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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
50 bmg advise
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<blockquote data-quote="LouBoyd" data-source="post: 391214" data-attributes="member: 9253"><p>A 50 MOA base on any rifle is useful if the scope has at least +/- 50 MOA of vertical adjustment and you need to handle more than 50 MOA of drop. At it's maximum supersonic range a 50 BMG will likely have more than 50 MOA of drop, especially if shooting heavy alloy solids lke the Barnes 800s. A Leupold 16x40 scope is a good choice for a 50 BMG as it has 140 MOA of vertical adjustment. and could use a 50 MOA base. I have a 40 MOA base on mine allowing it to be used to 110 MOA of drop. On my heavy 50 that's about 2500 yards and transonic. I've not tried to shoot it at that range. </p><p></p><p>The A-Max bullet (and the Barnes 750 and 800) is likely to be too long to fit repeater magazines but should work in most single shots. </p><p></p><p>I have two very different 50 BMGs. One is a Pauza P50 Carbine (24" 5 shot semi-auto). It shoots standard 50 machine gun ammo from a 5 round magazine. At 25 Lbs it's fun to shoot offhand standing, but I can only do two shots rapid fire from the shoulder without losing balance. It's not fun to carry any significant distance. The recoil is not painful but the muzzle blast gets to my chest and sinuses with just a few shots. It's the best adrenaline generator I own. </p><p><a href="http://www.freshourmfg.com/gunbuild/p50/pauza.wmv" target="_blank">http://www.freshourmfg.com/gunbuild/p50/pauza.wmv</a></p><p></p><p>The other is a McBros "Johnson action" single shot with a 40" K&P barrel. Just the barreled action weights 50 pounds It has no brake. It's well supersonic at 2000 yards shooting 800 grain Barnes bore riders. Surplus ammo won't even chamber. Its muzzle velocity is only 2675 fps (90% SAAMI load) but it delivers over 3000 ft-lbs at 2000 yards with a drop of 71 MOA (200 yard zero). It's accuracy is wind and velocity dispersion limited but a 7mm STW will shoot that far with a lot less fuss. Its not much fun to shoot mostly because bullet holes aren't visible at 2000 yards. There's just too much to set up for shooting session. I built it for ballistics experiments about 15 years ago. </p><p></p><p>My recommendation for the OP? I think the LAR Grizzly "Big Boar" bullpup is a practical design. The trouble with most 50 BMG light rifles is that they're either too long and heavy to handle comfortably or they have short barrels and waste the performance of the cartridge. Rapid fire is not much of a virtue in a shoulder fired 50 BMG. Repeaters are faster but do you really want to carry the extra ammo in a magazine? </p><p><a href="http://www.largrizzly.com/web/guest/bigboar" target="_blank">largrizzly.com - Grizzly Big Boar</a></p><p><img src="http://www.largrizzly.com/image/image_gallery?uuid=9720319a-8d8b-4b9d-8266-48e1f462f752&groupId=10122&t=1225515795251" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>A long barrel makes more efficient use of the energy of the slow powder used in the 50 cartridges and reduces muzzle blast, which can easily be worse than the recoil. Pistol length 50 BMGs exist but they have low muzzle velocity. The muzzle brake can then use most of the propellant's momentum to make them nearly recoilless, but the muzzle blast is very unpleasant. ( I fired one shot from a Maadi Griffin pistol and I don't want one). The M2HB machine gun has a 45" barrel. I'd suggest 36" as a good tradeoff for a light (25-30lb)rifle You will want a brake on any 50BMG rifle unless it transfers it's momentum directly to the ground. (like the M2HB). Barrel life is about the same as for a 7mm Rem Mag but you're a lot less likely to shoot it enough to wear it out.</p></blockquote><p></p>
[QUOTE="LouBoyd, post: 391214, member: 9253"] A 50 MOA base on any rifle is useful if the scope has at least +/- 50 MOA of vertical adjustment and you need to handle more than 50 MOA of drop. At it's maximum supersonic range a 50 BMG will likely have more than 50 MOA of drop, especially if shooting heavy alloy solids lke the Barnes 800s. A Leupold 16x40 scope is a good choice for a 50 BMG as it has 140 MOA of vertical adjustment. and could use a 50 MOA base. I have a 40 MOA base on mine allowing it to be used to 110 MOA of drop. On my heavy 50 that's about 2500 yards and transonic. I've not tried to shoot it at that range. The A-Max bullet (and the Barnes 750 and 800) is likely to be too long to fit repeater magazines but should work in most single shots. I have two very different 50 BMGs. One is a Pauza P50 Carbine (24" 5 shot semi-auto). It shoots standard 50 machine gun ammo from a 5 round magazine. At 25 Lbs it's fun to shoot offhand standing, but I can only do two shots rapid fire from the shoulder without losing balance. It's not fun to carry any significant distance. The recoil is not painful but the muzzle blast gets to my chest and sinuses with just a few shots. It's the best adrenaline generator I own. [url]http://www.freshourmfg.com/gunbuild/p50/pauza.wmv[/url] The other is a McBros "Johnson action" single shot with a 40" K&P barrel. Just the barreled action weights 50 pounds It has no brake. It's well supersonic at 2000 yards shooting 800 grain Barnes bore riders. Surplus ammo won't even chamber. Its muzzle velocity is only 2675 fps (90% SAAMI load) but it delivers over 3000 ft-lbs at 2000 yards with a drop of 71 MOA (200 yard zero). It's accuracy is wind and velocity dispersion limited but a 7mm STW will shoot that far with a lot less fuss. Its not much fun to shoot mostly because bullet holes aren't visible at 2000 yards. There's just too much to set up for shooting session. I built it for ballistics experiments about 15 years ago. My recommendation for the OP? I think the LAR Grizzly "Big Boar" bullpup is a practical design. The trouble with most 50 BMG light rifles is that they're either too long and heavy to handle comfortably or they have short barrels and waste the performance of the cartridge. Rapid fire is not much of a virtue in a shoulder fired 50 BMG. Repeaters are faster but do you really want to carry the extra ammo in a magazine? [url=http://www.largrizzly.com/web/guest/bigboar]largrizzly.com - Grizzly Big Boar[/url] [IMG]http://www.largrizzly.com/image/image_gallery?uuid=9720319a-8d8b-4b9d-8266-48e1f462f752&groupId=10122&t=1225515795251[/IMG] A long barrel makes more efficient use of the energy of the slow powder used in the 50 cartridges and reduces muzzle blast, which can easily be worse than the recoil. Pistol length 50 BMGs exist but they have low muzzle velocity. The muzzle brake can then use most of the propellant's momentum to make them nearly recoilless, but the muzzle blast is very unpleasant. ( I fired one shot from a Maadi Griffin pistol and I don't want one). The M2HB machine gun has a 45" barrel. I'd suggest 36" as a good tradeoff for a light (25-30lb)rifle You will want a brake on any 50BMG rifle unless it transfers it's momentum directly to the ground. (like the M2HB). Barrel life is about the same as for a 7mm Rem Mag but you're a lot less likely to shoot it enough to wear it out. [/QUOTE]
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