What is bigger a 300win mag or a 7mm?

Answer 1

The 300 Win Mag has a bullet with a diameter of .308” while the 7mm comes in about .284”. The 300 is more comfortable with slightly heavier bullets than the 7mm as well. What the 7mm does with a 140gr, the 300 will do with a 190gr. The 190 gr in .308 having a similar ballistic co-efficient to the 140gr in .284 will carry farther due to its weight advantage and will also be less susceptible to wind drift, making it somewhat more accurate.

As far as the cases are concerned, they are of similar dimensions and are both based on the old Holland and Holland 375 magnum. The .300 case is roughly 15% larger than the 7mm case so you can fit a bit more powder in there. I use a drop tube on a few of my loads where powder capacity is an issue and have no problem at all. Using DuPonts IMR4350 I have had no problems at all with volume and always get a complete and consistent burn.

I have had remarkable accuracy out of my Remington 700 BDL and if I must say, this is by far my favorite rifle of the many I own.

I have used 110gr varminter bullets, loaded to bit over 3600fps and they will virtually explode on anything they contact at that velocity, even once on a stiff breeze! They are devastating on prairie dogs and coyotes out to 500 yds. For larger game/longer distances the 165 thru 200gr are nice choices with the 190 and 200gr having some superb ballistic coefficients, and for the heaviest game the 220 round nose solids or soft points will break bone on anything I have seen, and we used to get some fairly large bears and many elk drifting through our back yard in the Jemez Mountains of northern New Mexico. If you want super heavy bullets you can get 300gr from Barnes but that is one long bullet and it will protrude into the case a bit. You can seat them out a bit but you better be sure about your magazine length and more importantly your freebore or you can run into some excessive pressures real quickly. Smoke a couple of bullets to insure they are not engaging the rifling before firing! This is important if you want to use these.

It is a bit heavy for varmint shooting as when shooting from a rest at a distant target, say 400-500yds, the size of a beer can, the rifle cannot be held too tightly and consequently it will put a thumping on you which gets old after about 30 or 40 rounds inside of an hour! That is when I break out my Savage in .223 Rem or even our Savage .22 mag or Ruger 22 lr, dependent on the range and the nature of the target and just coast, maybe crack a beer and a sandwich!

In any event I think it is obvious I prefer the .300 to the 7mm but they are pretty close in performance with the edge to the .300 winnie and when bear hunting, I’ll take all the edge I can get.