300 H&H Remington Rifle model 721

It is the parent cartridge of several modern magnums. Factory ammo is expensive and I don't recommend a newbie to reload it. It is headspace off the belt, which will need to be addressed at the web when resizing. I only use it with 190 SMK for precision shooting. My rifle is a modern R700 built by a custom rifle gunsmith. Randy Selby in WY. It is very accurate and extracts like butter. The rifle your son has is more of a collector piece. The 300 WM basically replaced it in the early 1960s rifle offerings, which is not that long ago in cartridge history.
 
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I have a 1950's vintage Remington 721 in 300 H&H mag in the safe right now. Got it on a trade last winter with dies and ammo. It is going as my main rifle for elk this year maybe even for Julie deer too. She shoots well. If he is going to sell it let me know I might need a back up.
 
Griffin & Howe .300 H&H Magnum single shot bull gun, engraved “Ben C. Comfort” with his 1935 Wimbledon Cup-winning score. Built on Remington 30-S Express action serial number 23063 (made in 1932 per Remington), Griffin & Howe rifle number 1415 was “likely” (per G&H Archivist) completed in 1935. (Repeated attempts to locate any G&H records for this rifle were unsuccessful).

According to the chapter “Ben Comfort’s Sighters” from the book “The National Matches – 1903-2003, The First 100 Years” published by the NRA’s Competitive Shooting Division (NRA is the sponsor of Camp Perry’s Wimbledon Cup), Comfort had “…only just received his custom-built rifle. He had no sighting data for 1,000 yards…“, this passage supporting the G&H Archivist’s assertion that the rifle was made/shipped in 1935. This same chapter states that Griffin & Howe indeed built Comfort’s rifle on a 1917 action (the Remington 30-S being visually similar to a 1917 without the rear sight “ears”), and that it was stocked by G&H’s Ernest Kerner. Also, the chapter cites a 1936 G&H ad that the barrel was 30-inches long and tapers from a diameter of 1.3 inches at the receiver to 1.0 inch at the muzzle. The barrel of this rifle is, indeed, 30 inches long and measures 1.241 inches at the receiver and .941 inch at the muzzle – the slight difference a likely result of finishing. It also reports that Comfort’s rifle was a single shot, as is the subject (the magazine box is plugged with a carefully-fitted walnut insert)
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