the two rifles with scopes all day.

Not so much for the Mini-14, but it does O.K. with the "standard load" with open sights too.

I believe there is WAy too much todo about loading to the lands and all that.
But especially for a semi-auto like a BAR!

Don't even try, cause you can't, and it won't fit the magazine & feed anyway.

rc

x_wrench
April 24, 2012, 09:42 PM
yes, i knew i would have to stay with saami standards for oal and pressure. in fact, the one thing i told my brother is i will not hot rod it. recipe for disaster! so, if i am understanding you correctly, what your saying is pick something in the middle of the load data, and it will most likely be close? for instance, the hodgdon website lists data of 56.0 to 60.0(c) of imr4350 for a 165g bullet. so if i put 58.0g of powder in it, there is a decent chance it could be ready to go and shoot accurately. that would be great. it seems i seldom get that lucky. especially with my 223. that is the most finicky firearm i have ever owned. my 300 mag seems to like loads on the top end of the scale. usually very near, if not right at max. but at least it is easy to "tune" load wise.

rcmodel
April 24, 2012, 09:49 PM
I would not suggest you jump right into a mid-range powder charge without starting at the start and working up as usual.

But the BAR should operate nicely at med to high pressure.

The only one I have any experience with was in 7mm mag, and it shot every factory load I tried in it pretty darn good.

rc

steve4102
April 24, 2012, 10:06 PM
Start with R-17. You can thank me later.

mmitch
April 24, 2012, 10:15 PM
The Lyman 49th edition suggests "accuracy" loads. Much will depend on what his rifle "likes".

Mike

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