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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Building an interesting little 338 RCM
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<blockquote data-quote="AZShooter" data-source="post: 2523366" data-attributes="member: 5219"><p>Great minds think similarly. I already built a sporter weight 338 RCM and tried a Sierra 300 gr MK bullet in it. It was very accurate and it inspired me to make a long throated version on a LA.</p><p></p><p>This fired up an idea that came to fruition in 2011. I reported on it a while ago here on LRH. This is repeat:</p><p></p><p> I always thought a high BC bullet with that much weight from a smaller case using a small amount of powder would be able to fired repeatedly without excessive barrel wear and shouldn't heat up quickly yet perform down range with plenty of energy and minimal wind drift. Ended up making a second 338 RCM but had it long throated so the Sierra boattail/body junction was even with the case's shoulder/body junction and kiss the rifling. It is in a Joel Russo stocked Interarms Mark X. The barrel is a #5 lilja profile 30", 1 in 9 twist. I had Dan Pederson rebore/re-rifle this barrel which was originally an ill fated 1 in 7 twist 7mm lilja. This package shot the 300 gr sierra at 2520 fps with 57.5 gr of RL-17. </p><p></p><p>Then the 300 gr Berger OTM hybrid showed up! 56.5 gr of RL-17 vel 2550 fps shot very well out to 500 M where I tested it on several occasions. Recoil was not bad for a rifle weighing 14 lbs. Still using Fed 210 Match. It bucks the wind and has lots of energy down range. Recoil is very manageable. Heck even my 7 1/2 lb lightweight 338 RCM wasn't that bad with the 300s. It is a big push not snappy like a larger 338. </p><p></p><p>Used it for the first time on a coues wt deer. 400 yds impact vel 2244 fps and 3354 ft/lb of energy. Bedded deer was angled facing me. Shot behind shoulder exited between hind legs nicking rear most thigh by 1/2" . It got up and tried to walk downhill. It was moving towards the canyon bottom out of sight. I most likely would have toppled over but I put a second one through it when it offered a broadside shot. Aimed so it would pass behind the shoulders in and out which it did easily. That caused the deer to lie down and die. Neither bullet caused any excessively bloodshot meat just nice 338 cal entrance holes and 1/2" exits. I should have put the bullet into the leading shoulder, bet it wouldn't have caused much meat damage. You can bet I'll do that next time.</p></blockquote><p></p>
[QUOTE="AZShooter, post: 2523366, member: 5219"] Great minds think similarly. I already built a sporter weight 338 RCM and tried a Sierra 300 gr MK bullet in it. It was very accurate and it inspired me to make a long throated version on a LA. This fired up an idea that came to fruition in 2011. I reported on it a while ago here on LRH. This is repeat: I always thought a high BC bullet with that much weight from a smaller case using a small amount of powder would be able to fired repeatedly without excessive barrel wear and shouldn't heat up quickly yet perform down range with plenty of energy and minimal wind drift. Ended up making a second 338 RCM but had it long throated so the Sierra boattail/body junction was even with the case's shoulder/body junction and kiss the rifling. It is in a Joel Russo stocked Interarms Mark X. The barrel is a #5 lilja profile 30", 1 in 9 twist. I had Dan Pederson rebore/re-rifle this barrel which was originally an ill fated 1 in 7 twist 7mm lilja. This package shot the 300 gr sierra at 2520 fps with 57.5 gr of RL-17. Then the 300 gr Berger OTM hybrid showed up! 56.5 gr of RL-17 vel 2550 fps shot very well out to 500 M where I tested it on several occasions. Recoil was not bad for a rifle weighing 14 lbs. Still using Fed 210 Match. It bucks the wind and has lots of energy down range. Recoil is very manageable. Heck even my 7 1/2 lb lightweight 338 RCM wasn't that bad with the 300s. It is a big push not snappy like a larger 338. Used it for the first time on a coues wt deer. 400 yds impact vel 2244 fps and 3354 ft/lb of energy. Bedded deer was angled facing me. Shot behind shoulder exited between hind legs nicking rear most thigh by 1/2" . It got up and tried to walk downhill. It was moving towards the canyon bottom out of sight. I most likely would have toppled over but I put a second one through it when it offered a broadside shot. Aimed so it would pass behind the shoulders in and out which it did easily. That caused the deer to lie down and die. Neither bullet caused any excessively bloodshot meat just nice 338 cal entrance holes and 1/2" exits. I should have put the bullet into the leading shoulder, bet it wouldn't have caused much meat damage. You can bet I'll do that next time. [/QUOTE]
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