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Long Range Hunting & Shooting
.338 rcm
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<blockquote data-quote="AZShooter" data-source="post: 1193890" data-attributes="member: 5219"><p>I agree with J E Custom that this cartridge does its best in short action form with the 200-225 gr bullets. I have two 338 RCMs. The first one is a SA Ruger tang safety with a useable mag box of 3.050" The 225 accubond is very accurate and lethal on elk. I have taken 3 with this rifle. </p><p></p><p>While I know you want to use a Long Action here is my data on the sporter rifle:</p><p></p><p>The barrel is a 22" #2 Lilja SS 1 in 10 twist. </p><p></p><p>I originally used some 215 sierras I had hanging around. After break in tried some 180 ballistic tips. Ended up with finalized hunting load using the 225 accubond. Mag box was altered to approx 3.050". OAL with 225 accubond is 2.980" </p><p></p><p>225 accubonds: worked up to 61 gr of RL-17 / 2750 fps with Fed 210 match primer.</p><p>180 nosler bt: worked up to 64 gr of RL-17/ 3045 fps. 62 gr had same POI at 225s. </p><p>215 sierras: worked up to 55 gr of Varget, most accurate 54 gr/ 2730 fps. </p><p>215 sierras: worked up to 64 gr of H4350/ 2865 fps</p><p></p><p>As a lark I tried 300 gr sierras seated kissing the rifling, OAL was too long for magazine.</p><p>Much to my surprise during testing two touched at 200 yds with 57grs of RL-17/ 2450 fps</p><p></p><p>---------------------------------------------------------------------------------------------------</p><p></p><p>Now on to the Long Action: </p><p></p><p></p><p>First thing I would do is seat a bullet and see how it feeds. Then ask your gunsmith if he can lengthen the throat if you intend to shoot the 250s or longer. </p><p></p><p>Several years ago I used a LA Mark X action to build a long throated 338 RCM. I owned the reamer. I also had a used 30" 7 mm barrel. I sent everything to Dan Pederson and had him rebore/rerifle the barrel and install it on that action. I asked for a 1 in 9 twist. I had Dan lengthen the throat (approx. .085 longer) to accommodate the 300 gr Sierra. Finished barrel length is 29".</p><p></p><p></p><p>Some loads with 300 gr bullets:</p><p></p><p>300 gr sierra kissing rifling 57.5 gr RL-17/2540 fps. It is very accurate out to 500M. I use fed 210 match primer.</p><p></p><p>When the 300 gr hybrids arrived I switched. Finalized load 56.5 grs RL-17/2525 fps 210 match.</p><p>The most amazing part was the consistent velocities with some load testing with ZERO ES for 5 shots. </p><p></p><p>The 29" barrel is in a Russo stock and weighs approx 14 lbs. I used it one time and took a coues wt hunt at 425 yds.</p><p></p><p>If you do some number crunching you will see that the 300 gr with its high BC is quite a performer even at the mundane velocity of just over 2500 fps. Try the 250 gr bullet but also give the 300 Berger a try. </p><p></p><p>Hope this helps.</p></blockquote><p></p>
[QUOTE="AZShooter, post: 1193890, member: 5219"] I agree with J E Custom that this cartridge does its best in short action form with the 200-225 gr bullets. I have two 338 RCMs. The first one is a SA Ruger tang safety with a useable mag box of 3.050" The 225 accubond is very accurate and lethal on elk. I have taken 3 with this rifle. While I know you want to use a Long Action here is my data on the sporter rifle: The barrel is a 22" #2 Lilja SS 1 in 10 twist. I originally used some 215 sierras I had hanging around. After break in tried some 180 ballistic tips. Ended up with finalized hunting load using the 225 accubond. Mag box was altered to approx 3.050". OAL with 225 accubond is 2.980" 225 accubonds: worked up to 61 gr of RL-17 / 2750 fps with Fed 210 match primer. 180 nosler bt: worked up to 64 gr of RL-17/ 3045 fps. 62 gr had same POI at 225s. 215 sierras: worked up to 55 gr of Varget, most accurate 54 gr/ 2730 fps. 215 sierras: worked up to 64 gr of H4350/ 2865 fps As a lark I tried 300 gr sierras seated kissing the rifling, OAL was too long for magazine. Much to my surprise during testing two touched at 200 yds with 57grs of RL-17/ 2450 fps --------------------------------------------------------------------------------------------------- Now on to the Long Action: First thing I would do is seat a bullet and see how it feeds. Then ask your gunsmith if he can lengthen the throat if you intend to shoot the 250s or longer. Several years ago I used a LA Mark X action to build a long throated 338 RCM. I owned the reamer. I also had a used 30" 7 mm barrel. I sent everything to Dan Pederson and had him rebore/rerifle the barrel and install it on that action. I asked for a 1 in 9 twist. I had Dan lengthen the throat (approx. .085 longer) to accommodate the 300 gr Sierra. Finished barrel length is 29". Some loads with 300 gr bullets: 300 gr sierra kissing rifling 57.5 gr RL-17/2540 fps. It is very accurate out to 500M. I use fed 210 match primer. When the 300 gr hybrids arrived I switched. Finalized load 56.5 grs RL-17/2525 fps 210 match. The most amazing part was the consistent velocities with some load testing with ZERO ES for 5 shots. The 29" barrel is in a Russo stock and weighs approx 14 lbs. I used it one time and took a coues wt hunt at 425 yds. If you do some number crunching you will see that the 300 gr with its high BC is quite a performer even at the mundane velocity of just over 2500 fps. Try the 250 gr bullet but also give the 300 Berger a try. Hope this helps. [/QUOTE]
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