140 gr 7mm rem mag load recomendations
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7stw
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I have 3, 7 mags , believe it or not, but they all have different diets and different intentions. As far as a Berger in 140 class, I have had very good luck with about 68-69 grains of H1000' and WLR primers. Also have good luck with about 68.5 -RL22, and 215 primers. Bergers have a sweet spot, mine happens to be with a COAL of 3.336. In my 700 P, that happens to be about .040 off the lands. You may have to experiment, but when you find find the spot, WOW. Everything I have shoots them extremely well, almost sick . AIM SMALL, MISS SMALL. lightbulb
7STW.I was steering towards reloader 22 only because it may be the best suited powder I have for the application. I'm using a vanguard I rec as a gift and I understand that weatherby's have long throats, and like the long jumps. but I have no sammi specs as to O.A.L for these bullets so I'll be playing with that. Thanks for reply
7stw
Well-Known Member
I was steering towards reloader 22 only because it may be the best suited powder I have for the application. I'm using a vanguard I rec as a gift and I understand that weatherby's have long throats, and like the long jumps. but I have no sammi specs as to O.A.L for these bullets so I'll be playing with that. Thanks for reply
Yes an no on the long throat issue. On there proprietary ammo,( ie, 300 Weatherby) they are long throated just as the Ultra mags. I have had a few of them through the years, and have found that the throats on " standard" ammo, are relatively normal in it's setting. However the actual Weatherby rounds are definitely free bored. :gun)lightbulb AIM SMALL, MISS SMALL. 7STW.
So now I'm a little confused. The free bore I assume is the first part of the bore with no rifleing. I think maybe I've heard that the 300 weatherby mag has like .375 of free bore which I presume is huge considering that most handloaders seat bullets touching rifling or maybe .005 .010 of lands. So sammi specs would put that bullet .375 off lands. So does weatherby seat bullets that much deeper or do they chamber there bore with no rifling in the begining. I hope This isn't confusing us more. Then do they chamber standard cartridges with no free bore or does this only appear on the weatherby cartridges I'm not appossed to buying any new component that will boost my selfesteem but my wife may say differently. She doesn't enjoy the local gun shop as much as I do. gun)
7stw
Well-Known Member
So now I'm a little confused. The free bore I assume is the first part of the bore with no rifleing. I think maybe I've heard that the 300 weatherby mag has like .375 of free bore which I presume is huge considering that most handloaders seat bullets touching rifling or maybe .005 .010 of lands. So sammi specs would put that bullet .375 off lands. So does weatherby seat bullets that much deeper or do they chamber there bore with no rifling in the begining. I hope This isn't confusing us more. Then do they chamber standard cartridges with no free bore or does this only appear on the weatherby cartridges I'm not appossed to buying any new component that will boost my selfesteem but my wife may say differently. She doesn't enjoy the local gun shop as much as I do. gun)
You are correct about the unrifled section in front of the chamber at the bullet end. It is designed to let the chamber pressure rise slowly and get no spikes. For the most part, a gun with freebore, typically can not be seated into the lands and still fit in the box. The Weatherby mags do this, and Remington does it with the ultra mags. MOST standard cartridges are not free bored, thus the ability to seat into the riflings and fit the magazine box. I have seen rfles with as much as .500 freebore. Hope this helps.
AIM SMALL, MISS SMALLgun)
Don't sweat the OAL number. If you intend to use this rifle as a repeater, feeding additional rounds from the magazine then you are limited by the magazine length in regards to OAL. Try the longest OAL and see if it feeds from magazine. Work up a load. Once you find the best load you could tweak it by incrementally seating the bullet deeper. .005" at a time could help you find a more accurate seating depth trend. It really depends on how much time you want to spend trying. Naturally there will be a point where the ogive of the bullet is sitting lower than the case mouth which could cause feeding and neck tension issues.
I cannot tell you any hard and fast rules. I will say that I have seen many rifles shoot their best at max magzine length limits and some that liked a seating depth deeper.
Look at this example with a 308 win. I used a Redding competition seater die and incrementally seated .002" deeper. (the numbers are just a reference number) Note that the group was open at #42 but .004"deeper at #46 it tightened it up. As the seating was moved progressively deeper the group opened up then began to tighten AGAIN. There can be more than one "sweet spot" in seating depth.
I cannot tell you any hard and fast rules. I will say that I have seen many rifles shoot their best at max magzine length limits and some that liked a seating depth deeper.
Look at this example with a 308 win. I used a Redding competition seater die and incrementally seated .002" deeper. (the numbers are just a reference number) Note that the group was open at #42 but .004"deeper at #46 it tightened it up. As the seating was moved progressively deeper the group opened up then began to tighten AGAIN. There can be more than one "sweet spot" in seating depth.
