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I am dreaming about an African hunt for the big plains antelope. I will be using the Model 70 Winchester in 300 Win Mag. I hav

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  • I am dreaming about an African hunt for the big plains antelope. I will be using the Model 70 Winchester in 300 Win Mag. I hav

    I am dreaming about an African hunt for the big plains antelope. I will be using the Model 70 Winchester in 300 Win Mag. I have owned this gun since I was a teenager and I have experimented with a number of different bullets and loads over the last 40 plus years. The rifle loves a diet of 180 Speer Spitzer bullets with a fairly heavy load of IMR 4350. The African game require some special medicine and I believe the Swift A Frame in 180 gr is just the remedy. My question for all you reloading experts is... will the Swift bullet show signs of higher pressure than the Speer when using the same powder charge? Anybody out there had experience reloading these Swift bullets?

  • #2
    Kody, I have no idea which bullet would perform better... but I am with you in dreaming of Africa. I have always wanted to hunt on that continent. My dream hunt is cape buffalo, but I don't see that onen happening anytime soon.


    • #3
      I have't used Swift A Frame bullets. Some published data shows 61,000 psi for the speer bullet with 71 gr of IMR 4350, this is usually a safe load. I would drop a few grains off your current load and gradually work up to your current load while carefully checking for pressure signs. Every gun is different and one should not assume that bullet powder combinations from one rifle to the next.
      Good luck to you and I hope to enjoy such a trip shortly.


      • #4
        PAShooter, That is my load for the Speer bullet. I have a system for working up loads. I enjoy this process but find it frustrating to come up with a hot load leaving me with four more that I am unwilling to fire. So, using a Lee portable hand loader I put a sizing die set to seat that bullet 10/1000 off the rifling. I take a single bullet loaded to 69 gr along with primed cases, powder and scale, the hand loader and my bullets. If the 69 gr load shows no signs of pressure I load another round on the spot using 70 gr. and so forth. Any signs of pressure and I back off 1/2 gr and call it my ceiling for powder charge. Measuring and seating at the range saves the extra drives to and from. With this established load I fire three shot groups to check on accuracy. If the rounds are all over the target, I may back off another 1/2 gr and try again. If these powder variations do not have the desired effect I return to the ceiling load and experiment with varying the seating depth...give or take 5/1000. These are pretty expensive target loads so I would like to find the right load sooner rather than later. Otherwise, I will start counting pennies at every pull of the trigger. Regardless, I will not settle for less than an accurate load so I will get it right.
        Captain, I am having daydreams about kudu, sables and the like...I'm not sure that a Cape Buffalo fits into my wife's decorating style but a kudu and a few of his friends would fit in nicely. Yes, I will also take the .375 along as it would seem a crime not to give it a firing in Africa at least once. My old .300 Win gets the nod for most of the shooting.


        • #5
          Kody, sounds like you have a pretty good system to develop your loads. Good luck!




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