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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
338 rcm
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<blockquote data-quote="AZShooter" data-source="post: 540707" data-attributes="member: 5219"><p>The 338 RCM is very interesting. Seeing I have two I will comment on them and hopefully add to this thread.</p><p></p><p>I first made a lightweight 338 RCM in an old M77 Tang safety Ruger. Pacific Tool and Gauge made me the exact spec reamer that Hornady uses. I know because I had a long chat with Lonnie at Hornady. </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> 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> The second rifle was just something I had to try. The long throated 338 RCM was something I was easily able to make as I already had the 338 RCM reamer. I had an ill fated 30" 1 in 7 twist 7mm barrel that Dan Pederson bored out to 338 then long throated (approx. .085 longer) to accomodate the 300 gr Sierra. Finished barrel length is 29", twist is 1 in 9.</p><p></p><p>I wanted to use the Berger 300 hybrid but it was under development to become the second generation. </p><p></p><p>300 gr sierra kissing rifling 57.5 gr RL-17/2540 fps accurate out to 500M fed 210 match primer</p><p>Finally the 300 gr hybrids came a few weeks ago. Finalized load 57 grs RL-17/2579 fps 210 match also</p><p>the most amazing part was the consistent velocities as well as the accuracy out to 500 M (longest distance at rifle range )</p><p>56 gr had all three test rounds reading 2524</p><p>57 gr had all three test rounds reading 2579 NO ES!!</p><p></p><p>The 29" barrel is in a Russo stock and weighs approx 14 lbs. I intend use it on a coues wt hunt this Nov.</p></blockquote><p></p>
[QUOTE="AZShooter, post: 540707, member: 5219"] The 338 RCM is very interesting. Seeing I have two I will comment on them and hopefully add to this thread. I first made a lightweight 338 RCM in an old M77 Tang safety Ruger. Pacific Tool and Gauge made me the exact spec reamer that Hornady uses. I know because I had a long chat with Lonnie at Hornady. 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 The second rifle was just something I had to try. The long throated 338 RCM was something I was easily able to make as I already had the 338 RCM reamer. I had an ill fated 30" 1 in 7 twist 7mm barrel that Dan Pederson bored out to 338 then long throated (approx. .085 longer) to accomodate the 300 gr Sierra. Finished barrel length is 29", twist is 1 in 9. I wanted to use the Berger 300 hybrid but it was under development to become the second generation. 300 gr sierra kissing rifling 57.5 gr RL-17/2540 fps accurate out to 500M fed 210 match primer Finally the 300 gr hybrids came a few weeks ago. Finalized load 57 grs RL-17/2579 fps 210 match also the most amazing part was the consistent velocities as well as the accuracy out to 500 M (longest distance at rifle range ) 56 gr had all three test rounds reading 2524 57 gr had all three test rounds reading 2579 NO ES!! The 29" barrel is in a Russo stock and weighs approx 14 lbs. I intend use it on a coues wt hunt this Nov. [/QUOTE]
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338 rcm
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